A/C blows no cold air?

Hello,

I have seen this problem before the AC compressor clutch coil/compressor needs to be replaced. Here are two guides to help walk you through the repair with diagrams below to show you how on your car:

https://www.2carpros.com/articles/replace-air-conditioner-compressor

and

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Check out the diagrams (below). Please let us know what happens.

Good afternoon Kelda,

I am assuming that you took this vehicle into a repair shop to have it charged, correct?

The behavior you describe almost sounds to me as if it were overcharged. Would it possible to take it back to the place that did the A/C charge work and just have them check the pressures?

Regards
Jon

Hi Jon!

I checked the pressure myself and it had said overcharged so I took it back to have it looked at again and they redid everything while changing o-rings and hoses as well. After this trip is when the A/C started working intermittently still.

Thanks,
Kelda

Ah, That's a fairly common occurrence these days with those DIY kits they have out now.

My colleague Ken (who obviously was typing his reply to at the same time as I =)) suggested that the clutch may be faulty on the compressor. Which is certainly a possibility. But before diving into that I would check into the pressure switches.

Most vehicles these days have two safety switches. One for the high pressure side, and one for the low pressure side. The low pressure switch prevents the clutch from engaging when there is not enough refrigerant in the system to prevent damage to the compressor. The high pressure switch disengages the clutch when the pressure reaches a pressure set by the factory. This is also to protect the compressor and other hardware.

I would have those looked at first and then look at the clutch as Ken suggested.

Regards
Jon

My air conditioner hasn't worked for years so I finally took my car in for the repair. Well it still is not working properly...the cabin of the car is not getting ice cold like I know it should be. They did not replace the dryer although it was recommended. They did a a/c inspection, a/c evacuate and recharge. system caps. a/c dye, schraeder valve. and put in R134 freon. On the performance test my car was labled average at 58 degree temperture. Front vent tempertures at 55 and gauge pressures at 110 high and 22 low. Does this sound right to you and what do you think I should do.

THe system sounds like it is not charged completely. Here are two guides and a video to help fix it.

https://youtu.be/uZrQCGwXfek

and

https://youtu.be/4EqdrBVb0sY

and

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Please run down these guides and report back.

i am not feeling any cold air coming from my air codition?i would like to know why?

Hi there,

Often this will be low refrigerant normally due to a leak, you will have to get this check first.

mark (mhpautos)

The AC works normal for about 15 minutes. Then the compressor shuts off . The inside fan blows hot air. The evaporator fans work. The compressor clutch doesn't engage the compressor. The car has to be turned off for half hour before the AC clutch engages the compressor again. Then all works normal for another few minutes. The relay has been replaced with a Honda part. The thermostadt inside the evaporator has been replaced with a Honda part. Originally, I believed the system was over charged causing the high pressure switch to turn it off. I released a very small amount of freon (yes in to the air), and all worked OK for a few days, then started doing it again. I released a little more until it didn't cool well, and then added a small amount back so it would. It has not been evaluated by a professional nor been on a real recharging station. Any ideas please ?

I would check the AC pressure switch and diode before sending the vehicle to an AC recharging service.

We are having problems with the compressor coming on. We have checked all the fuses and they are good. We also hooked the compressor up directly to the battery and it came on. What do you think the problem might be.

Hi EliMo50,

Did you check the clutch relay? Try swapping them.

When AC is turned ON, compressor does not catch but do the fans start working? Here is a guide to help you test the relay and the location of the relay below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what happens.

Cheers

You are a genius! the relay has bad once I replaced it the system started working thanks!

Nice work, we are here to help, please use 2CarPros anytime.

Cheers

I'm have an AC problem on my car where it just blows hot air. Initially I thought it ran out of freon, but I went to Sears Automotive to get it refill they were not able to get it to charge. I wasn't sure what they said, but they mention when they went to charge AC the compressor would not kick on. Please can you direct me in the right directions for troubleshooting.

Thanks,
Tim

Hi Tim, Thank you for the donation. You need to check if power is being supplied to the AC compressor when when AC is turned on. Does the cooling fans comes on when the Ac is turned ON? If no, you need to check the AC compressor relay and fuse.

Fuse # 34.

If fans comes on without the compressor working, the compressor clutch could be faulty. Disconnect clutch wire and apply battery voltage, clutch should click.

Yes, your information help me diagnosed that the AC Relay was bad. I replaced the Relay and now I have AC. Thanks 2CarPros you were a great!!

You are welcomed and glad to be of service.

Thank you for using 2carpros :)

Have a nice day.

Changed compressor, vacuumed system, no leaks. Hooked up gauges and put in oil charge. Tryed to put in freon low side went to 110 and high side went to 100. Compressor would not kick on. please give me an idea where to start checking. Compressor is from salvage yard.

did you try jumping pressure switch?

No I haven't tryed that. I will as soon as i can.

I tryed to find the pressure switch but having difficuly locating it. Please give my an idea where it may be.

Have you tried to jump power directly to the comp to prove that the clutch and comp are functioning?

So I was driving on the interstate and suddenly, fog or something came through my vents and my air conditioner stopped working. However, when I turn the air conditioner on the clutch does seem to engage and I lose a little bit of power.

I tried to buy the manifold gauges to read the pressure but they were cheap (harbor freight) and just ended up emptying the system. And the clutch stopped kicking on after the 134 was evacuated.

I returned the gauge set as I went through two and they just emptied my system due to leaks in the high and low lines.

Should I just switch out the evaporator and thermo switch and I would have no question if it would work? Or could it be something else.

Thanks!

well it needs to be evacuated and recharged first then it's probably something else like a pressure switch or an actuator has gone bad and closed so you don't get cool air inside car.