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Search Auto Parts Search 2001 Silverado heater won't shut off Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum SamL New User Sep 13, 2006, 6:42 PM Post #1 of 4 (5455 views) 2001 Silverado heater won't shut off Sign In Hello, I have a 2001 Silverado and the other day the blower just came on all by itself. It was sorta creapy! The switch is in the off position and the blower is blowing high. I still have full control of the temperature, meaning I can run the AC or the heat . I just can't shut it off. The major issue is that it stays running even with the engine off. I had to pull the fuse under the hood to shut it off. Any suggestions? Thanks in advance! DanD Veteran / Moderator Sep 14, 2006, 3:50 AM Post #2 of 4 (5452 views) Re: 2001 Silverado heater won't shut off Sign In If it’s the 30 amp H/AC fuse that you’re having to remove from the under hood fuse panel, then the problem is likely the blower motor resistor/relay assembly. The first three speeds of the blower motor receive their power from a different source then high speed. This (lower speed) source voltage is feed through a combination of resistors to achieve the desired fan speed. When the switch is turned to the high speed setting a relay is energized opening the circuit for the first three speeds and at the same time closing the circuit for high speed; bypassing the resistors and applying full system voltage to the fan motor. This relay is probably stuck or the points in the relay are welded together. Yes I said points; you would think with all of today’s electronics they would find something better then a set of breaker points that have been around since they discovered electricity. LOL You’ll find this resistor/relay assembly bolted to the heater plenum close to the blower motor. Dan. Canadian "EH" (This post was edited by DanD on Sep 14, 2006, 4:25 AM) SamL New User Sep 14, 2006, 6:01 PM Post #3 of 4 (5445 views) Re: 2001 Silverado heater won't shut off Sign In Dan , Thanks for the great advice! Yes it is the stuck in high speed and I did have to pull the 30AMP fuse. I will look into the relay you mention as soon as I find the heater plenum and blower motor! Can you help a bit more? Under the dash - or under the hood????? Sam DanD Veteran / Moderator Sep 15, 2006, 1:26 AM Post #4 of 4 (5442 views) Re: 2001 Silverado heater won't shut off Sign In Under the dash; turn the fan on and follow your ears. The thing that’s making all the noise is likely the blower motor. You may need to remove a knee pad under the right side of the dash to actually see the motor. Once you find it you’ll also see a purple electrical wire plugged into the motor; follow it to a connector which should be within 1 foot or less of the motor; that should be the resistor/relay assembly. The resistor assembly is held to the plenum by two hex head screws 7mm or 9/32 in size. Dan Canadian "EH"   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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