You have pulled loose a vacuum line somewhere during the install.. its "defaulting" to heating mode.
Sounds like you could have blown a fuse. Or you could have to get a new blower motor. Make sure you didn't accidentally disconnect any wires when you were changing the heater core. Hope this helps, James Booth
Replacing the heater core in a Pontiac Sunfire is a very difficult and complex process. The heater core is kept within the car's heating/air conditioning module behind the instrument panel. So many other parts have to be drained and removed from the car
to reach the heating/air conditioning unit that you may be better off
leaving this to a professional mechanic--especially one licensed to work
on air conditioning units.
Things You'll Need:
249 views
Usually answered in minutes!
×