Automotive Air Conditioning Information Forum (Archives)

Mustang1 on Sun July 01, 2012 6:24 PM

Year: 1998
Make: Ford
Model: Mustang
Engine Size: 3.8L V6
Refrigerant Type: R134
Ambient Temp: 95
Pressure Low: 110
Pressure High: 110
Country of Origin: United States

1998 ford mustang V6 will not turn on

FS10 compressor
Low side pressure static 110 psig/about same when engine running
High side pressure static 110/about same when engine running
Above checked separately with gauge set to verify no leaks in gauge block
Compressor clutch will cycle when jumpered to battery
Compressor did not cycle when low pressure switch jumpered with system running
Replaced low and high pressure pressure switches (no change)
Aux fan does run when ac switched on
Compressor turns by hand


Any thoughts on what to test/try next to diagnose problem? Thanks

Dougflas on Sun July 01, 2012 7:11 PM

Does the 98 have a CRM module like the 95 models?

Mustang1 on Tue July 03, 2012 10:37 AM

Mustang1 on Tue July 03, 2012 10:38 AM

Ye, I believe it does.

Dougflas on Tue July 03, 2012 11:44 AM

That is a good place to start

Mustang1 on Wed July 04, 2012 1:33 PM

Thanks, any recommended test method?

Dougflas on Wed July 04, 2012 4:16 PM

Do you have the schematic? If not, you can get a vehicle specific CD with all info for your car.

Mustang1 on Thu July 05, 2012 6:52 PM

Control module was bad. Swapped it, works like a champ. Thanks for the help!