How do you remove and install a air condition compressor for a 1990 Cadillac Deville 4.5 V8 and front wheel drive?

First you have to evacuate and recover all contents in a/c system using EPA approved recovery system(s).[Please note however that if you are replacing the compressor you also need replace the accumulator,the reason being that the desicant bag in the accumulator is more than likely over saturated with freon]. Raise and support vehicle on jack stands.Disconnect negative battery cable and release tension on serpentine belt.Unplug electrical connector to compressor ,remove a/c lines from compressor;also disconnect lines and connectors from the accumulator.Remove compressor mounting bolts,while noting the locations of all bolts and/or brackets.Installation is the reverse of removal.Be sure before installing new unit to pour about half of the new pag oil into compressor and hand compressor clutch(not the pulley)about 10 full turns.After installing comp and accumulator evacuate(vacuum)system to remove any air or dust particles that may have gotten into system during installation[vacuum at least 30 min].Recharge system with specified amount of refrigerant and remaining pag oil.TWO NOTES OF CAUTION NEVER OPEN THE HIGH SIDE(SMALL HOSE)OF A/C SYSTEM BECAUSE OF EXTREMELY HIGH PRESSURE!!!ALSO MAKE SURE THAT YOU USE NEW O-RINGS WHERE APPLICABLE AND NEVER REMOVE A/C COMPONENTS FROM PACKAGING UNTIL YOUARE READY TO INSTALL BECAUSE OF THE RISK OF DIRT AND AIR CONTAMINATION!! I

First you have to evacuate and recover all contents in a/c system using EPA approved recovery system(s).[Please note however that if you are replacing the compressor you also need replace the accumulator,the reason being that the desicant bag in the accumulator is more than likely over saturated with freon]. Raise and support vehicle on jack stands.Disconnect negative battery cable and release tension on serpentine belt.Unplug electrical connector to compressor ,remove a/c lines from compressor;also disconnect lines and connectors from the accumulator.Remove compressor mounting bolts,while noting the locations of all bolts and/or brackets.Installation is the reverse of removal.Be sure before installing new unit to pour about half of the new pag oil into compressor and hand turn compressor clutch(not the pulley)about 10 full turns.After installing comp and accumulator evacuate(vacuum)system to remove any air or dust particles that may have gotten into system during installation[vacuum at least 30 min].Recharge system with specified amount of refrigerant and remaining pag oil.TWO NOTES OF CAUTION NEVER OPEN THE HIGH SIDE(SMALL HOSE)OF A/C SYSTEM BECAUSE OF EXTREMELY HIGH PRESSURE!!!ALSO MAKE SURE THAT YOU USE NEW O-RINGS WHERE APPLICABLE AND NEVER REMOVE A/C COMPONENTS FROM PACKAGING UNTIL YOUARE READY TO INSTALL BECAUSE OF THE RISK OF DIRT AND AIR CONTAMINATION!! I

DROP THE TWO FRONT CRADDLE BOLTS ,,,,,THE CRADDLE IS WHAT HOLD THE MOTOR IN THE CAR FROM THE UNDER SIDE,, THERE ARE 4 BUT DON`T DO THE BACK ONES AND IN SOME CASES THE L FRONT DON`T TAKE IT AQLL THE WAY OUT ,THE R FRONT SHOULD DROP DOWN FAR ENOUGH TO GET THE BOLTS EASY AND YES DO WHAT THE SAY ABOVE TO DO THE JOB RIGHT IF NOT YOU WILL BE DOING IT AGIN MAKE SURE YOU FLUSH ALL LINES AND THEY MAKE A AC FILTER THAT WORKS GREAT TO THAT INSTALLS EASY