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Over Heating Fans Only Come on after car is off

 
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Old 08-19-2015, 02:44 PM
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Over Heating Fans Only Come on after car is off

Hello, I am back with yet another problem. A few months ago I found out I had a blown head gasket and messed up cylinder head and finally got it back from the shop today. The overheating actually started the day after I found out about the cylinder head so I was hoping that it was from the exhaust gas being pushed into the coolant.

So fast forward to today, I got the car from the shop and everything was fine except the check engine light was on, I figured it was probably because they didnt connect my temp sensor right and I was right plugged it back in right and then drove home no check engine light. The sensors dont have the regular green plugs because the guy i bought it from broke them off for some reason.

Anyways when i got home I decided to let it idel for a bit to make sure it took care of the overheating issue, but sadly it did not. What is happening is I will let the car idle for about 20 minutes from being completely cooled off and it will start to overheat (I wont let it go above one bar before turning off the I dont want the cylinder head to get warped right after getting it fixed) car but the fan is not switching on before that. Right after I turn the car off though it switches on and runs for about 10 minutes or so before turning off.

I checked the fuses and the ones for the radiator fan and condenser fan both are good, I checked the relay and even tried switching just to be safe. There is a third wire that has a similar green connector as the two temperature sensors should have but there is nothing for it to plug into, if I stick a paper clip in this while the car is on it makes both fans come on and run non stop but the wire is to short to reach anywhere near the two sensors. (The mechanics solution to fix the fans not coming on was to extend this wire and just plug it in to the sensor under my distributor apperently, but that is what cause the check engine light. and running the fans 100% of the time probably is a bad idea right?)

I have two tempeture sensors on my engine (F22a1) One is under the distributor and one is right next to the upper radiator hose. I tried jumping the cables with the car off and the one next to the radiator hose makes the fan switch on, but when I try with the car on it does do anything. So I tried both on and off with the cable to the one under the distributor and nothing either time. Which tempeture sensor controls the fans while the car is running? Any suggestions for what to try to fix this? Its driving me crazy, I just spent $1500 getting the head fixed and I still cant drive it!

I have read other threads but the few that have solutions don't appear to be my problem, so sorry for posting yet another overheating thread but I really need help. I have put to much money into this car to just give up on it.
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Old 08-20-2015, 12:11 PM
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Re: Over Heating Fans Only Come on after car is off

Until you get it sorted out just straightwire from fan to an on/off switch. Then you can use fans at your discretion.
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welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
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Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
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I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

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Old 08-20-2015, 02:54 PM
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Re: Over Heating Fans Only Come on after car is off

Yeah I have an switch already laying around so I was thinking of just doing that figure it won't hurt to just flip it on at red lights much, still would rather figure out a real fix eventually. I saw some people mention the fan timer unit could be messed up in another thread since jumping the wire doesn't turn on the fan but its coming on when car is off meaning the under dash relay is good so I bought one hopefully it's that will update if I that fixes it, will be a few days before I get it here though.
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Old 08-20-2015, 04:05 PM
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Re: Over Heating Fans Only Come on after car is off

That timer box does some funky stuff.
It goes through your clock too. So if your clock has issues...
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Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 08-20-2015, 04:42 PM
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Re: Over Heating Fans Only Come on after car is off

Not sure if the clock is messed up, I forget it's there sometimes lol. I do know I accidentally pulled the clock/ecu fuse put once to do a reset right before this started with the key set to on once, forgot it was in there. Maybe it shorted the part of the timer that controls running fans? We will see guess for now I throw the cheaper parts at it and cross my fingers each time hoping it fixes it. Really can't afford another mechanic right now and the ones who did the head obviously don't understand the wiring if the told me the fixed it by plugging in the wrong plug.
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Old 08-20-2015, 07:06 PM
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Re: Over Heating Fans Only Come on after car is off

The service manual should clear up some questions you may have.

All Gen. Prelude Service Manuals

There's a trouble shoot manual at helm .com for (I think) $50, but you may find as used one on fleabay or something...
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Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 08-21-2015, 02:00 PM
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Re: Over Heating Fans Only Come on after car is off

Recheck all wire connections to both ect switches- check relay in under hood fuse box- replace fan timer box (located next to ecu)- these boxes have a tendency to corrode, short out, & fail over time. When i pulled a replacement from the yard i found two extra boxes in the donor car that had been left by previous owner who had obviously experienced similar problems. - my $.02
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Old 08-21-2015, 07:30 PM
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Re: Over Heating Fans Only Come on after car is off

Ok so just gonna go ahead and assume that its definitely something electrical going wrong somewhere because I was driving it around trying to see if it overheats while actually moving or just at idle for sure and out of nowhere all the lights on my dash went out and the spedomoter and tachometer stopped working completely. my radio still works the headlights work the blinkers work the heater works and I can start the car after shutting it off but nothing on the dash will come on now. I love my prelude but seriously this thing drives me crazy!!! Who would I even take it to figure this out, will a basic mechanic shop know what to do or are there specialist electricians for this kind of thing?
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Old 08-21-2015, 11:39 PM
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Re: Over Heating Fans Only Come on after car is off

^^ that's something a few phone can answer.
You have general parts swappers, diagnosticians and specialists but in your area you'd have to ask around to see who does what.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 08-28-2015, 06:08 PM
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Re: Over Heating Fans Only Come on after car is off

alright back, I figured out the gauges it was the meter fuse which was blow but for some reason still testing good. back to the overheating I was bleeding the air out of the system using one of those big bucket type funnels and the whole time the temp gauge was going from 1 bar to two bars back and forth for almost 15 minutes at which point it finally stayed steady at 2 bars and then after about 5 more minutes the coolant in the bucket started boiling like crazy flying up all over the engine. The temp gauge never read over half way though and the fans didnt kick on after i turned the car off like they normally do when its overheating. Thoughts? I am pretty sure I wont be able to figure this out myself and am already saving to get my car into a shop as soon as possible but I figured it couldnt hurt to see if anyone has any ideas in the mean time.
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Old 08-29-2015, 11:35 AM
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Re: Over Heating Fans Only Come on after car is off

I was testing to see if the gauges were going to blow again today and drove around my neighborhood for 15 minutes going around 30 mph and never overheated then when I got home I jumped out to check the fans since I changed the control unit and redid the wires to the ect switch but it still started going up in temp after a couple minutes at idle so I shut it off and noticed that all along the plastic part of the top of my radiator was gurgling and coolant was boiling out of where the metal meets the plastic. is it possible the fans would not come on because of this? Also my brother said the fans could be a bad ecu but wouldnt that most likely turn on the check engine light if something was wrong with that?
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Old 08-29-2015, 02:16 PM
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Re: Over Heating Fans Only Come on after car is off

Once upon a time my 3g car had fan issues.
Daunted I took it to an ace mechanic who worked on it a couple hours at a time for 3 weeks.
He started out thinking it would be simple. I warned him that if it was simple I wouldn't have brought it to him.

Turns out the temp sensor, a fan motor and a timer box were all working intermitantly. Each time he did a test or a jumper nothing showed up bad. Well one day all 3 quit at the same time.

The CEL is to tell you when something is going on that affects the pollution the car puts out, not anything going wrong. So it probably won't light because your fans don't work...yet if boiling water clogs your cat...yeah then it'll light up.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 08-31-2015, 01:10 AM
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Re: Over Heating Fans Only Come on after car is off

Quote:
Originally Posted by bykfixer View Post
Once upon a time my 3g car had fan issues.
Daunted I took it to an ace mechanic who worked on it a couple hours at a time for 3 weeks.
He started out thinking it would be simple. I warned him that if it was simple I wouldn't have brought it to him.

Turns out the temp sensor, a fan motor and a timer box were all working intermitantly. Each time he did a test or a jumper nothing showed up bad. Well one day all 3 quit at the same time.

The CEL is to tell you when something is going on that affects the pollution the car puts out, not anything going wrong. So it probably won't light because your fans don't work...yet if boiling water clogs your cat...yeah then it'll light up.
I have a problem with my 4th gen where the gauge will start to read hot once the cooling fan turns on, then return to normal once the cooling fan turns off and will repeat, this started to happen with my old engine, this is a newer engine with a new rad, water pump, oem thermostat, new sender, new thermo switch, and it still overheats, the coolant has been bled also.
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