Question about 2004 Pontiac Montana

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Vehicle heats up very fast and I get no heat out of the dashboard. The upper hose is hot but the lower hose is cold after running the engine overheats. When I started it, the belt was squealing. Aft

Don't know where to start to find the problem or what to replace.

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START WITH THE BASICS. CLEAN, FULL 50/50 MIX IN SYSTEM. CHANGE THERMOSTAT. LOOK FOR TRACES OF COOLANT LOSS FROM THE WEEP HOLE IN BOTTOM OF WATER PUMP (USUALLY UNDER PULLEY). WATER PUMP DRIVE BELT OR SERPENTINE BELT MAY NEED TO BE REPLACED. ALSO MAKE SURE RADIATOR CAP IS WORKING PROPERLY.CHECK FOR LEAKS ANT WHERE ELSE IN ENGINE AREA.

Posted on Dec 04, 2014

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Could be thermostat is stuck closed, could be a blockage in the radiator. The belt squeal most often is the water pump. If you want to check it yourself, remove the belt and spin the water pump pulley by itself. Listen for bearings binding, grab the pulley and move it side to side, if it wobbles even a tiny bit it's trash.If you replace the pump you also need to replace the thermostat,therm.gasket,check all coolant hoses and replace if spongy, by-pass hoses, heater hoses,etc. Flush the radiator and replace the radiator cap.If the belt is cracking look for cracks running side ways across the belt Replace it. Good Luck

Posted on Dec 04, 2014

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You could have a simple or a more in depth problem. The thermostat could be stuck closed not allowing coolant to flow. But with the belt noise I believe your water pump is bad. You will need a qualified mechanic for this repair.

Posted on Dec 03, 2014

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Replace the water pump, it's shot.

Posted on Dec 03, 2014

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Posted on Jan 02, 2017

santa5243
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SOURCE: My van started overheating after a below freezing night. When I started it, the belt was squealing. After a short time the temp was up and the high temp light came on. After I shut it off, the cool

Your anti freeze was weak and froze.the belts squealing was due from the pump was froze (ice). Put your car in your garage and use a heat gun around the engine block to warm the metal so internal temperature will rise and melt the ice.once defrosted star the car and check coolant level.use hydromiter to check your anti freeze. Should be 30 to 40 below zero.

Posted on Nov 19, 2014

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