1996 - 2002 GM OBS Truck R134a AC High Pressure Ball Valve Service Port Leak Repair (Chevy & GMC)

In this video we will go over the replacement of a leaking AC high side service port valve, as well as a leaking low side Schrader port valve repair and test, in old body style (OBS) GM trucks. The low side valves can be replaced without evacuating the R134a refrigerant charge. But the high side replacement, being of a ball valve design, requires a complete R134a refrigerant recovery prior to performing the repair. After the repair several vacuum pump operations will be required to check for other leaks, as well as to validate that the replacement parts are not defective and then ultimately to pull a deep one hour vacuum to prepare the system for R134a refrigerant recharging. The vehicle illustrated is a GMT400 era OBS truck, a 1999 Chevrolet Suburban. But the approach, parts, and technique are applicable to all GM OBS trucks in the years specified in the title. For model year 2000 it will be limited to C/K 2500 and 3500 carry over models, Cadillac Escalade, and Chevrolet Tahoe Limited/Z71. The 3500HD for models years 2001 and 2002 would also be applicable for this repair video as they are also GMT400s.

The eBay and Amazon search links below are paid links, for which I may be compensated and earn a commission, if you choose to buy the parts and tools shown in this video thru them:

ACDelco 15-5438 high side port valve: https://ebay.us/3NACEk and https://amzn.to/2Nd6yxt

ACDelco 15-1119 low side port valve: https://ebay.us/6M3fxG and https://amzn.to/35Vnijm

If you are looking for a Schrader valve removal tool: https://ebay.us/kVAnRF and https://amzn.to/39UbsXS

If either of the valve caps are missing: https://ebay.us/qmCKmP and (high side cap only): https://amzn.to/3n1Ysph

Finally, the Mastercool 98234 high side valve removal socket: https://ebay.us/OkGlRC and https://amzn.to/3905C84

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1996 1997 1998 1999 2000 2001 2002

Chapters
0:00 - Problem overview
2:50 - Replacement part numbers
3:52 - R134a refrigerant recovery
4:52 - Low side Schrader valve core replacement
7:51 - High side service port assembly replacement
10:23 - Vacuum leak tests & final tips

Corrections:
6:53 - Later GM service instructions call for 18 inch pounds of torque for this service valve.
9:49 - Later GM service instructions call for 22 inch pounds of torque for this service valve.

#drshock #chevytrucks #carac #autoac #obstruck

Disclaimer: DrShock, the alias for the human content creator for this YouTube channel, is not responsible for any damages, injuries, losses, or liabilities associated with any repairs, upgrades, or maintenance performed on yours, or any other, vehicle whatsoever. No warranty, express or implied, is made as to the accuracy or completeness of any information provided within this channel. Viewing and using the “as-is" information of this channel is totally at your own risk. Always wear personal protection equipment and follow appropriate vehicle manufacturer service manual guidelines with original manufacturer parts only when performing any repairs, upgrades, or maintenance upon any vehicle.