ive converted my 89 T/A from tpi to carb. now that its getting close to summer ive been thinking about hooking up the a/c. ive been looking at some wireing diagrams and it shows some of the wires going to the ecm.... wich i no longer have in the car, or hooked up to anything. is it possible to rig it up to work without the ecm?

 

yes, the wires to the ecm should just be an a/c request (so the ecm can turn the fan on and raise the idle, if need be you can rewire it to an older style set-up (carbed)

 

so in the tech articles here it has 85 and 86 wireing diagrams, would mabey the 85 ones be carbed and the 86 tbi? ive only got like 2 wires that dont go anywhere comeing off the a/c set up. right now it doesnt run at all, is it possible all i have to do is ground one(or both) or apply power?

 

The ECM does not control the AC. The wires from the AC going to the ECM are not needed.

 

so what exactly determines when the a/c compresser should kick in at a certain pressure? what ever kind of circuit i had before is broken, i can get the compresser "clutch" to kick in by either applying power to, or grounding one of the wires. ive basicaly got two wires that dont go anywhere, twisting them together doesnt help at all, and im pretty sure both of them went to the ecm, because i cant see where else they would go.

 

It has to have a switched on/off power lead,
and on that you could either run a pressure switch or a thermal switch to cycle the compressor. The original switches may still be there in the car, you prolly just need to hunt them down.
If you have a local shop that services A/C, that might be really helpful.
I removed the A/C from my 3rd gen 13 years ago so I don't remember much about the wiring.... just that there was a pressure switch on one of the lines that triggered my cooling fan to come on when there was a certain pressure.