Blower fan only works on high speed

Tiny
RODHEIDE
  • MEMBER
  • 2013 GMC SIERRA
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 95,000 MILES
Blower fan will only work on high speed. Also A/C won’t work. Thought it might be related to blower problem. When A/C is turned on green light flashes a couple of times and then goes out.
Do you
have the same problem?
Yes
No
Sunday, March 10th, 2019 AT 5:01 PM

11 Replies

Tiny
SCGRANTURISMO
  • EXPERT
Hello,

This could be a problem with your Blower Motor Control Module. I have included a link to a guide down below.

https://www.2carpros.com/articles/low-or-no-air-flow-from-vents

I have also included instructions for troubleshooting your specific vehicle in the diagrams down below. Please go through both of these and get back to us with what you find out.

Thanks,
Alex
2CarPros

Was this
answer
helpful?
Yes
No
Sunday, March 10th, 2019 AT 6:34 PM
Tiny
CARLLEBLANC
  • MEMBER
  • 2006 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
My 06 GMC trucks ac blower motor is acting funny. First the high speed stopping working, now the blower works every now and than like when it just won'ts to. I have been told that it could be the resistor. Could this be the problem and were and how can I check it out.
Carl
Was this
answer
helpful?
Yes
No
-1
Saturday, December 26th, 2020 AT 9:43 AM (Merged)
Tiny
HMAC300
  • EXPERT
You need to disconnect the wire going to the blower and put a test light there to see if it is getting power on each part of the switch. If it does then it' s the blower, if not then you need to check your switch to see if that is sending the power to the resistor. If it does then it's probably the resistor. It is a rectangular block that isn't easy to change, as it right by the blower motor.
Was this
answer
helpful?
Yes
No
Saturday, December 26th, 2020 AT 9:43 AM (Merged)
Tiny
ROBSHAW
  • MEMBER
  • 2004 GMC SIERRA
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 186,000 MILES
Fan control has stopped powering blower starting with speed 1& 2, after a year 3 stopped now4 has syopped I only have the highest setting, #5, that works. Switch problem or further
Was this
answer
helpful?
Yes
No
+1
Saturday, December 26th, 2020 AT 9:43 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
Sounds like it might be a blower motor resistor card the way the certain speeds stopped. Sometimes the connector to the resistors also melt to the resistors and need to be replaced as well. Unless you have a multi meter and want to do some testing with me I cant tell you for sure its the resistor. But my first thought would be a bad resistor.
Was this
answer
helpful?
Yes
No
+2
Saturday, December 26th, 2020 AT 9:43 AM (Merged)
Tiny
BOSSKOSIROG1
  • MEMBER
  • 2003 GMC SIERRA
  • 90,000 MILES
Do not have anything on 1 thru 4 fan speeds only on 5/high speed. How do I fix this
Was this
answer
helpful?
Yes
No
+5
Saturday, December 26th, 2020 AT 9:43 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Replace the blower motor resister
Was this
answer
helpful?
Yes
No
Saturday, December 26th, 2020 AT 9:43 AM (Merged)
Tiny
BOSSKOSIROG1
  • MEMBER
Where is the blower motor resister
Was this
answer
helpful?
Yes
No
+1
Saturday, December 26th, 2020 AT 9:43 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
It should be mounted on the HVAC box under the dash
Was this
answer
helpful?
Yes
No
Saturday, December 26th, 2020 AT 9:43 AM (Merged)
Tiny
BRUSHINVESTIGATIONS
  • MEMBER
  • 1996 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
New blower motor installed. The AC gets cold but when changing speeds from low med high, etc. The fan speed increases slightly. However on high itseems like it is not blowing very hard.
Was this
answer
helpful?
Yes
No
Saturday, December 26th, 2020 AT 9:43 AM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
If the blower motor is indeed working but you don't believe that it is pushing air out as much as it should for each speed it may be due a broken/loose vacuum hose. You will want to check behind the dash for a vacuum leak.
Was this
answer
helpful?
Yes
No
Saturday, December 26th, 2020 AT 9:43 AM (Merged)

Please login or register to post a reply.

Sponsored links