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HELP OVERHEATING

 
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Old 17 May 2017, 08:14 pm
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Default HELP OVERHEATING

OK I just bought my daughter an 05 PT touring. It is a nice little car but it has started intermittent overheating. It does it on the interstate with the AC on. If
I turn off the ac it is OK. I had a stuck thermostat and replaced it and thought it fixed it (it was fine for a week or so) but now it is running hot again.
the two stage fan is running. I am not losing AF. There is no water in the oil or oil in the AF. It seems to be worse at higher speeds and under load like up inclines. Any thoughts????
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Old 17 May 2017, 08:54 pm
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Default Re: HELP OVERHEATING

How many miles and do you know if the water pump has been changed or the radiator cap?

Typically I would think the fan but you state the high and low speeds are working and I believe above 45 mph the fan is either off or low speed since you have the ram air into the radiator. But I could be wrong and I am sure someone will chime in.
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Old 17 May 2017, 09:01 pm
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Default Re: HELP OVERHEATING

Sorry 88000 miles. Just bought it so I have no knowledge of past service. My mechanic thinks it may be a partially plugged radiator. They are $50 so the diagnosis fee is more than just replacing it. but $50 is a ton of money to me right now especially since we don't know if it will fix it.
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Old 17 May 2017, 09:05 pm
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Default Re: HELP OVERHEATING

i would suggest doing an engine coolant compress test first. Make sure your engine coolant system is sealed.

Also check the radiator cap as someone already posted.

After the engine cools down check to see if the coolant is still up to the top when you take the radiator cap off. You need to see if you are getting air in the coolant system.
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Last edited by ptcruisersteve; 17 May 2017 at 09:08 pm.
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Old 18 May 2017, 07:30 am
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Default Re: HELP OVERHEATING

Take time to listen for a growling or grinding noise coming from the front of the engine. This will indicate a failing water pump. If so, it will also include a timing belt replacement as it has to be removed anyway to get to the pump. Check hoses, including heater hoses. Run the car with the radiator cap off and look for bubbles in the coolant. Lots of things to check as there are several potential issues that will result in overheating.
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Old 18 May 2017, 06:31 pm
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Default Re: HELP OVERHEATING

Drove all day today... NO PROBLEMS interstate and city driving. 90* today. It only does it when it feels like it. it is driving me nuts
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Old 18 May 2017, 06:47 pm
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Default Re: HELP OVERHEATING

NEXT TIME the temp gauge goes over half, stop and check to see if the cooling fan is running. You could have a failing fan motor which will work sometimes before a complete failure or a wiring harness connector problem damaged from heat. If the motor doesn't turn or is quickly going off and on due to bad brushes the connector may get hot and melt the plastic around the male and female pins. Check both ends of the connector.
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Old 18 May 2017, 09:16 pm
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Default Re: HELP OVERHEATING

Quote:
Originally Posted by CONNELLY698 View Post
Drove all day today... NO PROBLEMS interstate and city driving. 90* today. It only does it when it feels like it. it is driving me nuts
Sometimes it can take time for air to get into the coolant system. After the engine cools off check to see if the coolant is filled up to the radiator cap.

Are you getting any engine trouble codes?
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Old 19 May 2017, 12:56 pm
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Default Re: HELP OVERHEATING

if the fan is working for both the High and low...
then just replace the following.

All this is listed on Rockauto.com this what I did and problem solved. For both my PT and wife's...just replaced it all and don't have to worry about it for another 180000 miles if we still have them.

If the fan isn't working - if fan is not working Fan Assembly $55.79

Radiator (Rock Auto $56.79)
Radiator hoses upper$7.46 and lower $8.80
Radiator cap $2.51
Thermostat $2.80

Coolant..be sure to bleed system
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Old 19 May 2017, 01:07 pm
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Default Re: HELP OVERHEATING

Take a garden hose and spray through the a/c condenser fins and coils. You'd be surprised how much crap gets in there and restricts airflow through the radiator. I had tons of little leaf pieces, clumps of dirt and lots of unidentifiable various bug parts under the car when I was done.
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