Hi folks, I have tried searching, here and and Google, alas nothing concrete to be found..
what I have is the entire drivetrain from a 94 formula, along with all ancillaries, it is going into a 1983 jag xj6,, the mechanical side of things should be a breeze, however no matter how many schematics I look at, I cannot figure out the ac system, all I need is compressor and fans to.work, as everything else is jag controlled,
can someone tell me if this is possible? I am seeing pressure sensors, and evap coils sensors, etc, can they be bypassed or ignored? Any helpmwould be greatly appreciated.

If more info is needed, please let me know, I am using the jag evap and condenser, hoping to just have new lines made up..
thanks
Darren

 

The PCM controls the compressor clutch, based on inputs from the HVAC control assembly, the refrigerant pressure sensor, and the evaporator temperature sensor. It's shown in the PCM wiring diagram:

http://shbox.com/1/1995_pcm5.jpg

Have you reviewed that diagram?

Additional info is contained in the 1994 factory service manual, free download here:

https://www.mediafire.com/?40mfgeoe4ctti

You would have to interface the Jag's A/C control switch with the PCM, insert the 94 temp sensor into the Jag's evaporated coil, and incorporate the pressure switch in the correct location in the Jag's plumbing.

Factory wiring harness:

http://shbox.com/1/harness.htm

94 and 95 are identical in this area.

 

Hi,
thanks for the reply, yes I have that page printed, along with tons of others from.shoebox and lt1swap, I guess I need to find out of I can use the jag 12 volt.signal and use it to engage clutch and activate fan relays, am I correct in assuming that if I do that, the idle will will be adjusted by pcm without input?

 

The A/C control switch wire connects to connector C230. Connector pinouts - note tabs at bottom for each connector:

http://shbox.com/1/harness_connector_faces.htm

 

I currently have that connector on my dining room table ( much to my wife's dismay) previous owner completely hacked up the fuse block it attaches to, thank you for that link. I still.havent put engine in the jag yet, but trying to make everything as easy as possible.once it's in place.

 

You don’t activate the clutch directly. The A/C control switch tells the PCM the A/C has been requested. If the required conditions are met, the PCM actuates the clutch relay.

The PCM activates the coolant fans based on input from the coolant temp sensor in the water pump housing. 94 fan controls can be either 2 relays (early production 1994) or 3 relays (late production 1994):

http://shbox.com/1/1995_pcm6.jpg

 

Sorry, internet went down...

I guess my next question then is can pcm be tricked iinto thinking that those sensors are there? As access to evap on jag is a 3 day job!!

 

Have no idea.... I deleted my A/C 20 years ago.

 

Ok, thanks