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Car overheating


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joseph1357
Novice

Oct 20, 2016, 4:07 PM

Post #1 of 17 (760 views)
Car overheating Sign In

I have replaced head gasket, thermostat, water pump, and radiator.

No signs of any coolant leak.

Why would my car still be overheating?

I am at a loss

Thanks for any help


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Oct 20, 2016, 4:28 PM

Post #2 of 17 (756 views)
Re: Car overheating Sign In

Year, make, model, and engine size?

Does it overheat while driving, sitting at a light, or both?





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joseph1357
Novice

Oct 20, 2016, 4:57 PM

Post #3 of 17 (752 views)
Re: Car overheating Sign In

it is a 97 cavalier, not sure of engine size. it's dark and raining out or I would check. it overheats either way, but faster while driving.

was running without a thermostat, it did not overheat until I re installed a new one


Discretesignals
Ultimate Carjunky / Moderator
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Oct 20, 2016, 5:04 PM

Post #4 of 17 (749 views)
Re: Car overheating Sign In

Possible that the thermostat is installed backwards?

It either has the 2.2L or the 2.4L. If the water pump is driven by the serpentine belt, you have the 2.2L.

When you replaced the head gasket, did you send the head out to a machine shop to check for flatness or cracks?

Does the engine fan operate?





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joseph1357
Novice

Oct 20, 2016, 5:10 PM

Post #5 of 17 (747 views)
Re: Car overheating Sign In

it is a 2.2 then. pretty sure thermostat is in correctly. ( spring goes towards the engine)

didn't send the head out, checked flatness with a rule, it was good that way.

fan does run. I was having issues with it coming on, ran a bypass so it constantly runs while car is running


Discretesignals
Ultimate Carjunky / Moderator
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Oct 20, 2016, 5:14 PM

Post #6 of 17 (745 views)
Re: Car overheating Sign In

Does the heater work? If you have it bypassed, is the heater hoses hot when the engine is at operating temperature?

When it is running hot, is the air blowing out the cooling fan hot or cold?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Oct 20, 2016, 5:14 PM)


joseph1357
Novice

Oct 20, 2016, 5:16 PM

Post #7 of 17 (741 views)
Re: Car overheating Sign In

yes the heater works fine, haven't checked the air blowing from the cooling fan.


Discretesignals
Ultimate Carjunky / Moderator
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Oct 20, 2016, 5:17 PM

Post #8 of 17 (740 views)
Re: Car overheating Sign In

Does the heater still blow hot air when it is overheating?





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joseph1357
Novice

Oct 20, 2016, 5:20 PM

Post #9 of 17 (738 views)
Re: Car overheating Sign In

i believe so, not 100% on that. Why would it stop when overheating?


Discretesignals
Ultimate Carjunky / Moderator
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Oct 20, 2016, 5:26 PM

Post #10 of 17 (736 views)
Re: Car overheating Sign In

If you have air in the coolant system, the heater can stop working and the engine will overheat.

If the heater still blows hot hot air when the engine is running hot or overheating, feel the air coming from the radiator cooling fan. Also feel the radiator hoses. If one hose is hot and the other is cold, you have no flow going through the radiator. In that case, you should suspect maybe a defective thermostat or it was installed backwards.

If you have a hot heater and hot air blowing out of the radiator along with hot/warm radiator hoses, then maybe the engine isn't overheating and you need to check the operation of the gauge and sender.

One thing a lot of people overlook is the radiator cap. A faulty cap can cause the engine to overheat because the system can't pressurize itself to lower the boiling point of the coolant.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Oct 20, 2016, 5:30 PM)


joseph1357
Novice

Oct 20, 2016, 5:35 PM

Post #11 of 17 (731 views)
Re: Car overheating Sign In

thermostat should be installed with the spring side towards the engine, correct?

could the radiator that I installed be faulty?


Discretesignals
Ultimate Carjunky / Moderator
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Oct 20, 2016, 5:40 PM

Post #12 of 17 (728 views)
Re: Car overheating Sign In

Yes, spring towards engine.

It is possible the radiator could be faulty. Is this a new radiator you got from a parts store? If so, it would be unlikely the radiator is faulty, but you never know. If you can put your hand on the radiator when the engine is running hot, you shouldn't feel any cool spots on it.

Let us know what you find out about the temperature of the radiator hoses and if the air blowing from the fan is cold, warm, or hot.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Hammer Time
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Oct 20, 2016, 5:42 PM

Post #13 of 17 (727 views)
Re: Car overheating Sign In


Quote
didn't send the head out, checked flatness with a rule, it was good that way.


If you actually do have an overheating problem, that would likely be the reason but I'm guessing you don't have a problem at all. Youy stated the fan wouldn't come on so you wired it to run all the time. These fans aren't even programmed to come on until about 227 degrees which many people mistake for overheating but that is exactly what it is intended to do.



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joseph1357
Novice

Oct 20, 2016, 5:44 PM

Post #14 of 17 (724 views)
Re: Car overheating Sign In

i have done this, and it did feel cool


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Oct 20, 2016, 5:49 PM

Post #15 of 17 (721 views)
Re: Car overheating Sign In

What feels cool?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


joseph1357
Novice

Oct 20, 2016, 6:01 PM

Post #16 of 17 (718 views)
Re: Car overheating Sign In

the radiator, I did check this, didn't give any thought about the air from the fan.


I believe the hose from the from the thermostat was cooler than the other also


Tom Greenleaf
Ultimate Carjunky / Moderator
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Oct 21, 2016, 2:51 AM

Post #17 of 17 (705 views)
Re: Car overheating Sign In

Just a note and I'm out. Head was never sent out! Engine was run without a thermostat - big mistake. When so, coolant just goes round and round to radiator wildly overheating points far away -opposite end of engine from thermostat - warped or cracked engine parts highly possible mess you all up. Thermostat being out will show engine is running cold but not true and worse metal want to be all a uniform temp and wasn't,


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