Quote:
Originally Posted by averyislost
I had my AC condenser replaced because I went to get the refrigerant checked one last time, and they couldn't get it to stop hitting the high pressure cutoff and shutting down the compressor early. Said there was a restriction in the condenser. Surprisingly this made an absolute world of a difference. Afterwards, with the 15k ohm resistor the ac completely froze up on me 3 times on our 2 hour drive to the mountains. Outside air temp was 91 with 50% humidity. I had to keep manually turning off the AC to keep it from freezing, the vent temp was getting down in the high 30's. I couldn't believe it. This was with the AC fan speed on 1-2.
I've since moved to using an 18k ohm resistor and haven't had any freeze ups so far, and I'm getting mid 40's vent temps on low 90 degree days after about 10-15 minutes of the truck running. Still using the GX470 condenser fan for air movement at idle.
So at this point, my entire AC system has been replaced. Honestly the only thing that made a difference on mine was the condenser itself. And I had every little bent fin straightened out with the old one, and had washed it multiple times. Guess it really was just junk in the system causing an internal restriction. I'm guessing it was due to previous moisture in the system from the leaky evap core when I bought the truck.
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Wow, ok. I had already had my evaporator and condenser replaced, so it sounds like you did have a different problem. I'm surprised modifying the evaporator temperature reading made a difference at all with a blocked condenser, that's why I thought you were on the right track. I probably should have mentioned that you want to rule out restrictions in the system before going this route, but I guess at the end of the day you now have a way of making your A/C ice cold in the summer when you aren't worried about it icing up. Could be that I just have a drifting evap temperature sensor, but it never got very cold even with the previous evaporator and I would hope the new unit came with a new sensor (the one thing I did not do myself, was just too busy at the time).
I mentioned it in my original post but I probably should have called it out more directly - if you jumper that evap temp sensor with a 2kΩ resistor and the A/C goes from being coolish 55F to blasting ice cold air then your A/C is mechanically sound and the evap sensor is a potential culprit.
Glad you got it worked out!
