OK I Over rid the ac clutch and it pumped 40 degrees air just fine but will not run on it's own. The car was recently wrecked on the divers side and pushed in enough to break the condenser. the car was repaired great except for one thing. behind the battery there is this multi connector that has 10 wires going in the bottom holes and 10 for going out which are facing up half way the hight of the back of the battery and all the holes going out are glued closed except one (BLK/Wht) sticking up 5 inches in the air with no place to go. I put a tester on it and it is ground. the end is bare and it is next to the main fuse box on the fender. It is a big connector about 4 inches diameter. What is it and could that be the cause of the ac not working. grounding it does nothing for the ac.

With the car off the ac pressure for the added R12a is 42. when the compressor is running (from the battery) pumping ice cold air it is only 15. why the difference?

Another item is the bottom of the AC compressor was never cleaned and is covered with thick black dirt. Could that cause the Ac speed sensor to malfunction? and where is the AC amp physically in the car? I checked the relay and pressure switch seem to be fine, New belt and tight. One other small item. The engine was replaced with a 2.0 japan engine. Works great and the air worked after the install and before the accident.

 

The Black/White wire could be part of the relay wiring for the AC.

White/Black wires are typically ground wires.

The amp is on the firewall behind the AC cooling unit.

The dirt should not be an issue. Test the speed sensor, resistance should be 100-130 ohms.

What AC port are you taking the readings from, low side?

Should be 21-28 psi, AC on and set to max cold, blower at high, engine at 1500 rpm.