FIXED! Car A/C Compressor Clutch Won't Engage

If your Air Conditioning compressor isn't working (the clutch won't engage) then watch this video. The A/C switch on the dash switches the compressor on, with one exception. If the PCM (powertrain control module) senses low pressure in the low pressure fluid line, it will stop the compressor clutch from engaging to prevent any damage. This is because low pressure = low fluid, and r 134a is also oil/lubricant for the compressor and if you don't have fluid then you will damage the compressor. HOWEVER, if you cannot turn the compressor on, you cannot recharge your AC levels (grrrr). So you need to use a paper clip to bypass the relay switch and force the clutch to engage. You can then recharge the freon and re install the relay switch and it will sense more pressure and the clutch will engage by itself.

Category:

Sports

Tags:

• FIXED!
• AC
• Compressor
• Clutch
• Won't
• Engage
• car
• auto
• air
• conditioning
• airconditioning
• compressor
• not
• working
• no
• pressure
• switch
• sensor
• ice
• cold
• bypass
• override
• pcm
• powertrain
• control
• module

[mosadno]

Thank you so much i could not figure out why my comporessor would not engage and hopefully this works I have a Ford F-150 1999 5.4 liter is this fuse under hood or dash.

Thanks Terry

[thevillageinn]

@sephoratrading You really should have read his description.

[savanleon1]

How do you do that to a 2005 ford taurus?

[HyperSTAND]

@ellswortha101 so you connect 87a and 30?

[sephoratrading]

There are usually good reasons why your computer won't engage the clutch on the compressor. Specifically if your system is low on pressure or empty. That combined with forcing a constant-on duty cycle are much more likely to burn out your compressor faster and/or make your initial problem even worse in the end. It is much better to diagnose the problem and fix it properly rather than running your car with paperclips in the fuse box.

[slliks67]

Yup helped me alot, I did this on my 98 chevy suburban and sure enough it worked. After i engaged i heard a loud hissing where the hoses go into the firewall of the truck and they seem pretty loose, therefore the air is not getting in to the cabin. Thanx for the tip

[BAWLS2894]

do all a/c compressers have clutches?

[kamaehu99]

Nice car?? You dont even get a good look at it, not saying that its not,but! Good vid ;)

[bassplayer360mike]

it's 30 and 87...not 87a. 30 and 87a are connected when the relay is off. 30 and 87 are connected when the relay is on.

[j84ca]

Thanks for the tip'.. awesome.