Blower Motor Always ON!

76silverado · 12-08-2008, 06:01 PM

The blower motor on my 76 Silverado is always on, no matter what position the switch is on. I know the switch might be bad but what else would cause this? It really doesn't bother me now, but when I start driving the truck more often I'm sure it will.

merlin5577 · 12-08-2008, 06:17 PM

Quote:

Originally Posted by 76silverado

The blower motor on my 76 Silverado is always on, no matter what position the switch is on. I know the switch might be bad but what else would cause this? It really doesn't bother me now, but when I start driving the truck more often I'm sure it will.

The switch that controls the fan is a rheostat (variable resitor) the only reason it would stay on is a short to power. Either the rheostat (switch) itself is bad, or a power source (stray wire??) is bypassing the switch.

leolkfrm · 12-08-2008, 06:48 PM

if you are talking always on low speed that is normal for that era. some of them were a simple jumper wire on the switch between low and off, you can cut it and get normal action on the switch

76silverado · 12-08-2008, 07:07 PM

yeah always on low

gmctrucks · 12-09-2008, 12:18 AM

I agree with leo that's how they were made back then I heard it's like that to remove any exhaust gases that might be in the truck cab.

12-08-2008, 06:01 PM	#1
76silverado Senior Member Join Date: Oct 2008 Location: NW Arkansas Posts: 355	Blower Motor Always ON! The blower motor on my 76 Silverado is always on, no matter what position the switch is on. I know the switch might be bad but what else would cause this? It really doesn't bother me now, but when I start driving the truck more often I'm sure it will. __________________ http://s513.photobucket.com/albums/t...t=HPIM1105.jpg '76 Silverado10 Custom Deluxe, 350 4barrel, th350 auto FULL TIME FOUR WHEEL!

12-08-2008, 06:48 PM	#3
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	if you are talking always on low speed that is normal for that era. some of them were a simple jumper wire on the switch between low and off, you can cut it and get normal action on the switch __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

12-08-2008, 07:07 PM	#4
76silverado Senior Member Join Date: Oct 2008 Location: NW Arkansas Posts: 355	yeah always on low __________________ http://s513.photobucket.com/albums/t...t=HPIM1105.jpg '76 Silverado10 Custom Deluxe, 350 4barrel, th350 auto FULL TIME FOUR WHEEL!

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12-09-2008, 12:18 AM	#5
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,030	I agree with leo that's how they were made back then I heard it's like that to remove any exhaust gases that might be in the truck cab.