If the van heats good on vent and floor why can I not get heat up at the defrost? the recirculation door seems to move properly when switched, any ideas?
SOURCE: 2000 pontiac montana heat issues
Try checking the cabin air filter, if equiped. It may be clogged making it draw more cold fresh air. Check your owner's manual to see if you have one or not, and it's location.
SOURCE: 2004 Pontiac Montana blows cold air in defrost
There is a mix damper inside your duct that controls the heat over heater core and ac evaporator that to your floor and one to your defrost. it is probable an electric actuator, that is not functioning properly. If yu can locate it and manually move it, you might have to remove the actuator motor first, you should be able to figure out your problem, I hope this helps! merry Christmas!
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