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HEATING PERFORMANCE DIAGNOSTIC Heating Performance Diagnostic 21 perform the repairs. 2. Compare the pressures and the instrument panel outlet air Are the readings within the specified Go to Step 22 Go to Air 22 Operate the system in order to verify the System OK Go to Symptoms Step Action Yes No DEFINITION: Heating system performance. 1 Were you sent here from Symptoms or Go to Step 2 Go to Too Cold 2 1. Start the engine. 2. Allow the engine to idle. Does the engine reach a normal operating Go to Step 3 Go to Step 9 3 1. Allow the engine to idle. 2. Select the FLOOR mode. 3. Select the minimum blower speed. 4. Select the warmest temperature setting. 5. Feel the temperature of the inlet and outlet heater hoses at the heater core. CAUTION: Refer to Moving Parts and Hot Surfaces
2007 Hummer H3 2007 HVAC Heating, Ventilation and Air Conditioning - H3
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