93-00 Full Size Utilities (GMT400 Old Style Only) AC Blows Warm and the High Side Pressure Is Too High - kw air condenser HVAC performance rear R134A temperature

The following diagnosis might be helpful if the vehicle exhibits the described symptoms in the PI.

Some OLD BODY (GMT400) style utilities with (C69) rear air conditioning may experience poor AC performance with the high side pressure reading too high.

If no resolution is found through normal diagnosis, check for a orfice tube located in the condenser outlet pipe. Vehicles with the RPO (C69) rear air conditioning should only be equipped with one orifice tube that is located in the "Y" pipe before the Evaporator Core. It is possible that a orifice tube has been installed at the condenser outlet pipe. Please be aware that replacement condensers come with a orifice tube already installed in the outlet pipe. This is due to the fact that this part number condenser is used on the light duty Utilities and Light Duty trucks. Thus, the orifice tube needs to be removed from the condenser on Utility Models that have rear AC only.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

(93-00 Chevrolet Suburban ) and (93-00 GMC Suburban ) and (00 Cadillac Escalade) and (95 - 00 Chevrolet Tahoe) and (95 - 00 GMC Yukon) and (99-00 GMC Yukon Denali)

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