Now that my car is driveable, I’m looking into fixing the whole A/C system and getting it back to working order. I’ve never messed with AC, and I was unsure of how to proceed, hopefully I can get a better plan once I lay out all the issues I’ve got.
First off, I’ve got to take apart the dash, get in the heater core box, and replace the heater core and find out why my blower motor doesn’t work. I’ve got some vacuum lines that aren’t where they say they should be, and some wiring to the compressor that the PO put in, so I’ll have to look at their handiwork and see what they did. My heater core seems to leak a bit, and the box had the drain hose plug kicked off of it before I got it, so I’ll have to fix that and stop it from draining right into the passenger footwell.
While I’m in there I’ll look at the evaporator, and see how it is, not sure how to test if it’s still good or not. I’m hoping that the heater core isn’t cracked, I can braze it if need be though. If the evaporator is not airtight, is there a point in trying to fix it? I would think with the pressure that goes through it that it wouldn’t be worth trying to fix it over and over if it doesn’t go right. Other than the evaporator, I’ve got some lines from the PO that don’t seem like the best, the fittings aren’t crimped on, they are in the hose with hose clamps very tight, so I may have to replace some lines. When I got the car it came with a Four Seasons 57034 Compressor, I was looking around and I assume thats an R12 model correct? I don’t see anything that looks like an R134a conversion, although I’m not sure what all goes into that.
That’s another thing I’ve got to choose, if I want to convert to r134a or stay with r12. I’m in southern california, so it gets pretty hot for at least half the year, and the stringent emissions here would probably cost quite a bit to get r12. I was looking through here for info and I saw someone mention that they use “FR-12” and had a link to it, would that be a suitable replacement for R12? It is advertised as a replacement for R12, however I was hoping someone else here might have some insight on that.
I’ve got a new condenser and drier from WCCC, so in terms of parts I believe I have everything, just not sure which parts to modify or how to check them. I took off the suction and discharge lines from the compressor, it had been sitting a while, and when I took them off, one side (I believe the suction) had what looked to be some oil dripping through. I tilted it around and no more came out, just the little that was sitting in the line. I spun the clutch to see if it would suck and blow and it does, the pulley spins fine and the clutch is a little hard to turn, not sure how hard it should be, but it takes a little effort. I’ve also got a spare York compressor somewhere, I’ve not messed with that since it was a leftover from some other car I never worked on.
So in parts, I’ve got a stock evaporator to check, a heater core to fix a leak on, a heater box to fix the drain plug, blower motor to inspect, some questionable AC lines, a Four Seasons compressor that I believe is still R12, and a new condenser and dryer.
Any advice or experience would be appreciated, my current plan is just to fix the fan and heater core, and then hopefully keep the system as an r12, or that FR-12, but I’ve got no real clue how to go about all that.
edit: just looked over that four seasons compressor, it says to fill with 6oz of PAG oil, which I thought was only used for r134a? The oil that came out was a yellow-greenish looking oil.