need help , blower relay

ierider · 03-30-2009, 10:59 AM

im having trouble finding relay for my blower , hvac , i have a 04 silverado 3/4 ton 4x4, none of the relays are marked hvac or blower , can any of u guys help

leolkfrm · 03-30-2009, 03:41 PM

is this why??

Subject: HVAC Blower Motor Runs After Vehicle is Turned Off
Model: 2002-2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer
2002-2004 GMC Envoy, Sierra, Yukon
with Manual Control HVAC

Condition

Some customers may comment that the HVAC blower motor continues to run after the vehicle has been turned off.

Description

The source of the customer complaint may be a stuck HVAC blower motor relay or linear power module (LPM).

Procedure

If the vehicle’s HVAC blower motor circuit uses a relay, the relay may stick in the "on" position. When the HVAC blower relay has been energized, the contacts may "micro-weld’ together. After this occurs, the HVAC blower motor motor may not respond to the HVAC control commands.
For vehicles that use a LPM, the root cause is an internal failure within LPM.

In the situation where either the relay or LPM may be the source of the complaint, the failed part must be replaced.

After component replacement, confirm that the customer’s concern has been corrected

leolkfrm · 03-30-2009, 03:54 PM

http://www.extendedgmwarranty.com/ow...-Silverado.pdf

here is the complete book, I think the electrical sec will help you

ierider · 03-30-2009, 04:41 PM

yeah thats what happened my blower wouldnt stop running and now it doesnt blow at all i have my owners manual but i cant find relay even in book not even sure what an LPM is

leolkfrm · 03-30-2009, 05:14 PM

i believe it is in the under hood box, engine side in the middle, should show on the back of the cover

ierider · 03-30-2009, 06:29 PM

i appreciate all the help but i cant find a relay that says blower or hvac just a.c. comp

leolkfrm · 03-30-2009, 08:07 PM

i can't cut and paste the diagram in the book! it showed 1 listed as blower in the middle of the end with the relays. did you look under the cover??

ierider · 03-30-2009, 08:51 PM

none of the relay's say blower or hvac would it possibly be incorporated in the resistor

gmctrucks · 03-31-2009, 01:13 AM

Good info Leo.

crabtruck · 03-31-2009, 04:32 AM

Drawing I have shows it in the "blower Motor Resistor Assm"
Some have the impression that the newer parts make the blower
spin a bit faster on all speeds. Just a note.

03-30-2009, 10:59 AM	#1
ierider Full Member Join Date: Jan 2008 Posts: 17	need help , blower relay im having trouble finding relay for my blower , hvac , i have a 04 silverado 3/4 ton 4x4, none of the relays are marked hvac or blower , can any of u guys help

03-30-2009, 03:41 PM	#2
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	is this why?? Subject: HVAC Blower Motor Runs After Vehicle is Turned Off Model: 2002-2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer 2002-2004 GMC Envoy, Sierra, Yukon with Manual Control HVAC Condition Some customers may comment that the HVAC blower motor continues to run after the vehicle has been turned off. Description The source of the customer complaint may be a stuck HVAC blower motor relay or linear power module (LPM). Procedure If the vehicle’s HVAC blower motor circuit uses a relay, the relay may stick in the "on" position. When the HVAC blower relay has been energized, the contacts may "micro-weld’ together. After this occurs, the HVAC blower motor motor may not respond to the HVAC control commands. For vehicles that use a LPM, the root cause is an internal failure within LPM. In the situation where either the relay or LPM may be the source of the complaint, the failed part must be replaced. After component replacement, confirm that the customer’s concern has been corrected __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

03-30-2009, 03:54 PM	#3
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	http://www.extendedgmwarranty.com/ow...-Silverado.pdf here is the complete book, I think the electrical sec will help you __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

03-30-2009, 05:14 PM	#5
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	i believe it is in the under hood box, engine side in the middle, should show on the back of the cover __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

03-30-2009, 08:07 PM	#7
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	i can't cut and paste the diagram in the book! it showed 1 listed as blower in the middle of the end with the relays. did you look under the cover?? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

03-30-2009, 04:41 PM	#4
ierider Full Member Join Date: Jan 2008 Posts: 17	yeah thats what happened my blower wouldnt stop running and now it doesnt blow at all i have my owners manual but i cant find relay even in book not even sure what an LPM is

03-30-2009, 06:29 PM	#6
ierider Full Member Join Date: Jan 2008 Posts: 17	i appreciate all the help but i cant find a relay that says blower or hvac just a.c. comp

03-30-2009, 08:51 PM	#8
ierider Full Member Join Date: Jan 2008 Posts: 17	none of the relay's say blower or hvac would it possibly be incorporated in the resistor

03-31-2009, 01:13 AM	#9
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,030	Good info Leo.

03-31-2009, 04:32 AM	#10
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,364	Drawing I have shows it in the "blower Motor Resistor Assm" Some have the impression that the newer parts make the blower spin a bit faster on all speeds. Just a note. Attached Thumbnails

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