SYMPTOMS OF A BAD AC PRESSURE SWITCH

In this video, you will learn 4 symptoms of a bad ac pressure switch. Watching this video will help you diagnose if it is time to replace your ac pressure switch. You will also learn how an ac pressure switch works. This video also teaches you where the ac pressure switch is located. Symptoms of a bad ac pressure switch that you may experience are an engine light with codes P0530, P0531, P0532, and P0533, ac compressor not turning on, ac blowing warm air, and ac not working consistently.

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[easyautofix]

Thank you for watching!



A great car repair manual:
(Use code AD10VA for 15% off one-year subscriptions for any US Order)




Here are some of my favorite items that you might like:

[oralreid]

Thank you very much. My mechanic just told me for $50 what you just told me for free. Keep up the good work!

[tonylafon]

Well replacing a his switch was my issue for the past 5 years I didn’t have ac because of this lol. Thanks

[thebluelunarmonkey]

Older systems use simple on/off sensors that switch between closed and open circuit when refrigerant is out of operating pressure. Newer vehicles may use sensors that signal to the VCM/PCM the exact pressure by variable resistance. I'll talk about the older on/off sensors. The high pressure cut-off switch typically mounted at the compressor is normally closed, so the request for AC from the cabin controls goes thru the high pressure cut-off and to the VCM so the VCM receives the AC request and will activate the clutch relay to engage the compressor. When this sensor detects abnormally high pressures (~380psig) it will open and block the AC request signal to the VCM so the clutch will not energize.
The clutch cycling switch typically mounted to the accumulator is closed at operating pressure (24psig-44psig). When the compressor is activated, it pulls refrigerant gas from the suction line and compresses it to a high temperature high pressure gas (~150psig), which passes thru the condenser and condenses to a liquid. The liquid travels to the orifice/txv which has a tiny opening to restrict flow. On the other side - suction side the pressure is between 24psig and 46 psig so refrigerant flashes to a gas and the conversion absorbs heat so the gas is instantly cold ~33F.
When the compressor first activates, the pressure on the low side is around 44psig and drops as the compressor pulls gas from the suction side faster than the liquid discharges from the orifice. This causes a steady drop in pressure on the suction side from 44psig to 24psig. When the clutch cycling switch detects 24psig, it opens and signals to the VCM to de-energize the clutch relay and the compressor stops working. The evaporator is still cold so the blower motor blowing air heats the evaporator, increasing the pressure of the suction side. As it rises to 46psig the clutch cycling switch closes, signals to the VCM to re-energize the clutch relay.
This process repeats as long as you have the AC on.
The 3rd sensor is the recirculation sensor. It's typically just after the condenser and activates when the high side is too high - but not high enough to activate the compressor high pressure cut-off switch. The only thing this sensor does is tell the VCM to activate the recirculation feature (same as the button in your car) in case the button is set to "fresh air intake" which is typically warmer. This is done to ease the load on the compressor by blowing cooler cabin air over the evaporator instead of hotter outside air. This sensor typically should only activate in very hot weather and with low air flow over the condenser so the condenser is unable to reject enough heat.
A faulty clutch cycling switch does not open in the desired low pressure of 20-24psig OR doesn't close in the desired high pressure of 42-46psig.
A switch that opens too low (~16psi) will cause evaporator freezing.
A switch that closes too high (~65psi) will have reduced cooling since the compressor does not engage before the evaporator warms up. The vents will throw cold air, then warm air, then cold air as the compressor cycles.
A switch that opens too high (~30psig) OR closes too low (~34psig) OR both will cause short cycling - the compressor will only be engaged briefly before it shuts off. The vents will only blow coolish air out of the vents perhaps 65F instead of the desired 50F.

[ryanh]

Its also quite possible that yhe pressure switch is doing what it's supposed to do not allowing the system to work because there's low pressure.

[SERGE_Tech]

dang this guys so awesome such a good video just watched like 3 videos back to back

[QCTI]

Very down to the point video. Professional!!!

[maryfinchum]

Which switch, control's A/C fans, HIGH OR LOW ?

[RosieCramer]

What is the number for the air conditioning switch on a 2011 chevy equinox

[TheSammajor]

Very helpful video just to the target.
One question please
How diagnose blowing hot air with correct amount of refrigerant and compressor engaged.
Pressure 56 / 150 on a hot day and cond. fans are working

[MrAdditdude]

Thanks for the awesome Video

AC works perfect on idle and lower speeds
But Blows hot air on high speeds 120kmph

Changed compressor, got the Condenser and Evaporator checked, got the freon pressures checked. All seems to be good

Some AC Tech said that the Compressor Clutch Sensor might be causing the issue.

Any suggestions plz?

[pasqualeparente]

I have a JKUR 2008, that the A C is always on. I know the AC clutch is not stuck be cause I have seen the compressor turn and the clutch not turn.

[vesseleightyseven]

Thanks bro! That's what it was ❤️

[alieyesonme]

YOU MAKE THE BEST VIDEOS BRO YOU'VE HELPED ME SO MUCH THANK YOU

[jlbrown]

I have requested about my AC. And my 2013 Mercedes-Benz the AC is blowing cool then as it gets warmer through the day, it starts blowing hot air here and my compressor is coming on and it’s not shut off cause it blow cool. and it is full of Freon.!

[johnnywadd]

Hi can you do some videos on OBD2 drive cycles and how to diagnose why the monitors won't set ready

[trfisher]

I have a 2011 F250 that I bought used in 2018. I never had any AC problems and I've never added any refrigerant. Recently it quit cooling. If I put it on max cool it will eventually come on after 10 or so miles of continuous driving. I thought maybe it needed charging so I bought a can of refrigerant and connected it to the low pressure side. I DIDN'T ADD ANY REFRIGERANT, but the gauge read nearly 90. The ambient temperature was about 78 degrees F.

[joedunmore]

I have a 2012 Jeep grand cherokee limited 5.7 . I went through 5 radiators before I realized that using the ac crack them. I talked to a few mechanics and they keep telling me that that shouldn't happen. I don't know what to do.

[bobp]

thanks so much. I think this is the problem with my 2018 mustang.

[kristenstillstanding]

My AC is blowing out hot heat. Where are you located? I need help getting my AC back working.