CaLI87

I have a 08 silverado and when I push the button for the ac all it does it blinks a couple of times and the clutch won't even spin, it has freon what can be wrong

PathfinderJr

iTrader: (6)

Stupid question, but is your fan on? If I forget and have my fan on '0', ie off, and I press my a/c button, it'll blink and do nothing. The fan motor has to be running for the a/c to engage and turn on.

CaLI87

Stupid answer but thanks anyway..

terravast4

iTrader: (25)

didnt sound stupid to me......you asked.

CaLI87

Fan is on, has freon checked wires I have no clue why is not engaging

PathfinderJr

iTrader: (6)

I meant that my question to you was stupid, as in I figured it was trivial but sometimes the easiest things are overlooked.

CaLI87

Sorry about that man just a misunderstand anyway anybody else has ever experience this?

slpsilverado

iTrader: (1)

I do this kind of crap all the time. Like killing a fly with a shotgun, when all you need is a flyswatter.

04Silverado5.3

There is a bulletin for this.

#07-01-38-006: Information for Vehicles with HVAC Control Module A/C Indicator Blinking Due to Low Battery State of Charge - (Aug 20, 2007)


Subject: Information For Vehicles with HVAC Control Module A/C Indicator Blinking Due to Low Battery State of Charge


Models: 2007-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2007-2008 GMC Sierra, Yukon, Yukon XL

with Manual Temperature Control HVAC System (RPO CJ3)




--------------------------------------------------------------------------------

An Air Condition (A/C) button on the Heating, Ventilation and Air Conditioning (HVAC) control module may blink when the A/C system is activated. The blinking indicator will turn to a solid light after cycling the A/C button or ignition key.

This condition may be caused by a low battery state of charge on a PREVIOUS ignition key cycle. This condition may be due to situations were an unsold vehicle is parked for long periods of time as part of a dealership's unsold inventory. The A/C indicator begins to flash If the battery voltage falls below 9.5 volts. The low voltage condition may occur during an engine crank or if the vehicle is parked and a normal battery state of charge is not maintained.



Run the vehicle to charge the battery or connect a battery charger. (If the charging system is operating as designed , the battery surface charge should indicate 12+ volts.)
Do Not Replace the battery, HVAC control module or ECM.


If the A/C indicator continues to blink, use the Tech 2® to help determine the cause.
• Connect the Tech 2 and build the vehicle.

• Select Powertrain.

• Select Engine Control Module (ECM).

• Select Data Display.

• Select Cooling/HVAC data.

• Make sure that there has been an A/C request signal.

• History should indicate any causes.

If necessary, refer to SI for further information on HVAC system diagnostic procedures.

CaLI87

Thanks a lot man that solved my problem, low voltage was causing it. thanks