Very helpful Jim! going to tackle the AC this weekend
I would like more details on operation of the EPR as well. From my limited understanding, it appears that this is a back pressure regulator that opens or closes based upon feedback from the Expansion Valve feedback line.I read Jims article a few times, and in it he states that the epr is adjustable, but I can not find any way to adjust the epr in the tsrm. Does anyone here know anything about adjusting the epr.
Thanks for Listening. Semper FI
Thanks AJ, I did a bit more work on it today, tweaked the pressures a bit, and was finally getting 37 degrees at the center vent, it was 94 degrees and humid here today, so I feel like the Condenser is probably doing all it was designed to. Cond fan was going on and off as it was supposed to depending on whether I was moving or at idle. So I am fairly well satisfied that the car is performing just like I remember my 83 did back in 83 when I bought it new. It was designed for R12, and it is now running great back on R12. Whoever had it before me, really mucked it up, by adding 134a, magic freeze, dye pack and a sealer, oh and 10 oz ester oil. No wonder it didn’t get cold. And they never really converted anything over to run on any of those refrigerants. That is why I made doubly sure that the system was clean inside all the components, and replaced certain components before putting the right stuff back in. All that being said, Even though I am getting great airflow through the vents, I suspect you may have a point about looking into the ductwork, as you could hang meat in the glovebox, after an hour of driving with the ac on. I may have to pull that down again, and have a better look at the ductwork near it.Supy, Those temp #s are pretty dang good!! I would look into modding the condenser fan better CFMs, cleaning out and sealing the air ducting inside the cabin areas!!
Nice discussion Sir!!
Arch,Chris here's the link to the A/C tune up FAQ I posted a while back...
Here's my quick A/C tune up I wrote up a few yrs ago...cheap way to see if the R12 system is operational...
Dang it, I don't know if it's just me and my abysmal computer skills, or if the link you posted is dead, but is this the link you are referring to?
This is really useful.