95/150/4.9/xl.My ac stop working won't get cold only hot air. hot air come's out all the time some where in the dashboard there even when the switch is off. sound like someone letting air out of a tire.I'll been reading other posts about heater/ac problems, nothing like mine. Did read something about a blower motor resister coil, am I on the right path ? thanks everyone

 

The blower motor resistor only controls the fan speed. Definitely not the culprit here...

Sounds to me (and I'm no expert) that you have a leak in the a/c system somewhere. I'd probably recommend having a shop take a look, but if you wait a bit, I'm sure someone will have some 'do it yourself' advice.

 

Assuming the systems is as I remember, does the AC compressor turn? Need to look at the center of the compressor pulley not the belt turning. If it doesn't turn, locate the AC lines at the firewall. One will go to the receiver dryer and then on to the evaporator in front of the radiator. On top of the receiver dryer is the cycling switch, up plug it and jumper the two contacts in the harness. This should start the compressor if the system is low on freon. If it does, then charge the system. Auto parts will help with the stuff.

 

The hissing you are hearing may be the vacuum for the heater/ac door. It may have come off or developed a leak and is keeping the door at heat.