The heater was not warming, but dash warning light was on. Had the thermostat replaced still no heat in the cab. The heater core was flushed. Hose are warm in and out of the rad? I noticed air bubbles when the engine was off bleeding into the the overflow reservoir.
SOURCE: 2002 montana getting overheated
sounds like a stuck thermostat. but check if the system has a bleeder screw if it does burp it and that will help also.
SOURCE: 2001 pontiac montana overheating no warm air when heat is on
Might be a weak or failing water pump... Does it leak antifreeze or do you have to add antifreeze very often? When the engine gets to operating temperature squeeze the top radiator hose and see if you can feel pressure from the water pump forcing water through it.
SOURCE: 1994 2.3 lt grand am. i have replaced the water
change the upper hose and if thats no good change your radiater it maybe no good with this car it happens alot
SOURCE: Heater not hot enough
Sounds like you've got an air bubble in the system, that brass screw on the top is for bleeding out the air.
SOURCE: 2002 pontiac montana overheats but
Either you have not bled the system, or possible fan not working, or head gasket problem. Solution
Step by Step
1. Check both hoses, do both have equal amount of pressure?
2. Run the vehicle where your gauge shows in the middle, shut the vehicle off then open the bleed valve near the heater line and wait till fluid comes out like a steady stream. Make sure you do not go low on coolant.
3. Turn on vehicle, turn on A/C high maximum blow check to make sure both fans are on. We are testing to make sure the fans at least work!.
4. After all this and you are still boiling over make sure your radiator cap is good if not then replace. Last but not least get a block tester to test for exhaust gases in the coolant. Rent one from autozone. $25.00 plus fluid which is about $8.00.
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