Today was the big day. The plan was to rebuild the AC system on the XTC. Here's a list of all the parts:
Remanned V5 compressor - 47.95 off E Bay
R134 control valve - 78.00 from Rock Auto
Normal Service - Variable Orifice tube - 19.99 - Autozone
New Accumulator - 19.99 - Autozone
New high pressure switch w/new connector - 35.00 - Autozone
New low pressure switch w/new connector - 24.99 - Autozone
16oz PAG 100 oil - system uses 11oz - 15.00 - Autozone
3 12 oz cans of R134 freon - 24.00 - Autozone
Nice Cold AC in a black car = Priceless!
I also bought a electric 2.5 CFM vacuum pump from Harbor Freight. It was the floor model so the Manager gave it to me for 40.00 - regular 90.00. I had been using the 10.00 air compressor version but thet electric one works so much better. I am always messing with AC so it will pay for itself. So without the vac pump, I got about 250.00 in parts and goodies.
I removed the old compressor, removed the old accumulator and orifice tube, flushed the lines and blew them out with a lot of air. I found several bad spots in the wiing for both the hi and lo switch's. The majority of the time spent was fixing the electrical issues. After looking at it, I noticed that where the wires come down behind the water pump (duke), they are fairly close to the exhaust manifold - probably why all the wires and the plastic loom was so hard and brittle. I replaced all the wires, installed new plastic loom and used "Simmons" High heat spark plug boots made from nomex to cover the lower end where it runs close to the exhaust. They come in sets of 2 so I put the other one on the starter cables to protect them. They work very well. I installed the new switches and the control valve in the compressor and filled the comp with oil. I put half in the compressor and the other half in the "suction" side of the accumulator. I buttoned everything up and put the new vac pump to work.
I let the vacuum pump run for a few hours then I closed the valves and let it sit for an hour. The cool thing about the electric vac pump is that you can see it pull the moisture out of the system. Once I new it would hold good vacuum, I opened the valve on the first can (1st one I put in has dye in it). I let the system take as much of the can as it will without starting the car. Then I check for leaks around the fittings up front and at the compressor. When I'm sure there is no leaks, I start the car and feed the rest of the 1st can into the system. With the 1st can in, I was already getting 75* air at the vents. Toward the end of the 3rd can, my pressures were around 30 on the low and 230 on the high. I put a large fan in front of the car to get some air moving over the condensor and I was able to get 46.7* air out of the center vents. Good enough for me!
Bad Wires!




And my new vac pump & setup ready to charge:

I took it for a little drive and going down the highway @ 70 mph I am gettin 46* air out of the center vents. Sitting at a traffic light it blows 50* air. I have an air flow issue in the front of the XTC right now. I can't wait to get that issue fixed to force more air into the radiator. One other thing I found was that where the 2 tubes go into the firewall, they were leaking cold air. The factory goop that is there to seal it off was hard and crumbly. I used some silicone sealer to seal them up and it made a noticable difference inside the car. It was like getting one higher speed on the fan!
I also think I broke my wrist getting the old compressor out but that's another story.........
More later!
Pat