Cadillac Repair: 87 CADILLAC DEVILLEC A/C, mechanic friend, code combinations

Question
I HAVE A 1987 CADILLAC AND DO NOT KNOW HOW TO FIX THE A/C. WHEN I GOT IT, THE MAN SAID THAT HE HAD JUST PUT $200 WORTH OF WORK IN IT, INCLUDING A NEW CONDESOR. ME AND A MECHANIC FRIEND OF MINE TRIED TO REFILL THE SYSTEM BUT THE COMPRESSOR WONT KICK ON, WE THEN WIRED THE COMPRESSOR DIRECTLY TO THE BATTERY, IT WOULD TURN ON AND THEY GET THE WIRE EXTREMELY HOT. THE COMPRESSOR TURNS ON ONLY WHEN U WIRE IT DIRECT. ALOS THE DISPLAY IN THE CAR STATES THAT THE OUTSIDE TEMP IS -40 DEGREES. I GUESS THERE MIGHT BE A SHORT BUT AM NOT SURE WHERE TO START IN TROUBLESHOOTIN AND FIXING THE PROBLEM.

Answer
You need to check your computers for fault CODES.

1. Ignition ON. Engine OFF.

2. Simultaneously push and hold the OFF and WARMER buttons until the whole display illuminates and release the 2 buttons.

3. fault CODES will start to appaer and stop at .7.0

4. Write down the LETTER/NUMBER code combinations EXACTLY as they are being displayed.

5. Turn ignition OFF.


Let me know what codes you get.



tom