Diagnostic Starting Point - Heating, Ventilation and Air Conditioning

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The Heating, Ventilation and Air Conditioning (HVAC) system is divided into two separate sections. The first, Heating, Ventilation and Air Conditioning, has all procedures that pertain to a HVAC component or function that is not specifically associated with the manual control system. The second, HVAC Systems - Manual, has all procedures specific to the manual control system.

Begin the system diagnosis with the SYMPTOMS - HVAC SYSTEMS - MANUAL .

Review the Description and Operation information to help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation. The HVAC Description and Operation information is divided into:

The Air Delivery Description and Operation contains the following topics:

HVAC Control Components
Air Speed
Auxiliary Air Speed
Air Distribution
Auxiliary Air Delivery
Recirculation Operation

The Air temperature Description and Operation contains the following topics:

HVAC Control Components
Heating and A/C Operation
Auxiliary Heating
Engine Coolant
A/C Cycle