Posted by JDEM on January 01, 2018 at 06:40:07 from (174.230.17.38):
After a lot of abuse, I finally put my truck in my shop for a lot of work. 1994 Ford F250 4WD turbo-diesel 7.3 IDI (NOT a Powerstroke). No rust, no winters. Had 200,000 miles on it when I got it and now has over 400,000 miles. Engine (IH-Navistar 445 c.i.) still runs like new. A lot of new front steering parts including a new steering box and power-steering pump. New brakes, rotors, calipers, wheel cylinders, master-cylinder, rear axle seals, etc. Put new solenoid-pack in the E40D trans. Lots of parts problems along the way.
So - had it in my shop longer then planned. The closer I looked the more things I was finding wrong. Took it out for a test drive. After I used the brakes four or five times, I lost all power to them like the vacuum-booster went dead. Let it sit for 5 minutes and they worked again. I assume the vacuum-pump is bad. One of the few things I never changed on this truck.
So I ordered a new vacuum-pump from Rock Auto. In the mean time I decide to do something "easy." That is . . some wiring. I want to add a 600 watt DC to AC inverter under the dash. Should be easy, right? I needed to run some 8 gauge wires from the inside of the cab (under the glove compartment) - to the engine compartment. I measured carefuly (I thought) and drilled a hole just above the carpet on the floor. BIG MISTAKE !! Big woosh and oil and AC refrigerant spraying all over the place. I drilled a hole right into the AC evaporator. I still cannot believe I did this.
So, the AC is one of the things on this truck I have never touched. It has worked amazingly well for the 200,000 miles I have used it. Better then in my newer vehicles. I always assumed that because it was an old R12 system.
Now I find out it was converted to 134A. So, I have AC system oil all over the floor. I have to put in a new evaporator and have no idea what system oil was in this thing?
Note - this system worked great before I destroyed it with a drill. No need for improvement. I just want to get it back to the way it was. Back in the days when R12 to 134A was common - we had to use ester oil. Newer systems use PAG. Original R12 systems used mineral oil. I have to add oil to this system and it has to be - I guess, one of three choices. Ester, PAG, or some stuff I never heard of before called "double-end capped PAG." I wish there was some way to tell what the old oil is that is all over my floor right now.
Pretty good mouse nest around the evaporator. Amazing it worked so well.
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