Question about 1996 Chevrolet Tahoe

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96 Tahoe no Cold Air

I have a 96 Chevy Tahoe that will not blow cold air. The compressor is cycling on and off and the pressure readings on the low-pressure side the compressor turns on when the pressure reaches 50 psi and off when the pressure reaches 15 psi this cycle time is less than 30 seconds. From what I can find on the Tahoe the pressure should be between 25 and 45. I have not added any Freon because of the high 50 pressure. Help Please

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  • Master
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Yes... you are most likely low on freon as the compressor will cut on low pressure before vacuum.Depending on ambient temps and head pressures your running ,you may see low side pressures at 50. Automotive refrigerant (134a) is not far from matching the degress to low pressure....for instance 50 lb low side pressure will give you approx 60 degrees cooling at the vent.Once cabin temperatures are met is when you can expect that suction pressure to lower and stabilize.You would be better off watching high and low pressures to get the full picture of whats going on here...good luck

Posted on Jul 22, 2009

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  • Chevrolet Master
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YOU NEED 28 PSI ON LOW SIDE AND ABOUT 190 ON HIGH SIDE.YOUR REFRIGERANT IS LOW THAT WHY COMPRESSOR CYCLING ON AND OFF.

Posted on Jul 22, 2009

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