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Re: no rear heat in pontiac montana '99
Warm up vehicle, then access heater pipes that run to rear of vehicle. they should be HOT. if not you have a circulation issue. IF they are hot, then the blend door is not in the correct position. this door directs air across a hot or cold core to create the correct air temp. check and update me.
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I believe this is a built in delay so the engine has enough time to build heat to actually blow warm air.This will also let the engine warm up quicker for fuel savings and cleaner emissions. My 2009 GMC truck does the same thing as well as my buddies truck.Back before the computers ran the vehicles you would turn on the heat and get cold air or even frost blown at you if in Montana.
I would change the Thermostat. if that doesn't fix it? I would buy a Radiator flush and follow the directions exactly you will be surprised how much junk comes out. That should fix all your heat problems.
First off make sure the thermostat settings are set the same on the control panel for both front and rear units if thats ok it could b a few possibilities. 1 pluged heater core in rear 2 blocked heater hose try looking into these and see if it helps any
That is correct, the air blend door actuator. "flapper valve" may need to be replaced or cleaned and free from binding up. Good luck and hope this helps. If there is an Auto Zone in your area, they can order the part you need and give you the step by step instructions to removing the old actuator and replacing it if it's damaged. Good luck and keep me posted, be glad to help.
How cold is it there and does your engine cool down any while going slow? If it does it may mean you need a hotter thermostat installed, My first thought would be to check the coolant level in the radiator and the coolant reservoir! Hope this helps and Merry Christmas