Need Help?

1991 Pontiac Grand Prix GT 2dr Coupe

1991 Pontiac Grand Prix
Do you own this car?
Estimated Mileage
Enter current mileage for most
accurate info about this vehicle

Track Your Service Records
Get Recall Alerts
Get Updated Value Estimates on Your Car.

back to question list

Ask the Community

Ask Our Auto Mechanics

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

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

0/0 users found this helpful.

Ask our panel of certified auto mechanics a question. We pay for their advice so you don't have to

My Auto Score

See the free AutoCheck score

Meet The Experts
Kim Perrin
Kim Perrin is our resident mechanic here at DriverSide. Kim worked as…
Tyler Orr
Tyler Orr is an expert in German and Japanese cars and has been a mechanic …
Elizabeth Kriesten
Elizabeth Kriesten worked as an automotive technician for several years at Dodge…
Tips on Servicing

Car Brakes: How Do You Know When to Change Them?

By Zach Bowman For those who suffer a daily commute through heavy traffic, your vehicle's braking system can bring thousands of pounds of metal, plastic and empty Starbucks cups to a stop hundreds of times before you get to work. It goes without saying that these pieces wear out, but they do so slowly, meaning you may not notice they need attention until ...

Read more…