Fixing My Air Compressor

[Waz900]

Ok, my A/C doesn't work. The guy I bought the car off of said it was already converted but it just needs a new air compressor. Has anyone ever changed one in their car before? I am going to attempt to do it myself, I am just curious on how much is involved in the process. It seems fairly easy, just a few lines and a few bolts, but nothing seems easy when working on this car. Any hints or comments are appreciated. Thanks!

 

[PuterAmI]

Has anyone ever changed one in their car before?

Once, maybe twice. Let's assume that you have a Fox since you didn't mention it, yet you say the previous owner converted.

You need to determine which refrigerant you are using. Do you know what fittings for R134A look like? They are quick disconnects.

Have the system evacuated of refrigerant. Buy a new accumulator (should be changed out any time the compressor is changed out. I would also get a new liquid line with orifice. These do not cost much, yet clog up very easily. Disconnect the line for the liquid line using "A/C and Fuel Disconnect Tools". Take off the connectors at the compressor. Take off the serpentine belt. Take out compressor.

Turn the compressor over and measure the amount of oil that comes out of it (pout in measuring cup). Replace the same amount into the new compressor with POE oil (I am HOPING that the "conversion" used POE and not PAG). Install compressor. Install lines using new o-rings.

Now, you can rent some equipment, or have the shop do the rest. Pull a vacuum for at least 45 minutes. Charge 80-85% of the R12 total (including oil) which is 42oz for R12. Two cans and maybe a couple of ounces more should get your vent temps down to 40 degrees or so while watching both the high and low side pressures.

For more info, see the below URL.

http://www.veryuseful.com/mustang/tech/general/R12-to-R134A-Conversion.html