SOURCE: Looking To Recharge The AC in a 2002 Pontiac Montana
the low port is between the engine and the radiator support and the high pressure port is by the cruise controll module
SOURCE: 2002 Pontiac Montana Thermostat replacement
check the coolant level fiirst...if that is low it wont give you any heat.....to change the thermostat you have to follow the top radiator hose to the engine.at the send of it you will see a clamp take it loose...then you will see the thermostat housing its held in place by 2 bolts . once you remove them you have the thermostat....make sure you clean all the old gasket material off both the housing and mount.also make sure you get a new gasket.
SOURCE: pontiac montana oil pan bolt diagram for removal
If all the bolts are off, then the gasket is holding the oil pan in place and your going to have to tap it with a mallet, Not a hammer but a mallet so you don not damage the oil pan. Good luck and hope this helps.
SOURCE: 2002 Pontiac Montana, No Heat, I put the temp control on
the cabel from the heat dial to the heater box behind the dash could be snaped or jamed thus not opperating the lever which operates the flap which open and closes the heat box next to the matrix. or if your coolant is brown in colour it could be your matrix is clogged with sedament and needs flushing out. or it could be your water pump not pumping coolant round your engine or it could be a knackerd thermostat i hope these will help you id start with the easyest first thermostat
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