@tw758 Does it start out blowing cold and then turn hot? Or does it seem random?
Intermittent cooling is often caused by parts of the AC system freezing up. Typically an iced over evaporator. If the evaporator is covered in ice can’t cool the air. Once the ice melts, the cold air eventually returns. Could be a dirty cabin air filter or a blocked evaporator drain or an overcharged system. Do you see any puddles of water under your car?
I have a 1998 Ford Explorer Sport. Every time i switch from a/c to heat, it does not want to switch. I would wiggle the switch and it finally would. now it doesnt switch at all. could it be the switch or a wire?
I have a 97 Pontiac transport. Periodically when we shut ignition off the blower motor fan will stay on, draining the battery. I am suspecting a bad blower motor relay but cant find information on location. It is not listed in fuse panel on passenger side of dash or in relay box under hood in front of wiper motor. I am not sure if it is all part of blower motor resister. I have to assume it has separate relay but can't find any info on it.
I have a 97 Pontiac transport. Periodically when we shut ignition off the blower motor fan will stay on, draining the battery. I am suspecting a bad blower motor relay but cant find information on location. It is not listed in fuse panel on passenger side of dash or in relay box under hood in front of wiper motor. I am not sure if it is all part of blower motor resister. I have to assume it has separate relay but can't find any info on it.
Depending on how Pontiac did various models, your car could have a true relay that has resistors and switches among connections there to reduce the voltage to change the fan speed
OR
you could have a blower control module device which is all electronic. With these there was usually a display that showed fans speeds on an LCD readout in the vehicles. The relays could fail in various ways. The fan speeds could be different speeds than they were, sometimes varying while driving. But they also could continue to drain current from the battery when off.
These are two pictures to show what the electronic module is like. Search on the net for location pictures or diagrams for your vehicle. These came from rockauto.com
Lesabres and H-bodies had them on top of the blower box under the hood near the cowl. They had a master fuse block above them that could be loosened with one bolt and moved for easier access. Later models had the control module inside close to the blower with part of it inside the airstream inside the blower box. The moving air is needed for cooling the device.
Also search for the Chevy/GMC clone of the Transport. Likely more of them on road with more people posting about them...
Comments
Intermittent cooling is often caused by parts of the AC system freezing up. Typically an iced over evaporator. If the evaporator is covered in ice can’t cool the air. Once the ice melts, the cold air eventually returns. Could be a dirty cabin air filter or a blocked evaporator drain or an overcharged system. Do you see any puddles of water under your car?
OR
you could have a blower control module device which is all electronic. With these there was usually a display that showed fans speeds on an LCD readout in the vehicles. The relays could fail in various ways. The fan speeds could be different speeds than they were, sometimes varying while driving. But they also could continue to drain current from the battery when off.
These are two pictures to show what the electronic module is like.
Search on the net for location pictures or diagrams for your vehicle. These came from rockauto.com
Lesabres and H-bodies had them on top of the blower box under the hood near the cowl. They had a master
fuse block above them that could be loosened with one bolt and moved for easier access.
Later models had the control module inside close to the blower with part of it inside the airstream
inside the blower box. The moving air is needed for cooling the device.
Also search for the Chevy/GMC clone of the Transport. Likely more of them on road
with more people posting about them...
2014 Malibu 2LT, 2015 Cruze 2LT,