Question about 2004 Chevrolet Silverado 2500HD

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My 2002 silverado 2500HD with the 6.0L a/c compressor clutch will not kick in but has sufficient coolant,the low and high pressure switches a have good connection but the clutch has no positive current, the relay in the underhood fuse box is also working fine.Where is the current likely being lost?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2004 Chevy Silverado 2500HD 6.0L- loosing coolant

intake manifold boltsare loose goto alldata.diy.com to confirm soulution.

Posted on Jun 24, 2009

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SOURCE: a/c compressor clutch not engaging on 2000 chevy

jump high pressure switch,if it does not work charge your a/c system..

Posted on Jun 25, 2009

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SOURCE: 2001 chev tahoe has no power at a/c clutch checked

IF YOU HAVE 100 PSI ON LOW SIDE.YOU HAVE A EXCESSIVE AIR AND MOISTURE IN THE SYSTEM.YOU HAVE TO HAVE SYSTEM DISCHARGED AT AC SHOP OR DEALERSHIP.YOU HAVE TO REPLACE ACCUMULATOR OR RECEIVER DRIER.HAVE SYSTEM EVACUATE.THEN RECHARGED.SEE YOUR AC IS NOT TO COME ON LONG AS YOUR LOW SIDE TO HIGH.YOUR LOW PRESSURE SWITCH. IS NOT GOING TO CLOSE CIRCUIT TO TURN ON COMPRESSOR.UNTIL PRESSURE DROP AT A CERTAIN LOW PRESSURE.

Posted on Aug 25, 2009

Molson02536
  • 3854 Answers

SOURCE: 2001 silverado 2500hd a/c HEADACHE

There is a good chance that the electro magnetic compressor clutch is bad and will need to be replaced. The compressor is good, but the clutch system has a short in it at the compressor's clutch, which is causing your fuse to blow.
Test the connection at the clutch for a short if you have a multi meter. If it shows you have a short, then replace the electro magnetic clutch solenoid.
Thank you for using fixya and be safe.

Posted on Jul 17, 2010

XKarDoc
  • 453 Answers

SOURCE: Just replaced a/c compressor and

If you have the system down to 29" you shouldn't need the compressor running. You don't indicate if your trying to recharge with 12oz cans or with a 30# bottle. With the cans you should be able to turn them upside down and put the freon in as a liquid. It should just get sucked into the system. When no more will go in by that method there should be enough in the system to allow the compressor to engage when you turn it on. Then you can top the system off by adding the rest as a gas (can upright). I'm assuming you're connected to the low pressure port if you're using cans. We use a machine that pumps the freon into the system so the compressor doesn't get used in the process.

Posted on Apr 16, 2011

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If the compressor kick's in when you jumper the relay socket there is no problem with the electrical to the compressor an the compressor isn't locked up . You have a control side problem , the PCM - engine computer is suppose to energize the relay if no other problems are present . The proper way to check this would be to hook up a scan tool an check pressure input's to the PCM an is the PCM getting a request from the HVAC control panel to turn on the A/C compressor . AutoZone is wrong as usual , There can be codes without the check engine light being on . o'reilly's is wrong as well DTC P0530 (LU3, LR4, LM7, LQ4 and L18)
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Action Taken When the DTC Sets
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Diagnostic Aids
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• The A/C low side line pressure is under 138-172 kPa (20-25 psi).
• Throttle angle is at 100 percent.
• Engine speed is more than 5500 RPM.
• Engine coolant temperature (ECT) is more than 121°C (250°F).
• Ambient air temperature is less than 5°C (40°F).
• Engine is idling at a low unstable RPM
Compressor clutch engagement cannot be used to determine status of the low pressure switch. The low pressure switch is one of several inputs to the HVAC control module for A/C request authorization. A/C request is one of several inputs to the powertrain control module (PCM) that control A/C compressor clutch engagement.
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Do you have the proper diagnostic tools ? Factory scan tool , A/C gauges ? You best bet , take your vehicle to a qualified repair shop !!

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