1998 GMC C3500. The AC compressor clutch won't engage. Checked the refrigerant pressure, 40psi @ 77˚. Checked the fuse in the box on the side of the dash as well as under the hood. Checked the AC Relay (switched it with the starter relay). No power to the electrical connection at the clutch.

Question 1

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2answers

1994 chevy k1500 ac compressor not getting power when i turn ac on

In a 1994 Chevy K1500, the compressor should receive power when the AC button is turned on, assuming that the system is adequately pressurized and there are no other issues preventing it from engaging. Here are some steps to diagnose the issue:

Check Refrigerant Levels: Low refrigerant levels can prevent the AC compressor from engaging. If your system is low on refrigerant, it may need to be recharged. This is typically a job for a qualified technician.
Check for Refrigerant Leaks: If your system is low on refrigerant, it's essential to check for leaks. A leak can cause the refrigerant to escape and prevent the compressor from engaging. Look for signs of oil or refrigerant leaks around the AC components.
Fuse and Relay Inspection: Ensure that the AC system's fuse and relay are functioning correctly. You can consult your vehicle's owner's manual or a fuse box diagram to locate the relevant fuses and relays. Replace any blown fuses or faulty relays.
Check the Pressure Switch: Many vehicles have a high-pressure and low-pressure switch in the AC system. These switches monitor the pressure in the system and can prevent the compressor from engaging if the pressure is too high or too low. Check these switches for proper operation and continuity.
Inspect Wiring and Connectors: Examine the wiring and connectors leading to the AC compressor. Look for damaged wires, loose connections, or corrosion. Ensure that there is no damage to the wiring harness.
AC Clutch and Compressor: If all the electrical components are working correctly, you may need to inspect the AC clutch and compressor itself. The AC clutch should engage and disengage when the AC is turned on and off. If the clutch isn't engaging, it may be faulty, or there could be an issue with the compressor itself.
Refrigerant Pressure Sensors: Some vehicles are equipped with refrigerant pressure sensors that can prevent the compressor from engaging if the pressure is out of the specified range. Check if your vehicle has such sensors and test them if necessary.
Professional Diagnosis: If you've checked all of the above and cannot identify the issue, or if you're uncomfortable working on AC systems, it's recommended to consult a qualified automotive technician or AC specialist for a thorough diagnosis and repair.

Remember to prioritize safety when working on your vehicle's AC system, as it involves high-pressure refrigerant and electrical components. If you're not experienced in automotive AC repairs, it's best to seek professional assistance to avoid injury or damage to your vehicle.

Sep 03, 2023 • AC Cars & Trucks

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Ac not working, air compressor clutch not engaging

Hi Adeyeri

Keep in mind that the Clutch won't engage for a few safety reasons.

Temperature inside vehicle
Temperature of compressor or pipes
Pressure inside pipes
Compressor jambed
Eg It's out of refrigerant Gas

You can momentarily engage the clutch by simply giving it +12v to the wire attached to clutch. Usually has a connector close by.
Or
If it has a Relay (click) in fuse box
You can by pass it with a jumper

A quick engage & disengage should allow you to detect possible problem.
But don't over ride the built in safety for more than about a minute.

Cheers
Hope this Helps

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FIXED Car Compressor Clutch Won Engage

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Feb 23, 2016 • 2002 Infiniti QX4

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97 chevy suburban AC clutch won't engage pressures

Looks like the low pressure switch gets power from a 10amp ac fuse. Power then goes to the ac relay which is powered on by the ac heat controller on the dash. Power then goes thru the high pressure switch to the compressor. The ac relay is grounded to the body. Do you have power on the lite and dark green wires going into the relay and is it grounded ?

Jul 26, 2013 • Cars & Trucks

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2009 chevy travse ac clutch will not engage

The Trainer 40 When the compressor won compress

Nov 10, 2012 • 2009 Chevrolet Traverse

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1answer

1998 dodge ram1500 airconditioner clutch not getting power

You may just be low on refrigerant, if the system is low the compressor will not engage, the oil that lubricates the system is carried by the refrigerant as it is pump around the system, so if it is low the compressor will seize up, so it is shut off by the low pressure sensor switch. To confirm this is the problem have a shop that repairs AC systems run a pressure test on the system with a set of AC pressure gauges. If it is low you have a leak, it must be repaired before it is re charged.

Jul 17, 2012 • Pontiac Grand Am Cars & Trucks

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1answer

1991 Mercedes Benz AC Cycling Switch /Compressor Clutch Won't Engage Completly Spins 1/6 of a complete spin repetedly then stops

You need to have the refrigerant charge level checked, it sounds like it is low. You Need a set of AC pressure gauges to do this testing. If the system has a low charge the pressures will be very low in the low side testing port.

Jun 26, 2012 • Cars & Trucks

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2answers

Ac problem no voltage to ac clutch on dodge caravan 1999 3.3 eng

If you do not have enough refrigerant in the system. The low pressure switch will prevent the compressor from engaging to avoid damage.

Check your pressure.

I don't recommend this, but you may need to jump your low pressure switch to get the compressor going to add more refrigerant to the system. But if your low on charge, it may be "best to take it to a shop to have them fill the system".

Jun 09, 2011 • Dodge Caravan Cars & Trucks

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1answer

I have a 2004 International 4300 dt466. there is no power to the a/c clutch, checked refrigerant charge ok, cked press. switches ok, tested compressor clutch ok, cked fuse ok, cked relay ok. any other...

Ac compressor clutch will not engage clutch is ok new switches and dryer and full charge 1.87 and no codes please help

May 17, 2011 • GMC G3500 Cars & Trucks

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1answer

On my 2007 Dodge 2500 diesal the AC clutch will not engage. I found the fuse box under the hood and there is only one 10 amp fuse that says hvac. so where is the clutch relay or fuse? Which big fuse...

there is no relay in that box that is called the tipm or totally integrated power module. that module is controlled by a computer and should be checked with a scanner to see if you have a code for the a/c. i m having the same problem i have been told it could be low freon but can not get the clutch to engage to check the high and low pressure. Also read where it may be the diode in the clutch on the ac compressor if you have a multimeter probe the compressor a good compressor will read somewhere between 3.5 and 4.0 anything else and clutch needs to be replaced. other possibilities may be the high or low pressure switch on the line. on myh 2006 2500 diesel it is located near the plug for the compressor on bottom side of motor. hope this helps.

Aug 22, 2010 • 2006 Dodge Ram 2500

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3answers

Ac clutch not engaging

you will have to see with test light if you have power going to the ac compressor you either have bad compressor or low pressure switch

Aug 18, 2009 • 1996 Dodge Neon

Question 2

Anonymous

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Your low on freon.

Anonymous Sep 05, 2010

If the system was full your static preasure should be close to your ambeint tem
JustRead Oct 06, 2010

Hey idiot he said he checked the "refrigerant" I know that's a big word compared to freon for your redneck culture...how about you give us a little insight instead of just trying to get thousands of posts. I have the same problem and my "refrigerant" is topped off. No leaks, used a sniffer. Swapped relays and fuses. Same problem. Thanks for your "word" of "wisdom" wilsodfarm. BTW "your" means possession as in "your car". Proper terminology would be "you're". As in a contraction for "you are". Wow how did you figure out how to use a computer.

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1998 GMC C3500. The AC compressor clutch won't engage. Checked the refrigerant pressure, 40psi @ 77˚. Checked the fuse in the box on the side of the dash as well as under the hood. Checked the AC Relay (switched it with the starter relay). No power to the electrical connection at the clutch.

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Ac clutch not engaging

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1994 chevy k1500 ac compressor not getting power when i turn ac on

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1998 GMC C3500. The AC compressor clutch won't engage. Checked the refrigerant pressure, 40psi @ 77˚. Checked the fuse in the box on the side of the dash as well as under the hood. Checked the AC Relay (switched it with the starter relay). No power to the electrical connection at the clutch.

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On my 2007 Dodge 2500 diesal the AC clutch will not engage. I found the fuse box under the hood and there is only one 10 amp fuse that says hvac. so where is the clutch relay or fuse? Which big fuse...

Ac clutch not engaging

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1994 chevy k1500 ac compressor not getting power when i turn ac on

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