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  #1 (permalink)  
Old 03-05-2012, 04:34 PM
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Weird overheating problem

Hi all
I have this weird overheating problem
mostly at idle but lately even when im driving,car well start overheating .
I notice that the lower hose is very cold so i replace the thermostat.it was fine for a month until it start overheating again this time even while im cruising.
Check the lower hose it cold again very weird
So i warrantied that one,Still doing the same thing. Weird
I tested my old thermostat and it will start to open around 86*c and fully open by 90*c so my old thermostat is actually working

my fan hasnt been working also i put 3 diff used thermoswitch still wont turn on so i tap a switch in and it helps a little bit.

So heres the weird part
Like i said earlier while im driving car will overheat and the lower hose is cold meanin thermostat is not opening
But when i shut the car off after i few minutes hose is starting to get warm meanin thermo stat is opening.
Has anyone encounter this problem before

I also notice the my coolant resevoir will overflow and keeps getting higher above maximum

Hope You u guys can help me
Ty in advance
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Old 03-05-2012, 04:48 PM
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Re: Weird overheating problem

When you changed the thermostat did you bleed the system to get all the air out ?
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Old 03-05-2012, 04:49 PM
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Re: Weird overheating problem

Hmmmmm berrryyyy interesttinggggg


you sure the gauge isn't malfunctioning?
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Old 03-05-2012, 04:54 PM
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Re: Weird overheating problem

Yes bleed it countless times bro

I have two temp gauge tried both
Could it b the ect sensor.
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Old 03-05-2012, 05:03 PM
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Re: Weird overheating problem

Quote:
Originally Posted by jackp0t View Post
my fan hasnt been working also i put 3 diff used thermoswitch still wont turn on so i tap a switch in and it helps a little bit.

Ahhh I just saw this. That's your main problem, the fan not coming on. I forget which switch tells the fan to come on, I'll look it up when I get home from work.
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But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 03-05-2012, 05:15 PM
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Re: Weird overheating problem

Fan Relay or Coolant temp sensor maybe ? I had this issue a while back with my teggy.
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Old 03-05-2012, 05:32 PM
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Re: Weird overheating problem

I'll tell you exactly what it is -


your radiator.

The reason is your water pump keeps drawing the hot cooling and trying to push it through the t-stat into the top of your radiator - though the coolant system isn't quite a "Vacuum" type system, it basically is. Some mechanics even refer to it as such (since the vacuum from being low on coolant will draw from your reservoir as well- so yea I guess mildly a vacuum system) Since your rad is clogged it can't do it. Now, once you turn the car off the water pump stops turning and the hot coolant inside the motor rushes back down through the bottom hose.

Do this:
Open the rad cap with car off preferably. Make sure there is enough coolant that you can see the level. Open lower rad hose (with a bucket underneath) if no coolant drains out, bingo, there is your problem.

Cooling system is cake, it could realistically only be one of a few problems...
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Last edited by Smok3y; 03-05-2012 at 08:26 PM. Reason: changed an incorrect word
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Old 03-05-2012, 05:44 PM
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Re: Weird overheating problem

theres so many things it could be man.. a bad ground even can fluctuate the temp gauge if you wanna see it over heat in action try taking the ground where it goes from the radiator support by the passenger headlight to the battery off. gurantee it will say your car is overheating. but in reality it isn't. so it could in fact be your coolant temp sensor, or bad ground, fan switch, etc. just start with the basics (even thoe you already have but re-check all your steps. check all fuses, let car idle until fan is confirmed coming on, take new thermostat out and set it in boiling water on the stove and see if it opens up at around 185 degrees. and when its at 215 degrees it should be completley open if it isnt opened at this point it is deffinitly a faulty thermostat. and then from there just re-check all your valve cover grounds, main grounds, etc. also many times your radiator it self can be vaporlocked which the air bubbles are trapped inside the radiator and cannot get to the highest point of the flow of coolant (typically where the bleeder valve is) so alot of times letting it idle with the radiator cap off and spuradically hitting the gas pedal around 3-4k rpms several times will also knock the air bubble to the top of the radiator or to the bleeder valve... hope i helped man (just cross your fingers on a good water pump ;)
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Old 03-05-2012, 07:45 PM
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Re: Weird overheating problem

Quote:
Originally Posted by twokexlv6coupe View Post
Ahhh I just saw this. That's your main problem, the fan not coming on. I forget which switch tells the fan to come on, I'll look it up when I get home from work.
its the switch by themostat i replaced that 3 times fan still wont come on
so i splice a manual switch instead so fan is not a problem anymore
Quote:
Originally Posted by HueyTat View Post
Fan Relay or Coolant temp sensor maybe ? I had this issue a while back with my teggy.
relay is good . i dont now bout the colant temp sensor
Quote:
Originally Posted by HpreludeH View Post
theres so many things it could be man.. a bad ground even can fluctuate the temp gauge if you wanna see it over heat in action try taking the ground where it goes from the radiator support by the passenger headlight to the battery off. gurantee it will say your car is overheating. but in reality it isn't. so it could in fact be your coolant temp sensor, or bad ground, fan switch, etc. just start with the basics (even thoe you already have but re-check all your steps. check all fuses, let car idle until fan is confirmed coming on, take new thermostat out and set it in boiling water on the stove and see if it opens up at around 185 degrees. and when its at 215 degrees it should be completley open if it isnt opened at this point it is deffinitly a faulty thermostat. and then from there just re-check all your valve cover grounds, main grounds, etc. also many times your radiator it self can be vaporlocked which the air bubbles are trapped inside the radiator and cannot get to the highest point of the flow of coolant (typically where the bleeder valve is) so alot of times letting it idle with the radiator cap off and spuradically hitting the gas pedal around 3-4k rpms several times will also knock the air bubble to the top of the radiator or to the bleeder valve... hope i helped man (just cross your fingers on a good water pump ;)
thank bro waterpump been replace when i did my swap last year, thermostat replace last week havent check this yet but i checked my old one and it was actually working fine.
thermo switch been replace 3 times, fan timer module once
as for the ground i believe its good bc i grounded my vtec in the same spot and i hit vtec everytime so ground should be good
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Old 03-05-2012, 07:47 PM
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Re: Weird overheating problem

Quote:
Originally Posted by Smok3y View Post
I'll tell you exactly what it is -


your radiator.

The reason is your water pump keeps drawing the hot cooling and trying to push it through the t-stat into the top of your motor - though the coolant system isn't quite a "Vacuum" type system, it basically is. Some mechanics even refer to it as such (since the vacuum from being low on coolant will draw from your reservoir as well- so yea I guess mildly a vacuum system) Since your rad is clogged it can't do it. Now, once you turn the car off the water pump stops turning and the hot coolant inside the motor rushes back down through the bottom hose.

Do this:
Open the rad cap with car off preferably. Make sure there is enough coolant that you can see the level. Open lower rad hose (with a bucket underneath) if no coolant drains out, bingo, there is your problem.

Cooling system is cake, it could realistically only be one of a few problems...
oh wow this is good i will try this bro
i really hope its the rad bc that the only one i havent replace since i got the car 2 years ago.
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Old 03-05-2012, 08:28 PM
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Re: Weird overheating problem

Also be aware that some coolant may drain out from UNDER the point of the rad being clogged. There will be some in there. That's why I said just make sure you can see the level up top, this way you can see if it is clogged.

It may cost you a few qt's of antifreeze but it may save you a coupla dollars elsewhere.
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Old 03-05-2012, 09:52 PM
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Re: Weird overheating problem

+1 on the radiator being clogged .. ill bet money the rad will fix it ..
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Old 03-05-2012, 11:38 PM
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Re: Weird overheating problem

Quote:
Originally Posted by Smok3y View Post
Also be aware that some coolant may drain out from UNDER the point of the rad being clogged. There will be some in there. That's why I said just make sure you can see the level up top, this way you can see if it is clogged.

It may cost you a few qt's of antifreeze but it may save you a coupla dollars elsewhere.
Quote:
Originally Posted by element600rr View Post
+1 on the radiator being clogged .. ill bet money the rad will fix it ..
danm i dont think its the rad
i pulled it out and ran water to make sure


while theres no coolant might as well take out the thermostat and test it out

new thermo starts top open at 86*c


same as the old thermo


and then new thermo fully open at 90*c


also the old one


but i notice i put the thermostat gasket backwards so ill find out tomorrow if that help.lol

im gonna try to go to the junkyard to find some ect sensor
are the 5thgen and 4th gen the same for the ect sensor if i got the h23vtec motor??
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Old 03-06-2012, 03:07 AM
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Re: Weird overheating problem

I've literally done everything and replaced everything I could think of trying to pin down my overheating issue, which I ultimately gave up on.

-Removed the radiator and flushed it
-Coolant flush x2
-40/60 coolant to water ratio
-New thermostat to 180 degree
-New ECT sensor
-New ECT sending unit
-Different ECU
-New (used) stock gas/temp gauge cluster
-Bled of air each time I changed something
-New radiator cap
-System pressure test (Held PSI steadily)
-Fans kick on normally, not necessarily when the readout is hot.
-Probably a few other things

-Problem was: Heat goes up randomly and will remain 'hot' as I drive or idle, but turning the car off and right back on resets the temp gauge to only 2 blocks, and it remained normal from there for anywhere between 2-30min.

So I bought an aftermarket analog gauge that I'm running straight from the stock ECT sending unit, bypassing the ECU (Does the stock gauge even run through the ECU?), but I ran into problems with that too, kinda. When I turn the car on and run it, it goes to 230 degrees and stays pretty steadily around there, so that seems to be the 'norm'. During this time, the stock gauge rises according to how long I leave the car on, so it seems to be functioning properly as well, and with this 2nd gauge running off the same sensor, the stock gauge remains at 1-2 blocks of heat, instead of just 2. I'm wondering if the sensor itself doesn't have enough voltage traveling through it to be able to handle these two sources. Could that be a valid issue? Because both gauges draw their own power separately from the sensor, but not having a reference for this problem has left me to pioneer it on my own. It's been probably about a year and I haven't tried disconnected this 2nd gauge, but I probably should. I never figured out the original problem though.

How do you have your second gauge hooked up?
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Old 03-06-2012, 12:21 PM
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Re: Weird overheating problem

Do you see the little jiggle valve on the t stat? That must be at the 12 o clock position in the houising. It allows air to travel through when you bleed the system. If that isn't where its.supposed to be, you'll have problems. Usually you align it with the notch the gasket sits in. If there isn't a notch just put it straight up. Bleed the system and drive.
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Old 03-06-2012, 12:23 PM
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Re: Weird overheating problem

http://0.tqn.com/d/autorepair/1/0/i/4/82097120.gif

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Old 03-06-2012, 01:32 PM
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Re: Weird overheating problem

What color was the coolant? I'm really hoping it's not your water pump. It just doesn't make sense that the lower hose is cold and the top is hot if your pump is shot. I'm with neck (twokexlv6) about getting that fan fixed asap. Still leaves me boggled though. Really it could only be one of a few things. I think your tstat is about last on the list though.

So just to get this straight, the radiator drained all the way? As crazy as this sounds, fill up your rad and pull the top hose without the tstat in. This way you can see if the water is circulating throughout the whole system. If it is, it doesn't make sense why that bottom hose was cold, it would have meant that the system was circulating the whole time.
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89 EB Edition Bronco - 6" RC Lift, 35" KO's, 302/c6 swap, Ford 9"
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Old 03-06-2012, 04:57 PM
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Re: Weird overheating problem

Quote:
Originally Posted by Lindso View Post
I've literally done everything and replaced everything I could think of trying to pin down my overheating issue, which I ultimately gave up on.

-Removed the radiator and flushed it
-Coolant flush x2
-40/60 coolant to water ratio
-New thermostat to 180 degree
-New ECT sensor
-New ECT sending unit
-Different ECU
-New (used) stock gas/temp gauge cluster
-Bled of air each time I changed something
-New radiator cap
-System pressure test (Held PSI steadily)
-Fans kick on normally, not necessarily when the readout is hot.
-Probably a few other things

-Problem was: Heat goes up randomly and will remain 'hot' as I drive or idle, but turning the car off and right back on resets the temp gauge to only 2 blocks, and it remained normal from there for anywhere between 2-30min.

So I bought an aftermarket analog gauge that I'm running straight from the stock ECT sending unit, bypassing the ECU (Does the stock gauge even run through the ECU?), but I ran into problems with that too, kinda. When I turn the car on and run it, it goes to 230 degrees and stays pretty steadily around there, so that seems to be the 'norm'. During this time, the stock gauge rises according to how long I leave the car on, so it seems to be functioning properly as well, and with this 2nd gauge running off the same sensor, the stock gauge remains at 1-2 blocks of heat, instead of just 2. I'm wondering if the sensor itself doesn't have enough voltage traveling through it to be able to handle these two sources. Could that be a valid issue? Because both gauges draw their own power separately from the sensor, but not having a reference for this problem has left me to pioneer it on my own. It's been probably about a year and I haven't tried disconnected this 2nd gauge, but I probably should. I never figured out the original problem though.

How do you have your second gauge hooked up?
hey bro i dont have a 2nd gauge.
but i did most of the one on your list .
im afraid even tho i replace my waterpump last year.it could be it.
Quote:
Originally Posted by blaclabel1911 View Post
Do you see the little jiggle valve on the t stat? That must be at the 12 o clock position in the houising. It allows air to travel through when you bleed the system. If that isn't where its.supposed to be, you'll have problems. Usually you align it with the notch the gasket sits in. If there isn't a notch just put it straight up. Bleed the system and drive.
yes im aware of this bro.
Quote:
Originally Posted by Smok3y View Post
What color was the coolant? I'm really hoping it's not your water pump. It just doesn't make sense that the lower hose is cold and the top is hot if your pump is shot. I'm with neck (twokexlv6) about getting that fan fixed asap. Still leaves me boggled though. Really it could only be one of a few things. I think your tstat is about last on the list though.

So just to get this straight, the radiator drained all the way? As crazy as this sounds, fill up your rad and pull the top hose without the tstat in. This way you can see if the water is circulating throughout the whole system. If it is, it doesn't make sense why that bottom hose was cold, it would have meant that the system was circulating the whole time.
the coolant is green and the flow is very consistent. that will be the next one im gonna try to make sure that the coolant is actually circulating.

its weird bc i replace the waterpump last year when i did the swap

on the plus note
today was very sunny and 6*c and it only happen ones the temp gauge went to 4 bars but very briefly and until now it stays at 3 bars.

im very positive when i shut off the car thermostat opens up .lol
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Old 03-06-2012, 06:07 PM
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Re: Weird overheating problem

weather your vtec engages with a good ground or not my vtec engaged just fine but my temp gauge still said i was over heating lol. and of coarse in reality it wqasnt over heating bc when hooked up to a laptop it was at 185 degrees but the gauge said i was bout to blow lol. just letting you know man make sure your fan cuts on continuosly as well, and also dont rule out the water pump because you replaced it last year i replaced mine this previous summer and had my swap done the summer before that... just saying and yess i replaced the timing belt and water pump b4 the swap

and also lets rule out the thermostat as a possibility and also the radiator at this point as long as the radiator is holding preasure and has no leaks then its alright. assuming coolant is completely filled with 50/50 coolant. that leaves us with the coolant temp sensor,the fan, fan switch, air bubbles its self, the gauge cluster, and also the water pump its self and just to be on the safe side check all the fuses to the fan (if the fan is not operating) first thing first lets figure out why the fan is not coming on. jus tlet your car sit idleing until that fan comes on, let it turn off, then once again cut on and turn off. if all this happens without overheating then you know the fan is deffinitly doing its job
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Old 03-06-2012, 06:22 PM
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Re: Weird overheating problem

Your car ****ing hates you. Sorry.
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Old 03-06-2012, 10:45 PM
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Re: Weird overheating problem

Quote:
Originally Posted by blaclabel1911 View Post
Your car ****ing hates you. Sorry.
lmao!.i still love her
Quote:
Originally Posted by HpreludeH View Post
weather your vtec engages with a good ground or not my vtec engaged just fine but my temp gauge still said i was over heating lol. and of coarse in reality it wqasnt over heating bc when hooked up to a laptop it was at 185 degrees but the gauge said i was bout to blow lol. just letting you know man make sure your fan cuts on continuosly as well, and also dont rule out the water pump because you replaced it last year i replaced mine this previous summer and had my swap done the summer before that... just saying and yess i replaced the timing belt and water pump b4 the swap

and also lets rule out the thermostat as a possibility and also the radiator at this point as long as the radiator is holding preasure and has no leaks then its alright. assuming coolant is completely filled with 50/50 coolant. that leaves us with the coolant temp sensor,the fan, fan switch, air bubbles its self, the gauge cluster, and also the water pump its self and just to be on the safe side check all the fuses to the fan (if the fan is not operating) first thing first lets figure out why the fan is not coming on. jus tlet your car sit idleing until that fan comes on, let it turn off, then once again cut on and turn off. if all this happens without overheating then you know the fan is deffinitly doing its job
regarding the fan i put a manual switch so i can turn the fan on and off .
yah im definitely not ruling out the water pump bro i will be taking out the thermostat and run the car too see if its circulating this will tell me if the waterpump still working.

did you ever solve your problem bro??

today the funnything after puting the gasket properly for the thermostat
i didnt overheat today and it was very sunny.
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Old 03-06-2012, 10:50 PM
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Re: Weird overheating problem

side note:
im actually changing my headgasket
main reason is its leaking oil externally between the head/block not alot but really slow.
another reason is im actually loosing coolant and i can smell it through the tail pipe BUT
the weird part is i did a leak down test its holding pressure it shouldnt if the headgasket is shot right..
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Old 03-14-2012, 12:02 AM
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Re: Weird overheating problem

UPDATE:

i drilled holes on the thermostat and havent overheated ever since, well its only been 1 day(cross finger).lmao

i know this is a temporary fix until the headgasket/arp studs i order arrives but im happy i was able to stop the overheating for now.

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Old 06-20-2013, 10:58 AM
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Re: Weird overheating problem

Damnnn i think i've the seem problem!!

Allready New update to this??



Also have every part replace! And my coolant hose is also cold and on the top hot!!
And also my fans not working!!
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