Heater Fan Problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71swb4x4 · 12-14-2003, 11:23 PM

Hey guys and gals
My heater fan hasn't worked right ever since I got my truck 2 yrs ago. Today I decided to see if I could tackle it. The blower would never turn on until I got the slider all the way to the right, and then it was really picky, you had to have the slider exactly in the right place.
Well, turns out I had a new switch for it in the glove box, nice surprise. I put the new switch in, now I have 3 speeds, and they all seem to work good, but they only turn on once I get the slider to the last third of its range.
This is my fourth 69 - 72, and I don't remember it being that way on my others. Is that the way it works? Or is there a way to adjust it so it works through the whole range?
I guess its not a huge problem, since it does work on all three speeds now, but if its an easy fix I would rather have it be proper.

Shawn

jhow66 · 12-14-2003, 11:44 PM

Check this switch--you did not say which lever but it must be the one that controls this switch as the others only control doors. Fan should work on all 3 speeds with all levers to far left. Adjust cable so it works this way.

jhow66 · 12-14-2003, 11:49 PM

Forgot to mention that I borrowed this picture from a post by rage'nrat638--hope he does not mind.

71swb4x4 · 12-14-2003, 11:52 PM

sorry - forgot to mention that I don't have A/C, so I am pretty sure I don't have that switch down there, it seems to be a problem between the slider lever that we slide back and forth, and the switch that is directly connected to that. No way to adjust it that I could find, but sometimes I can't find the obvioius.

chucks70 · 12-15-2003, 12:29 AM

The switch doesn't engage until you are 2/3 the way over. The first part is opening the air duct I believe. You can feel when you start into the switch positions.

71swb4x4 · 12-15-2003, 01:58 AM

Thanks, that answers that. I appreciate the help.

BLACK AND BLUE 67-72 · 12-15-2003, 03:52 AM

Check to make sure that the plastic bushing is on the switch also.

12-14-2003, 11:23 PM	#1
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Heater Fan Problems Hey guys and gals My heater fan hasn't worked right ever since I got my truck 2 yrs ago. Today I decided to see if I could tackle it. The blower would never turn on until I got the slider all the way to the right, and then it was really picky, you had to have the slider exactly in the right place. Well, turns out I had a new switch for it in the glove box, nice surprise. I put the new switch in, now I have 3 speeds, and they all seem to work good, but they only turn on once I get the slider to the last third of its range. This is my fourth 69 - 72, and I don't remember it being that way on my others. Is that the way it works? Or is there a way to adjust it so it works through the whole range? I guess its not a huge problem, since it does work on all three speeds now, but if its an easy fix I would rather have it be proper. Shawn __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

12-14-2003, 11:44 PM	#2
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	levers Check this switch--you did not say which lever but it must be the one that controls this switch as the others only control doors. Fan should work on all 3 speeds with all levers to far left. Adjust cable so it works this way. Attached Images __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

12-14-2003, 11:49 PM	#3
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Forgot to mention that I borrowed this picture from a post by rage'nrat638--hope he does not mind. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

12-14-2003, 11:52 PM	#4
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	sorry - forgot to mention that I don't have A/C, so I am pretty sure I don't have that switch down there, it seems to be a problem between the slider lever that we slide back and forth, and the switch that is directly connected to that. No way to adjust it that I could find, but sometimes I can't find the obvioius. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

12-15-2003, 12:29 AM	#5
chucks70 Registered User Join Date: Feb 2002 Location: Cadiz, OH Posts: 628	The switch doesn't engage until you are 2/3 the way over. The first part is opening the air duct I believe. You can feel when you start into the switch positions. __________________ 68 1 ton dually 292, 2001 Sebring, 2004 Trailblazer, 11 Camaro Convertible.

12-15-2003, 01:58 AM	#6
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Thanks, that answers that. I appreciate the help. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

12-15-2003, 03:52 AM	#7
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Check to make sure that the plastic bushing is on the switch also. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

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