2000 MONTANA OVER HEATING
Asked by hansen73 Jan 20, 2015 at 06:53 AM about the 2000 Pontiac Montana Base
Question type: Maintenance & Repair
van is overheating and losing heat. heres the list of parts replaced; head gaskets, radiator,
water pump, thermostat, some hosing and clamps.
Am i missing something here, could it be a sensor.
6 Answers
any explanation on how to do this, Jim ?
tried that and the same thing is going on. what else can i do to resolve this problem.
I even took it for a test drive, and the heat would be hot and the temp gauge would stay down, then it went to cold air and the van started to get hot and the gauge went up to the red. i am confused about it all.
I have 2001 Pontiac Montana I've changed the thermostat, water pump, over flow hose ,an the Hose Key I guess is what its called an the system bleed as long an I have heat as long as I keep my foot on the gas it doesn't over heat but if I don't it goes straight to the red til I hit the gas again what could it be
cmartman56 answered 5 years ago
Easy to do is routing the serpinteen belt over the top of the water pump instead of below. Doing this mistake the water pump to run backwards. Also if the power steering pump is miss routed the steering will not work. Just a suggestion!!!!!
Seems like you may be getting an air lock in your heater and/or hoses. This would be caused by a compression leak from the combustion chamber into the coolant system. When the air lock forms the motor will heat/overheat and the air coming from the cabin heater will be a lot cooler. Sometimes revving the engine will move it along. If the level of your coolant reservoir rises when it is overheating it is a possible indication of such a leak. Get a radiator compression test to see if anything is getting into the water coolant. Another test is to remove each sparkplug at a time and insert a plug designed to take an air compressor hose. As you move from one plug to another replace the sparkplug you removed before moving to the next one. Rotate the crankshaft till it is under compression stroke (TDC) and with the radiator cap off apply the compressed air to the cylinder while watching the top of the fluid in the radiator for signs of bubbles or hissing. If bubbles or hissing occurs then there is a combustion chamber air leak into the coolant from that cylinder. Definite cause for overheating, could be faulty gasket or possible crack in block or head.
