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Overheating Confusion

 
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Old 05-31-2010, 06:14 PM
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Overheating Confusion

I'll make this brief;

I've never owned this car through a summer, so I don't know if this was a pre-existing problem when I got the car of if I did something to effect it.

Temp gauge goes up when I'm stopped, when the car is at idle after I've driven it around a bit. It usually goes down when I start driving, and has never gone up while in motion. Before I had the coolant flush and temp sensor replaced, when I'd turn off the car and turn it back on, whether in motion or not, the gauge would return to normal (Two blocks/Half way).

1) I've replaced the thermostat with a 180 degree
2) I had a coolant flush done
3) I replaced the temperature sensor (Part No. SU4006 at Auto Zone)
4) I've tested the specific gravity of the coolant/water (3 balls floating, 2 not, ~60::40 coolant to water ratio)
5) I've ensured the fans come on properly
6) Done my best to make sure there's no air bubbles, but that consisted of no more than squeezing the upper and lower radiator hoses and letting them suck some more water back

and 7) As you all know, I've recently been through the hell of a timing belt issue, and through that process I replaced the water pump.


A bad new water pump is my only other idea..is there something else I could be lookin into? Or know of a way to actually test the water pump's functionality?
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Last edited by Lindso; 06-01-2010 at 04:39 PM.
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Old 05-31-2010, 08:28 PM
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Re: Overheating Confusion

hey bro ,if it was water pump it would make a lot of noise and you would also run the chance of breaking the timing belt and that would set you back a lot because that would bent your valves and mess up other stuff ,because of the the engine being interface ,is your timing set , my best guess would be make sure the coolant level is correct ,you said the head gasket was changed ,what cause the head gasket to be replace .Make sure that your heater core isn't clogged ,witch temp-sensor did you change the one under the distributor ,or the one on top of the thermostat and i believe there is another i don't remember but it's there , i believe there is one for the temp gauge,and then one fans,sorry don't remember the third .Hope this helps a little.
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Old 06-01-2010, 04:38 PM
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Re: Overheating Confusion

I didn't replace the head gasket. I'll put up a picture of the sensor I replaced in a moment.

It's 'getting hot" again today, but as soon as I turn the car off and right back on, the temp gauge shows normal so now I'm starting to wonder if it's a sensor-related issue.
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Old 06-01-2010, 04:50 PM
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Re: Overheating Confusion

okay what you can do is get and infa red digital temp gauge. aim it at you radiator hoses and it will tell you what your at. the other thing is get a autometer temp gauge. ties right into your stock sender on the side of the head. op temp is 180 to 210. anything above that .... you could have AIR POCKET. when you bleed the air out of the coolant when you first put it in after doing a waterpump or radiator or even thermostat.....it often developes an air pocket. on thing you can try.... run the car..... let the fans turn on .... then... open the bleeder ...it is a 12mm bleeder bolt ontop of the thermo housing under the stock coil location. if there is air in the system... opening the bleeder should help.... you will see air bubbles. if it pisses straight coolant..... then the air is out of the system. IF You actually get air coming out.... bleed it until nothing but straight coolant pisses out... shut the car down... let it cool then top off coolant through radiator. hope this helps.
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Old 06-01-2010, 06:47 PM
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Re: Overheating Confusion



The sensor I circled is the one I replaced-The ECT sensor is what the manual calls it I think (Engine Coolant Temperature Sensor).
What are the two that I put arrows to? And there's also a sensor looking thing near the thermostat-any idea what that is?

I'll try the bleeder valve suggestion when I can get something to put under the car. I've already spilled who-knows-how-many pints of coolant all over the place.

The IR temp reader is a $200-$300 piece of equipment so I'll have to get lucky and find someone with one.
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Old 06-02-2010, 03:03 AM
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Re: Overheating Confusion

1. Make sure to bleed your coolant system properly.
2. The thermostat is stock temperature setting right?
3. Buy a new radiator pressure cap. It's easy to overlook but they keep the system pressurized and functional. They're also cheap. Make sure it has the right numbers on it. Pretty sure its 1.1
4. Check your radiator. Clean it of any debris and make sure none of the fins are bent. This will reduce your ability to transfer heat. You can buy a fin straightener at advanced auto for like ten bucks.
5. Running the a/c puts more strain on the cooling system and reduces the systems ability to transfer heat from the engine. Does this happen while you're running the a/c? Also, the reason it doesn't overheat when the car is in motion is because wind is transferring heat from your radiator away from the engine. Usually if it only heats up when your stopped its because one or both of your fans isn't working.
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Old 06-02-2010, 03:25 PM
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Re: Overheating Confusion

It's sporadic at best- I can be driving around town for an hour and not have it heat up at stop lights even with the A/C on, and then all the sudden have it jump up one or 2 blocks. But I can turn the key off and right back on in less then 3 seconds and the temp gauge returns to normal.

Yes, it mainly happens when I'm stopped, not always when I have the A/C on, and rarely while I'm in motion.
-If I'm in motion, it will only go up 1 bar, and then return to normal itself.

I had the system flushed twice (my friend works at BrakeMasters so that helps), he ran a pressure test that checked out okay, and recommended a block pressure test (I dunno what that is).

The thermostat I put in is the 180 degree. Is it supposed to be 170?

The fans to work and come on accordingly. At BrakeMasters, we ran the car around to get the engine temp up and then let it idle for over 15minutes, but it never got hot while I was there.
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Old 06-02-2010, 03:33 PM
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Re: Overheating Confusion

I dunno the exact stock temp rating for thermostats but it needs to be to spec. Also it sounds more like a bad thermostat than an actual overheating problem.
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Old 06-02-2010, 04:16 PM
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Re: Overheating Confusion

Eff that sucks it's brand new.

I'll keep checking it. I don't think I'll know for sure until I get the actual temp checked out under the hood (I actually found a guy with frickin IR temp reader haha).


With regards to sensors and such.. John in the thread's first reply said there's 3 total, and I've replaced one of them. What and where are the other two? I wanna make sure I'm getting accurate readings on my HUD.
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Old 06-07-2010, 04:55 PM
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Re: Overheating Confusion

Where are the other sensors that control the temperature gauge and temp readings? I'm just gonna keep replacing stuff til I get to the radiator itself.
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Old 06-08-2010, 02:30 AM
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Re: Overheating Confusion

My H23 hated synthetic oil. car would over heat like your describing every time i tried to run it.
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Old 06-08-2010, 04:37 AM
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Re: Overheating Confusion

Interesting...I'm still at a loss, but I DO run semi-synthetic. 5W-30 Castrol. I will change this as well. In the meantime, see if you can figure this one out haha; This is a short video of what I mean by I restart the car and all is well..

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Old 06-10-2010, 03:30 PM
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Re: Overheating Confusion

okay sorry for the delay ,some time i don't log on , but the temp sensors are , on top of the thermostat witch is probably the bad one ,one on the front engine upper hose ,and one under the distributor,I don't have specifics but the one sensor located in on the front upper hose housing i believe controls certain point in road speed for fans to come on for adjustment coming from ecu signal.The other sensor is for the temp gauge ,i will try to be more informative because i don't have the specifics of the each sensor in hand .
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