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2000 Silverado 2500 6.0 AC Issues

insidethreat07

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insidethreat07 Enthusiast

insidethreat07

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Posted

As the title states I have a 2000 Silverado 2500 6.0 with some AC issues. Back in march I put a new compressor, orifice tube filter, and accumulator in. About a 3 weeks ago the air hasn't been as cold as before, it's been cool but not cold. The  AC compressor has been kicking off and on like clock work. I thought maybe the high pressure switch on the accumulator  was bad so I replaced it and same thing. So I bought the refrigerant in a can yesterday and hooked it up and the PSI on the guage read about 35 PSI. So I put it up to about 40 PSI and and instantly got colder. Now today after getting home from work the air is back to being just "cool", so I just hooked the guage back up and while the clutch is engaged I can watch the PSI needle steadily drop to about 25PSI, then the clutch disengages and then I can steadily watch the PSI climb to about 55-60PSI then the clutch engages again and the PSI drops again, and this pattern just continues. Also the compressor is engaging and disengaging even the the AC button in the truck if off and just the regular air is on.

 

Any tips on what to do next? No I haven't added any dye yet to see if it's leaking anywhere either. Trying to make that a last resort

Supreme Pizza Senior Enthusiast

Supreme Pizza

Posted
Posted

The pressure reading while the pump is on is the more important reading. 

 

The A/C pump may activate if your on certain vent settings, such as defrost - even if you have not selected A/C. 

 

Sounds like you have a leak if the pressure and performance is diminishing with time - Especially if adding more Freon makes it work better again. 

 

You might something like this: 

 

 

 

 

 

 

 

81xWJPEcHFL._SY879_.jpg

insidethreat07 Enthusiast

insidethreat07

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1 minute ago, starman8tdc said:

The pressure reading while the pump is on is the more important reading. 

 

The A/C pump may activate if your on certain vent settings, such as defrost - even if you have not selected A/C. 

 

Sounds like you have a leak if the pressure and performance is diminishing with time - Especially if adding more Freon makes it work better again. 

 

You might something like this: 

 

 

 

 

 

 

 

81xWJPEcHFL._SY879_.jpg

I bought the cold AC brand that also has the leak stopper in it as well.

4ba36271-fcfc-4d34-b03d-affe302ea99f_1.e

Supreme Pizza Senior Enthusiast

Supreme Pizza

Posted
Posted

That A/C pro stuff is pretty expensive. I usually get the generic 12 ounce cans for a dollar or two each and I buy about 50 at a time, just to stock up. 

 

Freon is Freon. Brand doesn't matter. 

 

As for the stop leak, I have had better results with a product that is specifically designed to "stop leaks", rather than products that just contains some stop leak additives. 

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