Fox 1991 2.3 Mustang. A/c Problems.

[Bebo The Bum]

My blower motor doesn't work. I feel heat from the defrost part of the vent most of the time but, it snowed yesterday so I kept messing with the knobs to try to get some sort of connectivity out of the a/c. It still didn't blow anything but I noticed this morning as I drove it was blowing cold air. I stopped in a parking lot today to try to listen without my engine revving and it stopped but as soon as I started driving again I could feel it. Anyone know why this could be? How could I go about testing the blower/ AC panel? Would a continuity tester help with anything? I'm fairly sure my vacuum lines from the panel are going or are bad as well because when I try to switch my vents it hisses at me. Any help would be appreciated. I'm a new mustang owner and I am just trying to get this car figured out and in top shape.

 

[jrichker]

Look for vacuum problems first...

Diagram courtesy of Tmoss & Stang&2birds

HVAC vacuum diagram

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring http://www.veryuseful.com/mustang/tech/engine/ Everyone should bookmark this site.

Complete computer, actuator & sensor wiring diagram for 91-93 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/91-93_5.0_EEC_Wiring_Diagram.gif

Complete computer, actuator & sensor wiring diagram for 88-91 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

Ignition switch wiring
http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

Fuel, alternator, A/C and ignition wiring
http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

O2 sensor wiring harness
http://www.veryuseful.com/mustang/tech/engine/images/mustangO2Harness.gif

Vacuum diagram 89-93 Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg

HVAC vacuum diagram
http://www.veryuseful.com/mustang/tech/engine/images/Mustang_AC_heat_vacuum_controls.gif

TFI module differences & pin out
http://www.veryuseful.com/mustang/tech/engine/images/TFI_5.0_comparison.gif

Fuse box layout
http://www.veryuseful.com/mustang/tech/engine/images/MustangFuseBox.gif

87-92 power window wiring
http://www.veryuseful.com/mustang/tech/engine/images/mustang87-92 PowerWindowWiring.gif

93 power window wiring
http://www.veryuseful.com/mustang/tech/engine/images/mustang93PowerWindows.gif