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Daniel Wilson
Daniel Wilson,
Category: Chevy
Satisfied Customers: 4378
Experience:  Owner at DJ Wilson
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Just bought a 2008 Suburban. Tried to turn on the air

Customer Question

Just bought a 2008 Suburban. Tried to turn on the air conditioning on a trip to Florida. Air conditioning light blinks 3 times and goes off. Air coming from the vents does not get cold. Is this something i can fix or is it electrical and needs to be serviced? I tried unhooking the battery cable and that didn't fix it. Also tried holding the a/c and recirculate buttons at the same time to re-calibrate and this did not work. ??? Thanks.
TC
Submitted: 8 months ago.
Category: Chevy
Expert:  Daniel Wilson replied 8 months ago.

Hi my name is***** will be glad to try to help. First lets try this procedure.

Here is how to do the recalibration.

  1. Turn OFF the ignition.
  2. Remove the battery positive voltage circuit fuse of the HVAC Control Module. This is done by removing the RADIO fuse.

    Important: The scan tool must be disconnected from the vehicle to properly perform the calibration procedure. If a scan tool is connected before this procedure is completed, then new calibration values will not be stored.

    Important: Failure to wait 60 seconds will not allow the HVAC control module sufficient time to clear the old calibration values.

  3. Wait 60 seconds.
  4. Install the fuse.
  5. Turn ON the ignition.
  6. Wait 60 seconds to finish the calibration.
Expert:  Daniel Wilson replied 8 months ago.

Let me know if this re-calibration procedure works and the fault does not return active.

Customer: replied 8 months ago.
Tried procedure and it did not work. The compressor is not turning on at all.
Expert:  Daniel Wilson replied 8 months ago.

It is possible you have a leaky system or other problems.

Customer: replied 8 months ago.
Expert:  Daniel Wilson replied 8 months ago.

Check the lines and fittings for signs of oily residue indicating a leak. if found the leak needs to be repaired and the system properly recharged.

Expert:  Daniel Wilson replied 8 months ago.

Hook a manifold AC gauge set onto the vehicle and see what you have in the system for pressures to check for low system charge.

Expert:  Daniel Wilson replied 8 months ago.

If the charge is ok then check all your fuses and the harness to the AC compressor and the pressure and temp switches for problems

Expert:  Daniel Wilson replied 8 months ago.

The A/C light is designed to flash and disallow A/C operation if any of the following conditions are present:

Ambient air temperature (AAT) is too cold (35 degrees or colder)
Vehicle system voltage is less than 9.5 volts
Refrigerant pressure is too low
Refrigerant pressure is too high
Engine coolant temperature (ECT) is too high
Engine is not in RUN
HVAC Control Head is in the OFF position

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