Functional Check - HVAC System - Manual

Functional Check (Part 1 Of 3):

Functional Check (Part 2 Of 3):

Functional Check (Part 3 Of 3):

Functional Check

This operational test sequence aids in determining whether the following Systems are working properly:
^ Air conditioning (A/C)
^ Air conditioning (A/C) electrical
^ Vacuum
^ Refrigeration
1. Ensure that the temperature of the air is at least 16°C (60°F). The A/C system can not be properly tested unless it is at least this warm.
2. Start the engine.
3. Allow the engine to idle the engine for 20 minutes or until the cooling system thermostat is open.
4. Perform the Functional Check.
5. Compare the vehicle response to the normal system response.
6. If the vehicle does not respond correctly to any of the steps, use one of the following procedures in order to begin the appropriate diagnosis:
^ Insufficient heating
Refer to Heating insufficient Heating Insufficient
^ Insufficient cooling
Refer to Cooling Insufficient A/C Inoperative Cooling Insufficient - A/C Inoperative
^ Improper air delivery
Refer to Air Delivery Improper Symptom Related Diagnostic Procedures
^ Blower motor inoperative. Refer to Blower Motor Inoperative at Any Speed Blower Motor Inoperative - At Any Speed