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2005 Pontiac Grand Prix Base 4dr Sedan

2005 Pontiac Grand Prix
Trim Info:
Front Wheel Drive, 4 Door Sedan, Mid-Size
20 mpg city / 30 mpg hwy
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May 9, 2013, 7:06 am

Matt E
 

Question: Coolant system

a few months ago the my engine temperature began to fluctuate between normal and hot. When I would drive using the gas it would cool down and when I would stop it would heat up. it would not produce any heat. When I would get oil changes the temperature would be normal but after a while of driving it would go back to the fluctuating. about 3 weeks ago my engine began to smoke and so I changed the thermostat because that is what I was told was the problem. we cleaned out the coolant system and put brand new coolant in it. the temperature at this time still went high and it turned out that the heater hose fittings had completely blown apart. I replaced the heater hose fittings and ran my car. It still got too hot. I was told to take a look at my radiator fans and so I did yesterday. I was able to run my car for about 45 minutes without it overheating. It got to normal operating temperature and actually stayed there for a good 6-7 minutes and then began to heat up. When the temperature got to slightly 3/4 the way to overheating the fan kicked in. It cooled the temperature down significantly but not to where it should be and then the fans turned off. This is where I am at with my car and I am unsure of how to diagnose it. It is a 2005 Pontiac grand prix.


May 24, 2013, 1:40 pm

Elizabeth K
Expert Mechanic

Here is an article on how to troubleshoot an overheating problem. Your problem sounds like a partially plugged radiator, have that inpsected.


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