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Overheating and can't find the cause

 
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  #1 (permalink)  
Old 04 Jul 2018, 10:36 am
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Location: Twin Cities, MN
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Default Overheating and can't find the cause

Our '02, 2.4 PT has been overheating for a while. The temperature gauge will go up until the temp light turns on, then it goes right back down to normal. Many days, we will drive 25 miles with zero problems. The next day, it occurs occasionally. This has occurred in below zero temps and 100 degree temps outside. We've had it in at a Chrysler dealer and they couldn't solve it either. Could the ECM be the culprit?

So far, we've changed:
Radiator
Radiator fan
Radiator cap
Coolant (correct HOAT on schedule for many years)
Temperature sensor
Hoses

We get plenty of heat so we have adequate flow. I just can't figure out why the car will go great for days, then out of nowhere, act like it's overheating. It does this at low and high speeds. Oil looks fine and otherwise, it runs great.

Have any of you experience this same issue?
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Old 04 Jul 2018, 11:06 am
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Default Re: Overheating and can't find the cause

Does the engine light come on? If so what codes?

Has the thermostat been replaced. Every time you overheat the engine the thermostat can be damaged and not working properly.

When the dealer looked at it did they do a block test? Sometimes you can have a small crack in the cylinder head that randomly causes the temperature to rise.
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Old 04 Jul 2018, 11:17 am
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Default Re: Overheating and can't find the cause

Thanks for the reply. The engine light never comes on when it overheats. The dealer did a pressure test and no issues were discovered. Their only thought was that an air pocket was there, which they solved. However, it overheated five minutes after I left the dealer. They couldn't figure it out afterwards.

We always pull over when the temperature rises but the odd thing is that it always drops back down quickly.

I have changed the thermostat a few times but have not done so for two months.
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Old 04 Jul 2018, 11:26 am
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Default Re: Overheating and can't find the cause

Does it only overheat at high speeds or low speeds or both?

It's important to know if the dealer did the block test.
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Old 04 Jul 2018, 11:46 am
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Location: Twin Cities, MN
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Default Re: Overheating and can't find the cause

Previously, it only overheated at high speeds. Now, it occurs at any speed, randomly.

Yes, the dealer was thorough and described no engine cracks or gasket leaks.

ECM? I'm running out of ideas with this car. It makes no sense the randomness.

Thanks again!
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Old 04 Jul 2018, 12:04 pm
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Default Re: Overheating and can't find the cause

Have you physically checked the engine coolant temperature with a infrared temperature thermometer when it overheats?

https://www.ebay.com/itm/IR-Laser-Ni...item1c417d410b
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Old 04 Jul 2018, 07:20 pm
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Default Re: Overheating and can't find the cause

No, that is one thing I have not tried. I will find one of these and try that.

Thanks!
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Old 04 Jul 2018, 08:03 pm
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Default Re: Overheating and can't find the cause

Also check both upper and lower radiator hoses when you do it.
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Old 04 Jul 2018, 08:45 pm
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Default Re: Overheating and can't find the cause

I had someone change out the hoses a few months back and noticed the bottom hose does not feel rigid. It feels as if there is no spring in there. Do these usually have a spring in the bottom radiator hose for stability?
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Old 08 Jul 2018, 11:14 am
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Default Re: Overheating and can't find the cause

Okay, after breaking the bleeder valve and changing out the lower thermostat housing, I discovered that the fan is now not working. I pulled it, ran 12v to each side, and both speeds work. I tested the fuses and relays and they are fine too. Iím leaning towards the PCM but we shall soon see.
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