Ok, how cold should the air be coming out the main vents, I have a 96Z and can not get the thing to cool the inside around town, I'm getting about 50-54 degree air around town, on the open road it gets cooler. I know this cars are hard to cool, I got the windows tinted and that helped, the compressor pressures are good, I was wondering if anyboby is getting these cars to cool better, or is this something I have to deal with.

 

Temps out the center vents depends on the outside ambient temp and humidity. shoebox has an AC performance chart on his site, but 50-54 on a 90+ degree day sounds good to me. The chart in my helms shows it needs to have even higher low side pressure for my car.

 

Is that on the Max setting or the A/C one?

 

thanks for the information, I though that would be as cold as it gets.


thanks scott

 

i never used a thermometer, but the air in my car is so cold, that your teeth start chattering, even on 100 degree days, and my car is black with black leather

 

Whats a/c...? lol i took all my ac stuff out a long time ago, i still have it if you or anyone else wants it, still worked fine when i took it out and it was recently recharged before that, its out of an 84 though

 

I was having a problem with mine a week ago. About 1 hour into a trip, the A/C would start warming up until I'd get frustrated and just turn it off.

The air output seemed to decrease as it got warmer, so I said "ah-ha." When I got to my destination (after running the A/C the entire time), I looked under the car. Water was POURING out of the heater box. For minutes on end. I'd say my evaporator was frozen.

This can happen when the refrigerant charge is just low enough (it's kind of a sweet spot before the A/C gets really mediocre all the time). So I added some and it seems to have fixed the problem.

If you use MAX (recirculate) and give the system enough time, my evap temp (as reported by datamaster) will get right down to the compressor cutoff temp (36°), even when it's 90° out. But you have to get the interior cool first. It won't bring 90° air down 50°. Usually the delta is around 30°. Once the interior temp gets lower, then the 30° drop that the evaporator is capable of will result in cold vent temps, because it's starting with 75° air, for example.

The turn-off temp of 36° is about as low as you'd want to go to avoid icing up, I've found. If the fan is on low, even though the compressor shuts off at 36°, the evap can get as low as 33° before climbing again.

I also changed the compressor turn on temp from 39° to 37.5°. I found that even though the compressor turns on at 39°, the evap was getting as high as 45 or 46° before coming down again. Turning it back on at 37.5° keeps it from going much higher than 41 or 42°, which keeps average vent temps colder.