Automotive Air Conditioning Information Forum (Archives)

Provided by

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

GM High Pressure Switch

traderyoda on Sat July 03, 2010 5:14 PM User is offline

Year: 1999
Make: Chevy
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?


GM Tech on Sat July 03, 2010 8:04 PM User is offline

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......

traderyoda on Sat July 03, 2010 9:36 PM User is offline

Thanks GM Tech - mystery solved. Appreciate your help very much!!!

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.