AC Clutch staying engaged all the time

Hi Joe,

Thanks for the information. Actually I just let the air out and recharged only at the low side. That’s the way I’ve always done it and never had issue with most of the vehicles I’ve owned. Air is very cold, I put right about three smalls cans of
Freon in it as it holds I think about 34oz. I am sure it’s over charged a little right now too. I had it at a garage yesterday and they suggested it was the high pressure sensor but I’ve had people tell me it was bad compressor that would cause that too. I will try and change the high pressure sensor first and see if that solves it.

Thanks again.

Hi again, I’ve not replaced any sensors yet but I’ve took both out and cleaned and when I hook them back up, the clutch works as it should, but when the pressure rises it seems it doesn’t kick back down. Could this actually be a condenser fan/ condenser blockage?

My father in law says my compressor is failing, he says it isn’t pumping the pressure back down. I don’t really understand all this other than what I’ve been researching.

Had someone tell me it was an ambient sensor too. I’m now having heat on driver side come out and cold come out on passenger when ac is on. Happens about a minute after it’s been on.

Also had pressures checked yesterday with manifold gauges and the low side read about 45 to 60 and the high was 225 to 250 and it was about 75 degrees.

I’ve lost a lot of Freon. Due to pressure rising and blowing o rings. If I release some of the pressure it will work until it gradually builds more up. I’m stopped up somewhere just not exactly. Probably going to replace that sensor and clean the system.

Would the A/C still be cold continuously?

What about condenser radiator? Would it be wise to check there as well? I have a new low pressure/cycling switch and a high pressure transducer switch on the way to replace and try first. Just really odd. I’ve never see one still get cold and do that.

Can you explain to me what makes a compressor actually start the pump down cycle? Does it cycle up and then just kick off and release the low pressure on its own or what exactly?
Sorry for so many questions just trying to understand all the AC components and workings of the compressor itself.

How about the low pressure/cycling switch. Is that actually what signals the compressor to engage and disengage the clutch or does the compressor do that on its own?

Sorry it has taken me so long to reply, but this is what I’ve done so far. I’ve put new Freon in it, a new high pressure sensor, cycling switch sensor the one located on the accumulator, changed orifice tube.

It still doesn't kick off. These are some other issues I’ve found, no matter what temperature I set my A/C too it doesn’t change. If I turn A/C switch off, and set temperature to 90 I have heat coming out of only front vents and bottom because If I turn defrost on it kicks my compressor in. Heat will eventually come out of passenger side vents with A/C on if it’s been set there awhile. I’m thinking this could be bad actuator switch under the dash. Could this cause evaporator to freeze and keep compressor from kicking off?

We went on a trip for the weekend and I drove this truck and ac was real cold had no in between and sometimes it felt as is if it had moisture in it. Got to where we were going and I heard ice falling from Evaporator core. Water drips from bottom of truck at fast steady pace. If it idles more than 15 minutes starts blowing warm unless you idle it up some. The fan is working as well

Is it also possible that A/C cycle switch I put on is bad?

I’ve researched into ambient temperature switches and there is quite a few temperature switches on the truck and I don’t know what all actually sends the signals back and forth to let the compressor cycle other than that switch.

When I unplugged the compressor it didn't come back on when I restarted it. It will turn on and off with switch and if you unplug the cycle switch it will also kick off as well but as soon as you plug it back up it never disengages no matter what temperature it is.