Defrosting Insufficient

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
DEFINITION: Time required to defrost the windshield is longer than normal.
1	Were you sent here from Symptoms or another diagnostic table?	Go to Step 2	Go to Symptoms - HVAC Systems - Automatic
2	Start the engine. Select the DEFROST mode. Select the maximum blower speed. Does sufficient air flow from the defroster outlets?	Go to Step 3	Go to Step 6
3	Select the minimum blower speed. Select the maximum temperature setting. WARNING: Refer to Moving Parts and Hot Surfaces Warning . Feel the temperature of the inlet and outlet hoses at the heater core. Does the inlet hose feel warmer than the outlet hose?	Go to Step 7	Go to Step 4
4	Perform the A/C system performance test. Refer to Air Conditioning (A/C) System Performance Test (R-134a) Air Conditioning (A/C) System Performance Test (R-1234yf) . Is the A/C system operating within the specifications?	Go to Step 5	Go to Step 8
5	Inspect for correct operation of the air inlet door. Is the air inlet door operating correctly?	Go to Step 10	Go to Step 9
6	Repair the air delivery concern. Refer to Diagnostic Starting Point - Vehicle . Is the repair complete?	Go to Step 10	-
7	Repair the heating concern. Refer to Heating Performance Diagnostic . Is the repair complete?	Go to Step 10	-
8	Repair the A/C performance concern. Refer to Air Conditioning (A/C) System Performance Test (R-134a) Air Conditioning (A/C) System Performance Test (R-1234yf) . Is the repair complete?	Go to Step 10	-
9	Repair the air inlet door concern. Refer to Air Inlet Housing Replacement . Is the repair complete?	Go to Step 10	-
10	Operate the system in order to verify the repair. Did you find and correct the problem?	System OK	Go to Step 2