Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Test Step 2 - A/C Cooldown Test
The following are prerequisites of the A/C Cooldown Test. Verify that the:
- Refrigerant system has an adequate charge. Check and repair as necessary before proceeding.
- Blower motor operates correctly in all speeds. Diagnose and repair all blower related faults before proceeding.
- Work area ambient temperature is above 16° C (60° F) before proceeding. Move the vehicle to a warmer work area if necessary.
- Evaporator temperature is above 13° C (55° F) before proceeding.
- A/C compressor is not running. If the compressor is running, turn the A/C off and allow the evaporator to warm up before proceeding.
Running the AC Cooldown test will cause the A/C status indicator to flash. One or more status messages will display on the scan tool after running the Cooldown Test. These messages will clear after paging back out of this test function. Therefore, it is important to note all messages before doing so.
- Start the engine.
- Turn the Blower control to the high speed position.
- With the scan tool in HVAC, select the A/C Cooldown test. Allow the test to run to completion.
Does the scan tool display a status message that indicates a fault has occurred?
Yes
- Perform the appropriate diagnostic procedure.
No
- Go to Test Step Test Step 3 - Mode Switch And Door Actuator Circuit Test .
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.