Engine Cooling problem
1999 Chevy Malibu 6 cyl Front Wheel Drive Automatic 146000 miles
Hello, this is my moms car, and recently she started having overheating issues. The antifreeze had been disappearing for a couple months, and there were no leaks anywhere below the car. We decided to replace the lower intake gaskets, hoping that was where the antifreeze was going. Now, the antifreeze is always full, so one problem solved. However, now we have another. We replaced the thermostat for her as well, and I think I may have gotten a bad one, or one for a different temperature. Ever since replacing, she has had practically no heat. And the car is still overheating. I can idle the car in the drive way for as long as I want, and it will not overheat. The fans kick on, and the temperature holds steady. I can drive the car for about a mile or a little over and it overheats. It's like clockwork. If I take the same route whenever I test drive it, it overheats at the same street everytime. The coolant is forced out of the reservoir, so I have to refill it. If I turn around, and head towards her house, its downhill most of the way, so I can coast a lot, and it wont overheat as quickly. And I have noticed that when it starts to get hot, if I let off the gas and coast, the temperature will come back down after a minute. And everytime the temp comes down, I will have hot heat for a few minutes. As soon as the temp starts to get hotter, the heat gets colder. I was wondering if a thermostat could cause all of this, or if it might be something else entirely. I replaced the lower radiator hose because it was brittle on the backside and I know they can be sucked shut by the water pump when they are soft. I also replaced the serpentine belt because it was worn. Any suggestions would be greatly appreciated.
Wednesday, January 7th, 2009 AT 6:41 AM