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  #1 (permalink)  
Old 21 Dec 2012, 01:19 pm
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Default Cooling system problems

Hello,
I have an 02 touring, this summer I started having trouble with overheating. After driving longer than 30 min at 50+ mph or while sitting in traffic the temp gauge starts to climb quickly toward red. After doing some research here, I did the following.

Replace radiator fan and relays
Replace coolant temp sensor
Replace thermostat
Radiator flush and fill

none of these helped. It doesn't leak any where, and I don't know what else to try. I haven't been driving it, the possibility of being stranded with a ruined car is just not attractive.

Any advice would really help.
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Old 21 Dec 2012, 01:24 pm
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Default Re: Cooling system problems

If it's overheating while driving, good chance you have a cracked head gasket, slow leak into the combustion chamber where the coolant is burned off and out the back.

Time for a compression check.
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Old 21 Dec 2012, 02:16 pm
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Default Re: Cooling system problems

Could also just be a clogged radiator!

Are you losing coolant, or no?
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Old 21 Dec 2012, 02:19 pm
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Default Re: Cooling system problems

Quote:
Originally Posted by thesameguy View Post
Could also just be a clogged radiator!
Have you read what he said about a "Radiator flush and fill" ????
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Old 21 Dec 2012, 03:13 pm
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Default Re: Cooling system problems

Yes - but what does that have to do with a radiator being clogged or a system losing coolant?
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Old 21 Dec 2012, 03:17 pm
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Default Re: Cooling system problems

Quote:
Originally Posted by CREWZIN View Post
If it's overheating while driving, good chance you have a cracked head gasket, slow leak into the combustion chamber where the coolant is burned off and out the back.

Time for a compression check.
Quote:
Originally Posted by thesameguy View Post
Could also just be a clogged radiator!

Are you losing coolant, or no?
Quote:
Originally Posted by CREWZIN View Post
Have you read what he said about a "Radiator flush and fill" ????
Did you read he is not indicating losing any "coolant"?




Just because the parts were replaced does not mean that;.
1) they were all installed correctly
2) they are all functioning as they should be


The first thing we would perform in the shop is a cooling system inspection test and all appropriated pressure tests.

If failed or inconclusive:

Chemical test of the coolant.
Compression and or leak-down test of the engine.
Thermal check of the radiator and thermostat housing.
Electrical test of the radiator fans


If all else fails for the PT stop working on it and shop for a new Mares regulator!
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Old 21 Dec 2012, 05:05 pm
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Default Re: Cooling system problems

Quote:
Originally Posted by NitroPT View Post
Did you read he is not indicating losing any "coolant"?
Was that directed at me or someone else?

I did not read where he indicated no loss of coolant. I read he doesn't have leaks, but that doesn't rule out consumption. Perhaps I missed something.
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Old 21 Dec 2012, 06:07 pm
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Default Re: Cooling system problems

How about checking to see if the fan actvates when engine is at temperature
Mine was doing the same until I found out fan was not turning on
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Old 21 Dec 2012, 06:13 pm
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Default Re: Cooling system problems

Quote:
Originally Posted by DODGETHIS View Post
How about checking to see if the fan actvates when engine is at temperature
Mine was doing the same until I found out fan was not turning on
He REPLACED the Radiator Fan and both relays. Yea, I know, still doesn't mean the fan is coming on but hopefully that was checked after everything was replaced.
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Old 21 Dec 2012, 06:37 pm
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Default Re: Cooling system problems

Quote:
Originally Posted by scubasquid View Post
After driving longer than 30 min at 50+ mph
This more or less rules out a fan problem. The fan should never come on while in motion - no fan is going to be more effective than moving through the air at 50mph. I just drove from Sacramento to Los Angeles without a radiator fan in the PT over Thanksgiving weekend!

The things that would cause an overheat while in motion is a clogged radiator, a wrecked pump, stuck thermostat, trapped air, headgasket failure, or bad cooling system pressure. In the case of the latter two, you would always have a consumption problem (coolant burned off, or escaping from somewhere).

Assuming there is no consumption problem, I would check the radiator with an infrared thermometer. I would check proper functioning of the thermostat by checking the temperature of the top radiator hose near the radiator. You should be able to check for coolant flow by removing the radiator cap and revving the engine - that *somewhat* rules out a pump whose impeller or pulley has separated from the shaft - but it could only be an "at speed" problem.

Overheating while in motion is very, very commonly a clogged radiator.
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