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Step
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Action
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Yes
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No
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DEFINITION: Odor originating or noticed through the HVAC system.
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1
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Were you sent here from Symptoms or another diagnostic table?
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Go to
Step 2
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Go to
Symptoms - HVAC Systems - Automatic
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2
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1.
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Sit inside the vehicle.
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2.
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Close all of the doors and windows.
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4.
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Allow the engine idle at normal operating temperature.
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5.
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Select the maximum blower speed.
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6.
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Select the PANEL air outlet mode.
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7.
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Select the coldest temperature setting.
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8.
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Cycle through all of the blower speeds, modes and temperatures to define what type of odor is present.
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Does the odor have a musty smell?
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Go to
Step 3
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Go to
Step 8
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3
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Inspect the HVAC filter and the air inlet grille for debris. Refer to
Passenger Compartment Air Filter Replacement
.
Is debris present?
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Go to
Step 4
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Go to
Step 5
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4
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Remove any debris.
Is the action complete?
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Go to
Step 15
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-
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5
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Inspect for wet carpeting.
Is the carpet wet?
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Go to
Step 6
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Go to
Step 14
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6
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Inspect for the following conditions:
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•
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Water leaks around the windshield
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•
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Blockage of the HVAC module drain
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•
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Leaks around the door seals
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Is a leak present?
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Go to
Step 7
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Go to
Step 14
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7
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Repair the leak as necessary.
Is the repair complete?
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Go to
Step 15
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-
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8
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Does the odor have a coolant smell?
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Go to
Step 9
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Go to
Step 12
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9
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Inspect the cooling system for leaks. Refer to
Loss of Coolant
.
Is a leak present?
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Go to
Step 10
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Go to
Step 12
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10
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Inspect for coolant leaking inside the vehicle or for a film build-up on the windshield.
Is the condition present?
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Go to
Step 11
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Go to
Step 15
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11
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Replace the heater core. Refer to
Heater Core Replacement
.
Is the repair complete?
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Go to
Step 15
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-
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12
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Does the odor have an oily smell?
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Go to
Step 13
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Go to
Step 15
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13
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1.
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Inspect the engine compartment for any leaks. Refer to the following procedures:
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Is the repair complete?
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Go to
Step 15
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14
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A musty odor can be caused by mold or mildew build-up on the evaporator or the heater core or inside of the HVAC module. Refer to
Odor correction
.
Is the action complete?
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Go to
Step 15
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-
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15
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Operate the system in order to verify the repair.
Did you find and correct the condition?
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System OK
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Go to
Step 2
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