over heating,not my mopar tho

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timbolia said:
I came to post of a similar issue with the wives mini van. Not Mopar. But the question I had was the car will cool to the middle of the guage if we turn on the heater. I replaced the thermostat yesterday, and she just called that it did it again. Any ideas?
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Probably a clogged radiator. Your heater is serving as the radiator, which might work thru the winter. In newer cars w/ aluminum radiators, it is probably cheapest to just replace it. I did so in both my Mopar minivans the last 2 years. Both were leaking at the rubber gasket on the reservoirs. Cost ~$120. One off ebay and one at a local radiator warehouse store. The ebay one's core was too warped to get all the bolts in. Appeared perhaps a factory reject, but 2 bolts were sufficient and it works fine. Might have been <$100.
 
timbolia said:
I came to post of a similar issue with the wives mini van. Not Mopar. But the question I had was the car will cool to the middle of the guage if we turn on the heater. I replaced the thermostat yesterday, and she just called that it did it again. Any ideas?
Click to expand...

.....Is the electric fan cutting in...........kim...........
 
Hi guys thanks for all the info. It was a leaking radiator. $390 with labor for a new one, but the wife is safe and happy.

Thanks
Tim
 
Snake;
To answer your question a faulty radiator cap can create the problems you described. Water boils at different temperatures depending on the pressure it is under. A radiator cap rated at 15 pounds will raise the boiling point approximately 30 degrees. As the water temp rises the pressure increases. Once the pressure in the cooling system exceeds the caps ability to hold the pressure the water is expelled into the over flow. When the pressure in the cooling system drops a vacuum is created that pulls the water from the overflow back into the radiator. With a faulty cap you end up with 2 issues. First coolant that should be in the radiator is pushed into the overflow as the motor heats up. Second the lack of pressure in the cooling system lowers the boiling point. The faulty cap will not let the engine draw the overflow water back into the radiator as the engine cools. This gives you a low coolant situation as well as an area for air bubbles to form above the cooling fins. All this combined will cause the car to run hotter than normal. I would say you have fixed the issue.
~Michael
 
Dartman1969 said:
Snake;
To answer your question a faulty radiator cap can create the problems you described. Water boils at different temperatures depending on the pressure it is under. A radiator cap rated at 15 pounds will raise the boiling point approximately 30 degrees. As the water temp rises the pressure increases. Once the pressure in the cooling system exceeds the caps ability to hold the pressure the water is expelled into the over flow. When the pressure in the cooling system drops a vacuum is created that pulls the water from the overflow back into the radiator. With a faulty cap you end up with 2 issues. First coolant that should be in the radiator is pushed into the overflow as the motor heats up. Second the lack of pressure in the cooling system lowers the boiling point. The faulty cap will not let the engine draw the overflow water back into the radiator as the engine cools. This gives you a low coolant situation as well as an area for air bubbles to form above the cooling fins. All this combined will cause the car to run hotter than normal. I would say you have fixed the issue.
~Michael
Click to expand...
thanks yes so far its good.
 
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