2004 Silverado 2500HD 6.6 Duramax. When engine idles the low pressure gains under 1500 rpm the low pressure goes back down. The A/C works fine unless at an idle the temperature slowly climbs as well does the low side prssure. Is the compressor going out or could there be another cause ? The low side is at 40, and gaining at an idle have seen it almost peg the canister gauge in the red ! Any Help please
Yes I did buy a can of AC Pro. I am in Alaska at present time I have gauges and a evacuator pump in WA state. I did not put any 134a into system for when I hooked the can up the gauge showed high yellow side. So I drove on later do not recall how long or how long I let the truck idle, when it has been close to 90 here when I hooked the can back up it was in the red. SO Early this morning it was only 70 ambient temp. The gauge showed 40. When I let it idle it kept climbing, When I went to 1500 rpm the gauge would drop back to 40. From every thing I have read or information I could find the compressor is going out. Yes it is not high dollar gauges but it is still a gauge. If it is climbing when at idle and drops back under higher rpm is this a bad sign of compressor failure? What else can I check ? every thing seems to work fine except at an idle after about 15 minutes it quits putting out cold air, eventually it quits working electric clutch is engaged just no cool air ??
Yes I did buy a can of AC Pro. I am in Alaska at present time I have gauges and a evacuator pump in WA state. I did not put any 134a into system for when I hooked the can up the gauge showed high yellow side. So I drove on later do not recall how long or how long I let the truck idle, when it has been close to 90 here when I hooked the can back up it was in the red. SO Early this morning it was only 70 ambient temp. The gauge showed 40. When I let it idle it kept climbing, When I went to 1500 rpm the gauge would drop back to 40. From every thing I have read or information I could find the compressor is going out. Yes it is not high dollar gauges but it is still a gauge. If it is climbing when at idle and drops back under higher rpm is this a bad sign of compressor failure? What else can I check ? every thing seems to work fine except at an idle after about 15 minutes it quits putting out cold air, eventually it quits working electric clutch is engaged just no cool air ??
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