A-C

Looking at a schmatic, the only idea I have is possibly the constant control relay module.Have no idea where it is located or how to test it.Have checked fuse no. 23 on inside panel and fuse no. 24 in engine compartment

Check the wiring to the clutch could be open-continuity test

Looking at the database, I don't see a 500 made here until 2005.

Wrenchtech, its not a 500.Regular Mustang 3.8 v6

I see, wrong category. I don't know where you got your fuse numbers from but the inside fuse is #2 and the outside fuse should be labeled A/C pressure. I'm finding no info on the location of the CCRM but they can be mounted near the battery, the headlights or the strut tower. The 98 Mustang has it on the right fender well, next to the air filter. I attached a picture of it. Test for ground on the Pink/yellow wire at the CCRM to know if the PCM is commanding it on.

I see now where you got the fuse numbers. They supply the control head. The ones I gave you supply the compressor.

checked all fuses on inside panel as well as panel under hood, all are good. Why would I have power at the clutch cycling pressure switch, but no power at the clutch?

Because that circuit doesn't go to the clutch. Please test for ground at the CCRM as I asked.

Hang in there, I'am having a rough time locating the CCRM.

It's a square box with a single long plug that has one bolt in the middle of the plug holding it on.

Found it,black box about 3"x1"x1",located near firewall and next to dryer.Do you know what wire no. would be the ground.

The dimensions should be 3X3X1". I already told you what to test.

It was'nt the box near the firewall, but a black box located in the fender well. I made sure there was a good ground,but it still did'nt work.Is there a way to check the CCRM?

That's not what I asked you to do. I gave you a specific wire that is the trigger wire for the A/C relay. The PCM supplies ground on that wire to the CCRM. I need to know if the PCM is supplying that ground or not.

Followed your instructions,made sure CCRM was grounded,checked pink/yellow wire with engine running and ac off the wire read 13.8v,when ac was on it read .2v.

That's a backwards way of looking for a ground signal but it looks like it did answer the question. It looks like the CCRM is just not responding.

Thanks for your patience,I'll replace the CCRM,and let you know.

Closing question