EEVEE

So i am monitoring my ac output basically these few months, And such as today with 93 degrees and 91% humidity i got it down to 58 degrees on full blast and on lower speeds down to 65 on 3, 58 on 2 and lowest speed i got down to a chilly 53 degrees at idle. Would this be normal in these conditions? it seems to wave around 60 to 45 degrees on given days and conditions. driving i got it to 55 on full blast and lower speeds down to 43 degrees and on the lowest 40.

nickfancher1

4.3L XJ

91% humidity is a lot of heat exchanging going on. There is nothing wrong with it

kbeam418

Full blast in 80+ temps should be 50 f MAX. Fan on low speed the temps should be around 40f. Anything higher than 50 f means the A/C isn't performing well. I would check the low and high side pressures and clean the condenser! I just cleaned the radiator in my mgm and that made a pretty large difference for outlet temps. So much so that the compressor will actually cycle and the e-fan isn't running at full speed. According to my uncle, who is a journeyman hvac tech, you should get 40-50 temp drop at the vents. So if it's 90 out the outlet temp should be 40-50 (with fan at high). I miss cars that used r-12 that would freeze you out!

EEVEE

i actually had the liberty of experiencing an r-12 system and my god that puts r134 to shame it really does.... But you think so? i know i gotta keep refilling this every once in a while and i know i got a small leak but i just dont have the time nor energy to tear apart the system and replace seals and whatnot im fine with putting a 2 dollar can in and keep going. I monitor the low and high sides with a gauge set and the numbers are where they should be and overlooked by my dad whom is also an hvac expert coincidentally enough lol. I tried it on my step moms car and hers got to 63 on full blast and she has a brand new hyundai sonata so cant be an issue with the system already lol but my dads blazer is colder by 2 degrees than mine.

4.3L XJ

What year is it?

EEVEE

99

4.3L XJ

OK, just wanted to know if it was fixed orifice or not for a metering device

OldTires

If you have a leak, there is a good chance moisture is getting into the system and the oil can only absorb a certain amount of moisture so after a while the system will not be able to get as cold as it used to, even with the correct pressure numbers. It happens.

4.3L XJ

There are also other issues with R134A also. It is a blend of several refrigerants. The lighter ones are able to pass through regular hoses. The lighter refrigerants leave the system and the heavier ones remain, thus making it less effective by being warmer when it is passed through the orifice and becomes a gas. A true "conversion" needs to have the proper hoses and O rings

kbeam418

If it keeps you cool that's all that matters. Full blast temps will be higher than at low fan speeds, once it gets above 90 and high humidity the output temps will be around 50-f. Make sure to use re-circ also that helps the ac out alot.

MonacaYankee

Full blast r12 ac in my old Mazda/ranger Single cab pickup puts my jeeps Ac to shame.

4.3L XJ

Best AC I had was when I was in the AC business. I just put whatever was handy in it. R12, 134A and a propane/butane blend. Perfect 36° air on high

kbeam418

I had a 93 Cavalier when I got my driver's license that car was a total pos but the a/c outlet temps were in the negatives! Of course the problem with air that cold is the evaporator coil would ice up after half an hour or so. She might have a bad head, leaked every fluid and got 10 mpg but at least you were never hot.