After the latest cold snap we had a problem starting the van. Once she started we have no heat. The fans are blowing only cold air. As well we can not change from vents to anything else, like floors defrost...
We have replaced both fuses that have to do with the climate control and heat. Any help would be great.
Had the same problem with 03 Montana and it was the actuator assemble. It controls the hot and cold air and controls all of the other functions....defrost, floor etc...
Your radiator may have frozen the thermostat
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Thanks to all that replied. We took it in for a diagnotic and it turns out that there was a "service call" to have the heaters reprogrammed. This service call had been out since Feb 2008. But since GM had put it down as a service call no one whos vehicles are affected will know about it till they go in to the garage/dealer for a problem or this problem.
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