Thread: A/C button no longer turns on compressor. Ideas?

Well the high and low are connected, but there are valves in the compressor that impede flow, and depending on the car the expansion valve.
So its faster and safer to pump both sides.

https://www.ackits.com/

Looks like a good place to get the new R134 o-rings instead of paying a bajillion bucks from the stealership. They have some other good stuff on there too.

My ac has been weird, it's been working OK but today when driving as soon as water temps hit close to 200*F, the AC started being too warm. The water temps are thanks to the AC .

My AC Manifold does not allow me to charge the red side, I bought the cheapest one Autozone had, and now am regretting it. It's made for people that can't attach the AC can directly to the low pressure line . I might score myself the Harbor Fright tools one.

Now when I connected the manifold yesterday night it was pretty hot, it was showing about 55 PSI low side, and 130ish PSI on hot side. AC was not blowing cold air, after I disconnected the high line it let some pressure go and AC started blowing cold.

R134a is very sensitive to over charging.
How much freon did you put in vs what the plate on the hood said ?
Typical overcharge symptoms are not working at idle, but good at freeway speeds when condenser is cold and the compressor turning at high speed.
Best example I can give you is the new Sunny I had. ( see avatar)
Took this in because it was very poor at idle. friend had same yr Sunny, his was fine.
They said nothing wrong, they checked it. I lifted the hood and felt the Low side line it was hot !!!
I lost it and shouted at them ( not good, this was Singapore) and demanded to know what the pressures were. They didn't know, so obviously they didn't do anything.
They then took it in the workshop in the shade, put it on re-circ and reved it up with a thermometer in the vent, I opened the windows and put it on fresh air and started shouting again.
upshot was they found a real A/C guy, he measured the Freon at 0.61 spec 0.5 +-0.05
So it was only over 0.06 (Kg or lbs, not sure now.) less than 20% from typ and 10% over the max.
They recharged with the correct amount and off i went. No issues for 2 yrs till I sold it.

I think that must have been Kg's

this site is great, Thanks !!
dryer for $13 !! vs $43 at Autozone!!

I've noticed that, 1 psi over the green line and no longer blowing cold air.

Now they keep on showing charts that say if the temperature is XX*F then PSI must be between XX PSI and XX PSI. So what it seems is happening is, as soon as it gets warmer, the PSI goes up thus the compressor stops working.