Model: Silverado 1500 2WD NB
Engine Size: 4.3l V-6
Refrigerant Type: 134a
I have a question about the compressor mounted high pressure switch on my '99 Silverado's HT6 compressor. I decided to give the Sanden compressor a try. I pulled my old Delphi HT6 unit out and removed the high pressure switch. Since this job is costing plenty I decided why try to save $20 on the switch, so off I headed to my local auto parts shop and purchased a replacement. The old unit had a blue body, the new unit has a red body. I'd read someplace that the color of the body indicated the kick-out pressure of the switch. I held off buying it and headed to my Chevy dealer - they had exactly the same part (at twice the price). The replace AC Delco part number is 019197. I checked the GM parts fiche and it calls for part number 024976 to be replaced with 019197. I attached a pic showing the old and replacement side-by-side. Do I have the right part?
Red and blue body are the same-- they have the same spec-- off at 427 psi,, back on at 205-250 psi....Reds were used on earlier model HT-6s blues came later...
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
Thanks GM Tech - mystery solved. Appreciate your help very much!!!
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