Question about 1992 Pontiac Grand Am
Previously we replaced the thermostate and had to replace radiator cap and the water pump,been having a little trouble with the fan as to it hasnt been overheating until we were getting the car ready for winter,When it started overheating it never smelled hot but noticed that when checking the heater it was nothing but cold air.
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Posted on Jan 02, 2017
A couple of things to check because as you describe your symptoms you actually have 2 problems
1. No heat from vents.
Sounds like the heater water flow valve cable is kinked disconnected or the valve itself is stuck You will need to follow your heater core water supply lines to find the valve usually to the right of the center console in the ducting area / large plastic housing for heater and AC internal coils. If the valve works then there is a possibility that the heater core water supply lines have been bypassed on the engine side of the firewall with a coupling due to a leaking heater core. And l;astly the heater core could just be clogged. (quite rare!!)
As for the overheating engine after all of the work you have done.. Perform this simple test.
1. remove radiator cap
2. have someone else start the car
3. watch for water coming out of the open radiator cap area DURING start...
4. have person in the car rev engine gently 2 or 3 times. No need to exceed 2000 RPM. If water rapidly flows out of the radiator during engine revs.. you have some major engine issues.
If it passes all of these checks then the only thing left is improper hose connections on the engine side of the firewall and or a hydraulic water lock in the block that should clear itself by starting and stopping the engine many times with the radiator cap off.
Posted on Jan 27, 2010
take it to repair shop where they can pressurize the cooling system, they should be able to see where the coolant is leaking, Could be an intake leaking, Common problem
Posted on Feb 25, 2010
make sure that you don't have a intake leak,that will cause it to over heat quickly when accelerating,if you don't check to see if you have any air in the system as many times you've had your system open you probably do,bleed it and it should correct the problem.
Posted on Oct 20, 2010
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