You can see where hoses connect at the firewall Located behind the glove box area
it might be your a/c heater blend door actuator is bad and not closing when the heat is or you need to bleed your system
Sounds like a defective heater core
Locate transmission modulator 95 Buick
Check for a vacuum leak.
money
fronts are 4X6 backs are 6X9
95 mph.
body lift
press back down on the pedal
5/16" allen
yes it does ,you can see it a raised lump in the middle of the key
It may need a heater core.