Blower Motor Problem?

Tiny
MRODRI1951
  • MEMBER
  • 2005 GMC ENVOY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
My heater blower motor stopped working, I replaced the Climate Control Assy and the motor worked. I reinstalled all components and did something wrong because I lost all power and could not remove my key. I jumped my GMC removed my key and charged the battery. The next morning I started my GMC and the blower motor would not work. I pulled the blower motor and jumped it to my batter and it worked fine. I installed the blower motor and it will not operate via the control assy. I checked and double checked all blower motor/HVAC fuses and swapped the relay under the good with another function relay but still no blower motor operation. Suppestions please.
Wednesday, February 3rd, 2010 AT 5:19 PM

15 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Is this an automatic, or manual climate system? It makes a significant difference in the schematic, and components involved. Lets start by checking the motor this guide will help.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Here are the blower fan wiring diagrams so you can see how the system works. Check out the diagrams (Below). Please let us know what happens.
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Wednesday, February 3rd, 2010 AT 10:50 PM
Tiny
MRODRI1951
  • MEMBER
  • 2 POSTS
It's a manual system, meaning the driver selects temp with sliding dual temp controls.

Thank You
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Thursday, February 4th, 2010 AT 12:44 AM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
According to my schematic, check first the blower fuse 40amp in underhood fuse block. With a test light to ground, check for power at blower resistor terminals G, B in lo, A in med 1, D in med 2, C in med 3, and F in hi. Check for ground on pin E. If you could use this ground to ground your test light when checking the above, it will validate it. If you have power and ground (the resistor can be disconnected) on these, and no power or ground to your blower, than replace the resistor. The resistor is shown attached to the blower motor.
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+3
Thursday, February 4th, 2010 AT 8:48 AM
Tiny
FRANKIEBOY
  • MEMBER
  • 1 POST
  • 2005 GMC ENVOY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 1,112,550 MILES
I have a 2005 GMC Envoy which the main blower motor does not turn off even when the truck is off and key is out the ignition and stays on it's highest level. Would it be the relay and if so where is it located? Please help it's cold up here in the NorthEast country.
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Tuesday, July 28th, 2020 AT 2:07 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
I assume you have Auto Temp Control. That is usually caused by the blower speed control module which is located where the blower motor resister normally would be, next to the blower motor.
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Tuesday, July 28th, 2020 AT 2:07 PM (Merged)
Tiny
LBH
  • MEMBER
  • 1 POST
  • 2003 GMC ENVOY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
I have a 2003 GMC envoy with front and rear heat and ac. The front heater fan stop working. The rear system is still working fine. WHAT CAN I DO?
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Tuesday, July 28th, 2020 AT 2:07 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Does the fan work on any speed? Have you checked fuses?
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Tuesday, July 28th, 2020 AT 2:07 PM (Merged)
Tiny
EGUNS80
  • MEMBER
  • 85 POSTS
  • 2003 GMC ENVOY
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 147,000 MILES
My blower motor only works on 4 and 5. I have nothing on 1, 2 and 3, is it a blower motor or something else?
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Tuesday, July 28th, 2020 AT 2:07 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon,

The most common issue is the blower resistor. I will attach the procedure and the picture of the location.

Roy

Procedure

REMOVAL PROCEDURE
1. Remove the right closeout/insulator panel.

ImageOpen In New TabZoom/Print

2. Disconnect the blower motor resistor electrical connector (3).
3. Remove the blower motor resistor mounting screws (2).
4. Remove the blower motor resistor (1).
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Tuesday, July 28th, 2020 AT 2:07 PM (Merged)
Tiny
EGUNS80
  • MEMBER
  • 85 POSTS
Where is the panel located?
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Tuesday, July 28th, 2020 AT 2:08 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
On t b.C. E end cap of the dash and under CD where your knees are.
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Tuesday, July 28th, 2020 AT 2:08 PM (Merged)
Tiny
RODALLEN36
  • MEMBER
  • 1 POST
  • GMC ENVOY
I have a gmc envoy 2003 75,000 v6 Ihave checked the fuses and they are ok and I can hear something trigger when I raise the speed on the fan but nothing comes out then after about 30min I can feel heat but I sill can't hear the fan blowing.
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Tuesday, July 28th, 2020 AT 2:08 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
Check for 12v at the blower motor if thers juice change the motor with a new one. If nothing there check for cracked or cut wires also the relay.
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Tuesday, July 28th, 2020 AT 2:08 PM (Merged)
Tiny
IH619
  • MEMBER
  • 1 POST
  • 2002 GMC ENVOY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 80,000 MILES
The heater blower just stopped working. I was wondering if it could just be a fuse or has the motor just died? Seemed very abrupt it was working fine then I got in the car this morning and the blower would not come on. It also could be the switch What is the best way to troublr shoot this. I looked and can not fine the fuses.
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Tuesday, July 28th, 2020 AT 2:08 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Direct battery voltage to the blower motor and see what happens if it comes on could be the resistor/blower motor relay/control switch/fuse-
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+4
Tuesday, July 28th, 2020 AT 2:08 PM (Merged)

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