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Noise Diagnosis - HVAC Module

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
Step Action Yes No
DEFINITION: Noise originating from the HVAC module.
1 Were you sent here from Symptoms or another diagnostic table? Go to Step 2  Go to Symptoms - HVAC Systems - Manual
2
  1. Start the engine.
  2. Cycle through all of the following:
    • Blower motor speeds
    • HVAC modes
    • Temperature control settings
  3. Determine the location of noise:
    • Recirculation door
    • Temperature door
    • Mode valve
Is noise evident when selecting recirculation?		 Go to Step 6  Go to Step 3 
3 Is noise evident when selecting temperature? Go to Step 6  Go to Step 4 
4 Is noise evident when selecting mode ? Go to Step 5  Go to Step 2 
5
  1. Remove the HVAC module. Refer to Air Conditioning (A/C) Evaporator and Blower Module Assembly Replacement .
  2. Inspect the mode valve for dust, dirt or debris.
Is dust, dirt or debris present?		 Go to Step 11  Go to Step 12 
6 Remove the HVAC module. Refer to Air Conditioning (A/C) Evaporator and Blower Module Assembly Replacement .
Is action complete?		 Go to Step 7  -
7
  1. Inspect the air flow door for proper operation.
  2. Inspect the ducts for obstructions or foreign materials.
Were any of these conditions found?		 Go to Step 10  Go to Step 8 
8 Inspect air flow door for warping or cracking.
Is air flow door in normal condition?		 Go to Step 13  Go to Step 9 
9 Replace air flow door.
Is repair complete?		 Go to Step 13  -
10 Remove any obstructions or foreign material found.
Is action complete?		 Go to Step 13  -
11 Vacuum and remove dust, dirt and debris.
Is action complete?		 Go to Step 14  -
12 Replace the upper evaporator case. Refer to Air Conditioning Evaporator Core Replacement .
Is action complete?		 Go to Step 14  -
13 Install the HVAC Module. Refer to Air Conditioning (A/C) Evaporator and Blower Module Assembly Replacement .
Is action complete?		 Go to Step 14  -
14 Operate the system to verify the repair.
Did you find and correct the condition?		 System OK Go to Step 2 
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