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Originally Posted by matthewr
Help!!! I am running into a problem with my fan blower automatically coming on. When the 99 Suburban is sitting in my garage, the fan blower for the airconditioner comes on, along with the 4x4 lights on the buttons, also, the air starts blowing out the vents. Even if you turn the A/C to the off position, the blower will turn on; however, nothing will come out of the vents. This is not the fan in the front of the engine. This is the A/C blower. It has done this for almost 2 years. It just gets really annoying. Please also note that the engine is cold, warm, hot... It does it all the time. It will come on about every 15 minutes. Please let me know if you can help.
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I would start by looking at your blower relays. Is it the the front blower or the rear blower (near the rear doors)? If it is the rear blower there are 3 relays (not shown in the manual) located under the plastic shelf on the rear passenger side forward and above the blower motor. I had one in my '97 K1500 that would short sometimes when the vehicle was off and run the blower until it drained the battery.