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'05 Impala blowing cold air, guage went up on hot (red zone). Why?
- Heater Core was flushed 2-3 weeks ago. All new coolant in her.
- Checked coolant levels in resevoir and in radiator. Perfect. No discoloration either.
- front fans on radiator are kicking in as they are suppose to.
- Exhaust looks normal.
- No foam or abnormal indications in the oil...checked, because worried about head gasket. Oil great.
Am I looking at a thermostat issue? Water pump issue perhaps? Or could it be bad head gasket and I'm missing something? (not sure what else to look for)
Engine 3.4L. Vehicle has 221000 KM on her. Manifold intake and head gaskets were replaced @ 103000K (about 6 or 7 years ago).
Car ran hot going up a hill. History of issue - intermittedly she'd blow cold air (but not consistantly.). She never overheated before though; Just the tempreture guage was "flucuating". Thinking it was heater core blocked, I got her flushed. Thermostat wasn't changed at that time. Mechanic said it was working fine....and car was putting out hot air after the flush was done up until a day ago.
Any genius mechanics out there want to take a guess at diagnosis?
(Please help. Seriously getting frustrated with this.)
3 Answers
- M.Lv 76 years ago
Your car is female? She does not work?
The common cause to cold heater and hot (overheating) engine, is lack of coolant. That means there is not enough coolant in the COOLING SYSTEM (engine, radiator, hoses). I am not talking about the level of coolant in the overflow (surge) tank. You need to take the radiator cap off when the engine is not hot, and look inside the radiator. The coolant should be right to the top of the radiator neck, where the cap goes. If it's not, fill it up and put the cap on. You may have a leak? It's NOT the thermostat, because if the cooling system was full and the engine was overheating, the heater would blow plenty of heat. Unless the thermostat is stuck closed, then it would be plenty hot in the heater, until coolant was blown out of the cooling system by the steam from prolonged and severe overheating.
- GlennLv 56 years ago
Thermostat replacement would be a smart idea. It's a $15 part, vice a $1200 repair. Blowing cold air could be the heater valve. trace the control cable from climate control to valve and verify it is moving open/shut as it should. GM climate control problem worth looking at:
https://www.youtube.com/watch?v=NCQYuqIu6F0
and
https://www.youtube.com/watch?v=1vbVfq-aFw8
Demo car is a Buick, but the defect applies to Chevy Impala among several other models.
