Chevrolet Silverado 1500 / 2500 / 3500:

2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

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# 1  7/13/2014 12:23 AM

oe812
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Registered: 7/13/2014
Posts: 6

2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

I have read several posts about a/c issues on a Chevy Silverado here but none related to what I am experiencing. I have the factory amount of refrigerant in my a/c. It cools fine at idle. The issue is when I accelerate to about 2000 rpm's the compressor cuts out. I only have a low pressure gauge and at idle with ambient temp at 90 degrees the low side pressure is 45. When I throttle the engine the pressure drops to 20 to 25 psi and the compressor cuts off.  Where do I need to start with troubleshooting?

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# 2  7/13/2014 1:42 PM

TechHelp2
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Registered: 11/24/2009
Posts: 1299

Re: 2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

The key to this problem is that when you raise the rpm and the pressure drops to about 20 to 25 is and indication you may still have to add some refrigerant to the system. 

The low pressure cut out switch is designed to cut the compressor clutch off at about 30 psi so the evaporator won't freeze up. So when you raise the rpm the pressure goes below the pressure threshold and cuts out the compressor clutch.

Add another can of R134a to your system slowly until the pressure remains above 30 psi.

We may still don't know the high side pressure so we may not be done yet. Lets just see how adding more R134a to the system fixes the problem.

Remember don't just add the full can you don't want to overcharge the system. Add it slowly at the higher RPM until the low side pressure stays at or around 30 psi.

Keep us informed on your progress.


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# 3  7/18/2014 3:22 PM

oe812
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Registered: 7/13/2014
Posts: 6

Re: 2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

Thank you for the information. I will either get a set of manifold gauges and read the pressures or take it to my independent mechanic and start from there.

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# 4  7/20/2014 6:13 PM

oe812
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Registered: 7/13/2014
Posts: 6

Re: 2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

I found a leak at high side Schrader valve. I bought a replacement valve but how do I remove the valve assembly without destroying the aluminum high side line?

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# 5  7/20/2014 8:08 PM

TechHelp2
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Registered: 11/24/2009
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Re: 2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

The Schrader valve can be removed by a core remover similar to a tire core remover.

You need to discharge the system then replace the valve.

If you want to invest in a tool to do the job without discharging the system then you can get a tool like the one I listed here. http://www.amazon.com/gp/product/B002G1…mistebl-20

This tool can help you change the valve without recharging the system.


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# 6  7/20/2014 9:17 PM

oe812
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Registered: 7/13/2014
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Re: 2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

I replaced the valve and now pulling a vacuum on the system

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# 7  7/20/2014 9:53 PM

oe812
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Registered: 7/13/2014
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Re: 2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

Added the pag oil and R134. I hope this works

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# 8  7/20/2014 10:38 PM

TechHelp2
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Registered: 11/24/2009
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Re: 2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

Keep me up to date.


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# 9  7/20/2014 10:58 PM

oe812
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Registered: 7/13/2014
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Re: 2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

TechHelp2 wrote:

Remember don't just add the full can you don't want to overcharge the system. Add it slowly at the higher RPM until the low side pressure stays at or around 30 psi.

Keep us informed on your progress.

TechHelp2, It seems to be operating like it should. I added enough R134 while revving engine at higher rpm's like you suggested. Ambient temp was around 75 and low side pressure is 35. Thanks for your info about revving engine. I used to do that with R12 systems but didn't realize R134 needs same attention.

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# 10  7/21/2014 1:49 PM

TechHelp2
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Registered: 11/24/2009
Posts: 1299

Re: 2001 Silverado 5.3L A/C Compressor Cuts Off After Accelerating

Glad to help. We are here anytime you need us.


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