Get someone with electrical knowledge and a tester to check the supply etc to the fan. Also the switch if the rear is separate.
SOURCE: 2005 Pontiac Montana SV6 heater blows cold when slowing to idle
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
SOURCE: pontiac montana heater works but doesnt blow heat out on defrost
If the heater core is good and the blower works, the valve doors may not be opening and closing properly to direct air towards the proper vents. This may be because something has fallen in and is obstructing their movement. The actuating motors may not work properly, or the linkages that connect them to the mode doors may be worn or improperly adjusted. You can get a look at the mechanisms by removing the driver side knee bolster (two screws) and a lower trim panel on the side of the center console.
Be careful fiddling with the linkages. Everything is plastic and easy to break, and replacing the heater box requires removing most of the dash.
SOURCE: I have a 2000 pontiac Montana. The problem is with the coolant
We have the same problem. It's an air pocket in the cooling system. The cause can be anywhere from not filling the system all the way or most likely a leak has developed and air has entered into the system as the coolnt level has dropped. The coolant light goes off and on as the air pocket moves around.
Our Montana has a leaky intake gasket, which is the source of the problem. A very common problem with the 3.4. It should go for another 100K plus though, once it is repaired.
SOURCE: I own a 2006 Pontiac
probably the blend door not opening fully. Do you hear a clicking under the dash by passenger's feet? If not, try calibrating the system:
If this doesn't work, your actuator may have failed. Look under the dash to see if any of the actuators on the heater box are trying to turn when you change the temperature setting. Unfortunately, I cannot find aftermarket parts for your heater, so if the door isn't working you may need to go to the pontiac dealer. Let me know if you have questions.
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