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05 Impala Overheating
Hi, new to the forum, but hoping someone can help me figure out what's going on, so I don't have to deal with any local mechanics.
To start off, I recently picked up an 05 Impala, with the 3.4L Engine.The guy I got it from told me he was driving along with his heater on when all of a sudden the heater went cold and the overheat warning came up. He took it to his shade tree mechanic, and was told it had a busted head gasket. Not really caring for repairs, and being well off, he went out and got himself a new car, with the mechanic offering to take the old one off his hands for $100. Obviously the guy was trying to scam him, but the guy is a family friend and offered to let me have it.
Now... The car starts up and purrs like a kitten, no misfires, strong compression, and all of the fluids are clean and clear. The radiator is clear as well, save for what i'm assuming is DexCool gunk in the filler cap, as the cooling system doesnt seem to have ever been flushed. Im not sure if the Mechanic did it or what, but the low end bleeder valve was open and spraying coolant out onto the motor, and the high end seemed to be leaking a bit. I tightened the low end up, put some water in it, and got a few miles down the road when it overheated. I unscrewed the low end bleeder valve some, it shot air out, and I made it the remaining 6 miles home with the gauge bouncing between 1/4 and 3/4 marks on the temp gauge.
There's a few things I've considered...
The previous owner dumped regular coolant in with the aging DexCool, and it's gummed the cooling system up, which has in turn gummed the Thermostat up as well, but not enough to completely screw it up. Or the cooling system needs the air purged.
Personally I think a system cleaning, and a new thermostat would clear the problem up, but i'm the last person i'd refer to as an Expert when it comes to Impalas. If anyone has any ideas or suggestions, i'd be grateful for them.