Blower motor ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

krue · 12-08-2003, 07:09 PM

I am trying to trouble shoot my blower motor.
What should the switch positions be from top to bottom?
Mine only works in the position one up from the bottom.
I can hear the relay click.
What can it be? The resistor in the box is nice a shiny.

krue · 12-08-2003, 07:10 PM

PS mine is an AC truck so I have a high speed fan.

*67Fleetsidedream* · 12-08-2003, 07:32 PM

from top to bottom should be
off
low speed
high speed
The very bottom position has never worked on mine,
One of your resistor coils up inside the air duct might be bad causing you to have low speed only. There are 2 coils in the duct one for high speed and one for low speed.

**Classic Heartbeat** · 12-08-2003, 07:50 PM

I just repaired a truck with simeler problems.
From the top - Off/Low/Medium/High. The problem that I had was the fan relay. I could here it click, but it wouldn't go into high. I could get low and medium though. I replaced the relay and the problem was solved. WES www.ClassicHeartbeat.com

krue · 12-08-2003, 08:26 PM

I found my problem, the low was working but I couldn't hear it, finally looked at it. The high only works with ignition "ON" not in "ACC". So now I need a lever and some hoses and I can defrost my windows.

Hutch · 12-08-2003, 09:28 PM

krue
Check the high-speed fan relay ground wire very closely.
It is behind the glove box between the heater a/c box and the cowl.
It has a ground wire with a short black wire that connects to the firewall via a mounting stud for the heater box.
Mine was broke due to there was not much length on it and it had broken.
The symptoms were:
POS 1 Low speed = very low you have to listen very close
POS 2 Medium= seems normal
POS 3 High= very slow but turning

There is also another ground in the engine compartment that also works along with this one and it is right off of the fan.
The ground wires for the high-speed relay are trying to ground through the attachment bolts of the heater shroud, which is non-metallic.

12-08-2003, 07:09 PM	#1
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Blower motor ? I am trying to trouble shoot my blower motor. What should the switch positions be from top to bottom? Mine only works in the position one up from the bottom. I can hear the relay click. What can it be? The resistor in the box is nice a shiny. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

12-08-2003, 07:10 PM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	PS mine is an AC truck so I have a high speed fan. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

12-08-2003, 07:50 PM	#4
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	I just repaired a truck with simeler problems. From the top - Off/Low/Medium/High. The problem that I had was the fan relay. I could here it click, but it wouldn't go into high. I could get low and medium though. I replaced the relay and the problem was solved. WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

12-08-2003, 08:26 PM	#5
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	I found my problem, the low was working but I couldn't hear it, finally looked at it. The high only works with ignition "ON" not in "ACC". So now I need a lever and some hoses and I can defrost my windows. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

12-08-2003, 09:28 PM	#6
Hutch Registered User Join Date: Oct 2001 Location: Grapevine, Tx. Posts: 2,142	krue Check the high-speed fan relay ground wire very closely. It is behind the glove box between the heater a/c box and the cowl. It has a ground wire with a short black wire that connects to the firewall via a mounting stud for the heater box. Mine was broke due to there was not much length on it and it had broken. The symptoms were: POS 1 Low speed = very low you have to listen very close POS 2 Medium= seems normal POS 3 High= very slow but turning There is also another ground in the engine compartment that also works along with this one and it is right off of the fan. The ground wires for the high-speed relay are trying to ground through the attachment bolts of the heater shroud, which is non-metallic. __________________ John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS

12-08-2003, 07:32 PM	#3
67Fleetsidedream Wiseass secured himself a BAN Join Date: Nov 2000 Location: MOON!!! Posts: 2,282	from top to bottom should be off low speed high speed The very bottom position has never worked on mine, One of your resistor coils up inside the air duct might be bad causing you to have low speed only. There are 2 coils in the duct one for high speed and one for low speed.



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