1988 turbo coupe air conditioning quit,

[billwright45]

No power going to compressor, when I hook up a jumper wire to high pressure switch , compressor works . I don’t know where to replace air conditioning module inside car or rely on passenger side fender

 

[74 Harley]

Did you check the amount of charge in the system? It won't come on if it is low on refrigerant.
If correctly charged you could have a bad high pressure switch.

 

[billwright45]

Full of freon

 

[billwright45]

New pressure switch

 

[74 Harley]

I may be wrong, but I don't think you have a "module" to replace. I just spent 2K getting the A/C rebuilt on my truck. It may be better to get it looked at by a good tech than throwing parts at it. Your owners manual should give a location for the relay, but if you're getting it to engage by jumping the high pressure switch I'm at a loss, as you have replaced the switch. Unless the new one is bad. Good luck, and keep us posted!