Question about 2003 GMC Sierra 2500HD

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Air conditioning clutch will not engage. No

Air conditioning clutch will not engage. No voltage delivered to clutch. Checked all fuses and relays. What should I check next?

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  • shawn975 Jul 13, 2009

    Thx. Pressure is OK. Are the pressure switches open or closed when operating normally?




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Check if a/c has a full charge =if ok check pressure switches you might have a defective one.

Posted on Jul 12, 2009


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My 1999 Astro Van AC does not turn on. Good fuse,relay but gets no power to the switch into compressor.Can it be the heater/air condition control panel.

My first thought is, your low on refrigerant.
Checking fuses is good, also, use a test light and check voltage on fuse circuit. Some fuses are hot all the time. Some go hot with key on. I see three fuses involved and a/c enable relay.
Sometimes you can take electrical connector loose from compressor and use jumper wires from the battery for voltage and ground, just to see if compressor clutch will engage. The dark green wire is voltage, the black wire is ground.

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Air conditioning just stopped working checked fuse and relay do you have any idea what it may be thanks

What make model an year vehicle ? Well ,we can't say for sure would need to do some testing . You check fuse's ,ok that's easy , an you say you checked the relay .How did you do that ? There are videos on youtube on testing relay's an how to jump power right to the A/C compressor clutch coil .Do you know what a clutch coil is ? clutch not engaging 2005 Honda Odyssey Doesn't matter that this is a Honda ,all A/C systems work the same as far as clutch engagement . And there are a lot other videos as well .

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I have 2011 Nissan Sentra. Yesterday the a/c worked fine. Today it blows only hot air (compressor not engaging). I checked the freon, it's good. I'm lost.

If your fuses are all ok, there is a good chance the climate control unit has failed (the piece with all of the dials and buttons).

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My AC is not blowing cool air. Compressor clutch is not getting engaged. AC button is showing green light indicator though. I am suspecting clutch relay problem. where is air conditioning clutch relay in...

First of all check the freon pressure, if the pressure is low the compressor clutch will not turn on. The pressure should be between 30-40 PSI.

Aug 25, 2011 | 2004 Toyota Corolla

1 Answer

The AC clutch won't engage on my 2003 Hyundai Sonata SGX. It engages when i run a direct wire from the batter. I checked the voltage to the compressor through the wiring and it's about half a volt. ...

as with any electrical diagnosis you always want to check fuses and relays, but it sounds like 1 of 2 things......... you ethier really low on freon, causing it to cut off the clutch to save the compressor from damage due to lack of oil, (the lack of freon would indicate a leak in the system) Or your clutch switch is bad. resistance of .5 is normal, check the voltage from the harness, should be around 11.45 volts with engine running, if it s not then check your fuses, or relay also look for shorts in the harness along the path to the relay. if your checking the switch itself resistance should be around .5 like said earlier, but check a refrence manual to be absolute. but im sure its low freon or bad clutch switch.

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1 Answer

2000 chevy truck 5.3 liter. air conditioner works 10-15 min then stops. clutch and clutch pressure switch good, freon level good, batt and alternator good??

After the clutch disengages ( when it's not suppose to )check the voltage on the + output terminal on the clutch relay, (inside the fuse box under the hood) if you have voltage there, check the voltage at the clutch, if you have voltage there too, its the clutch. The clutch gets worn and will engage when cool,but fails after heat builds up. Check this by tapping the face of the clutch with the ac on, if it's simply a worn clutch it will likely engage for a while.

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1 Answer

Clutch won't engage on air conditioning compressor

The air gap may be too wide between the clutch disc and plate. It usually happens from wear. You can test this possibility by engaging the clutch electrically as you have done and then push on the disc slightly with the handle of a hammer or screwdriver. Be careful not to get your hand or fingers too close while the engine is running. Basically you are helping the magnetic field pull the disc in. I hope this helps.

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replace the black relay between the 2 blue relays in the fuse box. cost about 5 bucks.

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1 Answer

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looks like fuse # 8 "heater control relay- ac clutch relay-cooling fan" fuse runs the 12 volt side " black and yellow stripe wire " pcm or ecm runs the ground side "red -blue stripe wire"- what else do you need?

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