Cadillac Repair: 1995 Cadillac DeVille 4.9L, number combinations, cadillac deville

Question
The message "very low refrigerant  A/C compressor off" appears on the dashboard display when I try to turn on the A/C to recharge the R134 system, the compressor will not come on and no r134 is accepted.  What do I have to do to get the comp. on so that I can recharge the r134?

Answer
First you need to check for any fault codes in your computers:


1. Engine running and warmed up.

2. Simultaneously push and hold for 3 seconds the OFF and WARMER buttons on your climate control panel.

2. Write down all the letter/number combinations that appear in the EXACT order thyy appear until they stop displaying and let me know what they are.


3. turn ignition off.