My 2004 pontiac grand am is overheating periodically. This issue seems to arise when I have been driving for long periods of times. When I am driving down the highway it does not happen. I noticed it started when I was in stop and go traffic. The vehicle had water in the system and continued on home without it overheating that evening. The next day I popped the hood started it and let it idle. It never overheated while sitting there. I did notice that the fans sounded louder than the day before. Today when I drove for about two hours it never overheated but it was all highway. When I got home I kept it running popped the hood let it sit idling. Again the fans did not sound like they were as loud but it did not overheat while idling. I even kicked on the A/C to see if it would overheat and nothing. Also my heater has not worked either. It will blow semi-warm on control speed 1 but if I put it any higher it only blows cold. I have not noticed any leaking anywhere on the inside of the car and like I say it has been maintaining radiator fluid at the proper level.
So my question or questions are do you think it may be the thermostat, the electric fans, heater core, or even maybe the electric fan relay switch. I'm stumped as to where I should begin and can not reproduce the problem. I don't want to replace everything if I don't have to. Any help would be greatly appreciated.
So my question or questions are do you think it may be the thermostat, the electric fans, heater core, or even maybe the electric fan relay switch. I'm stumped as to where I should begin and can not reproduce the problem. I don't want to replace everything if I don't have to. Any help would be greatly appreciated.
