Question about 1999 Pontiac Montana
I have replaced the thermostat, engine coolant and climate control module. I have also looked into the heater selection flap driven by an electric motor in the heater box and I am satisfied it is working. I have noted that the auxilary coolant pump for the heater core is not working and have hard wirred it to a switch. Even with it hard wired the van still does not blow hot air. I am satisfied that there is cooland passing through the heater core as both hoses are hot and feel as though there is movement. My questions are: Where is the switch that controls the auxilary coolant pump, from the schematic it is feed from a fuse witch is good, to the switch then the pump.
I have also read that there is a chance that the problem could be a programing failure in the powertrain control module after a thermostat fails. That would suggest the module needs to be reprogramed. I dont get it, does that seem practical? My last question is what is wrong with this van...please help
It seems to be the only thing left would be the heater core replace that and see if that works here to help Shaun
Posted on Nov 16, 2008
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Posted on Jan 02, 2017
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