Manufacturer communication — 2006 GMC YUKON DENALI XL

• 2015 and prior GM passenger cars and trucks.

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  2015 and Prior GM Passenger Cars and Trucks

• The A/C blows warm or A/C performance is poor.

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  Customer may comment that there A/C blows warm or they have poor A/C performance.

Steps to confirm (in the document’s order)

1. Record the A/C high and low pressures, the outside temperature, the humidity and the vent temperature.

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   • A/C High and Low pressures • Outside temperature • Humidity • Vent temperature

2. With an automatic HVAC system, read with the scan tool the inside temperature sensor, the outside temperature sensor, the duct temperature sensors and, if equipped, the evaporator temperature sensor.

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   If the unit is equipped with an Automatic HVAC system, go into the HVAC data with the scan tool and get the following readings: • Inside temperature sensor reading • Outside temperature sensor reading • Duct temperature sensor readings • Evaporator temperature sensor reading (if equipped)