I took the thermastat out and it's still overheating,sometimes i get heat and some times i don't. When i get heat the temperture stays down but when it blow cold air the temperture goes up.
2007-12-24 16:25:20 · 7 answers · asked by yogi 1 in Cars & Transportation ➔ Car Makes ➔ Pontiac
Sounds like your water pump is going out. When you get circulation (pump is moving the water) the engine heat is transferred to the car's heater and the radiator to keep the engine cooled. When the pump isn't moving the water the heat is not getting carried away from the engine and it overheats. Also since it isn't moving the water the car's heater goes cold as does the radiator.
2007-12-24 16:36:42 · answer #1 · answered by mustanger 7 · 0⤊ 1⤋
I have a 2001 Aztek, which is the same driveline as the Montana. I had a problem wit overheating. Here is what I found out..
The coolant was being forced out around the upper radiator hose when the engine was running at highway speed. This appeared to be the result of a radiator cap that fit too tight. When the engine cooled, and after all of the coolant in the recovery bottle was sucked back into the engine it would suck in some air as well. The design of the engine allows air in the cooling system to be trapped at the top of the engine block. and this causes the engine to produce steam on the top of the block that accelerates the process. When the coolant gets below the level of the heater hoses, the heater will blow cold air, and since the heater acts as a second radiator, the engine heat builds up even faster.
Have a radiator shop test the radiator cap to make sure the pressure is not too high. also check for leaks in the system. One more thing, when the coolant is replaced, the engine must be "burped" (or bled) to release the air trapped in the head. there are 2 bleeder valves, one is on the thermostat housing, the other is at the other end of the head on the front corner. The bleeders look like small metric bolts. to bleed the cooling system, do this.
with the coolant replaced, start the engine. after the engine warms up. open one of the bleeders a little until coolant comes out. then close it. Do the same for the second bleeder.
2007-12-28 06:16:45 · answer #2 · answered by Niklaus Pfirsig 6 · 1⤊ 0⤋
2002 Pontiac Montana Overheating Problem
2017-01-19 05:16:52 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Yogi, You probably have a head gasket pumping air into the cooling system. The loss of heat air is a clue that the combustion leak air locks the system and causes the engine to overheat. There is a sniffer that tests the air in the top of the radiator for combustion gasses and will tell if there is a bad gasket or cracked head. You will probably have to take it to a dealer or big garage to get this done. Hope this helps.
2016-05-26 04:22:57 · answer #4 · answered by ? 3 · 0⤊ 0⤋
worst thing you can do is remove the thermostat, no way the cooling system can do its job without a good working thermostat. Replace the thermostat with a new one and Have your cooling system pressure checked, that will tell you if the pump is working as t should.
2007-12-25 11:10:36 · answer #5 · answered by Anonymous · 0⤊ 0⤋
You may have some air trapped in the cooling system, or a leak somewhere.
2007-12-24 16:38:30 · answer #6 · answered by Anonymous · 0⤊ 0⤋
check antifreeze...if it is leaking then it then thats your answer but if its not then its something with your engine probably
2007-12-24 16:33:38 · answer #7 · answered by mcied150 3 · 0⤊ 1⤋