GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

The blower will not run. I checked all related fuses and all…

Customer Question
The blower will not...

The blower will not run. I checked all related fuses and all are ok. When I turn the knob to high I hear and feel the relay enable. I did some reading and learned that the highest setting bypasses the resistor block. Do I have a bad resistor block or a bad motor?

Mechanic's Assistant: How many miles are on the car? Has the car been starting normally?

Yes. 180k.

Mechanic's Assistant: What is the model/year of your GMC?

2008 envoy

Mechanic's Assistant: Are you fixing your Envoy yourself? What have you tried so far?

Yes. I have ohmed out the selector switch yet. I took the cover off to get to the blower module. That is about as far as I got. Today.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I need to correct my typing. I have not ohmed out the resistor block.

Submitted: 11 months ago.Category: GMC
Show More
Show Less
Ask Your Own GMC Question
Answered in 1 minute by:
9/14/2017
GMC Mechanic: Amedee, GMC Technician replied 11 months ago
Amedee
Amedee, GMC Technician
Category: GMC
Satisfied Customers: 28,328
Experience: ASE Technician advanced level specialist
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

Ask Your Own GMC Question
GMC Mechanic: Amedee, GMC Technician replied 11 months ago

I am very sorry your having this issue with your vehicle.

I will try my best to answer all of your questions.

However, before we get started, please let me mention a few things.

1. If at any point you would like to speak on the phone, please feel free to request a phone call on your end and I can call you right away.

2. If you dont understand any technical terms or anything that I mention (component tests or theory or operation), please let me know and I will provide you with a more in debt explanation or answer.

3. Please understand that I am here to help.

Have you checked the wiring and signal to the blower motor?

What size engine do you have?

Ask Your Own GMC Question
Customer reply replied 11 months ago
Have I checked the wiring and signal to the blower?
Wiring is OK.
I have not checked the voltage to the blower motor itself yet.
What size engine do you have?
4.6L Its the one with the inline 6.I am pretty sure it is the resistor bank. The 4th speed on the blower switch setting went out a two years ago.
What voltages should I be reading for the various speed setting. I presume the highest setting would be 12VDC to the blower motor.
GMC Mechanic: Amedee, GMC Technician replied 11 months ago

Hello!

If the resistor went bad, the blower motor should still work on high speed.

Ask Your Own GMC Question
GMC Mechanic: Amedee, GMC Technician replied 11 months ago

YES, that is correct. On high speed, the blower motor should receive full battery voltage.

Ask Your Own GMC Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a gmc mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Amedee Your Own Question
Amedee
Amedee
Amedee, GMC Technician
Category: GMC
Satisfied Customers: 28,328
28,328 Satisfied Customers
Experience: ASE Technician advanced level specialist

Amedee is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,796 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,588 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

626 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

279 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

270 satisfied customers

GM Master Technician

George H.

George H.

ASE MasterTechnician

228 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

< Previous | Next >

Related GMC Questions
I have a 2006 Envoy and it had a bad blower motor resistor.
I have a 2006 Envoy and it had a bad blower motor resistor. I replaced the resistor and the AC worked great for about 3 days. After that the AC just stopped while I was driving. The AC still works, bu… read more
Tony McCarthy
Tony McCarthy
Owner Technician
151 satisfied customers
I have 2 problems on 03 GMC Envoy SLE, 140,000 miles, Heat,
I have 2 problems on 03 GMC Envoy SLE, 140,000 miles, Heat, manual controls First: when temp on cold, driver side vents blow hot while passenger side blows cold. Which actuator needs to be replaced? W… read more
supermechanic
supermechanic
Service consultant
Vocational, Technical or Trade Scho
10 satisfied customers
2008 sierra 1500 4x4 hvac blower motor comes on at highest
2008 sierra 1500 4x4 hvac blower motor comes on at highest setting but the four lower settingsare not working … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
2002 GMC Sierra pick up - ST COL was changed - now won't
2002 GMC Sierra pick up - ST COL was changed - now won't start. Original Passlock sensor is gone. Attempting to re-learn a generic value and bypass the system, after three tries still truck will not s… read more
Kavey
Kavey
86 satisfied customers
No power to blower resistor w/ automatic temp. controls on
No power to blower resistor w/ automatic temp. controls on 2004 gmc envoy slt. Fuses (blower, hvac, hvac 1, hvac b) all check out. What else should I look at? Thanks!… read more
roy
roy
Associate Degree
3 satisfied customers
GMC Sierra: 03 Sierra blower motor not working .all fuses check
03 Sierra blower motor not working .all fuses check out good no power at resistor. Is there a relay somewhere and does that sound like the problem. The control panel seems to be working.I bought a rel… read more
George H.
George H.
ASE MasterTechnician
Associate Degree
228 satisfied customers
GMC Envoy SLT: I have a 2004 GMC Envoy with electronic controlled
I have a 2004 GMC Envoy with electronic controlled heating and a/c system and has rear air. The rear blower motor will come on sometimes when it wants or unless direct ground is applied to the black w… read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
Blower motor not working on high speed. For my 1998 GMC Savana
Blower motor not working on high speed. For my 1998 GMC Savana 1500 conversion van, the blower motor has stopped working on the highest speed. All other three speeds work. The last time this happened … read more
George H.
George H.
ASE MasterTechnician
Associate Degree
228 satisfied customers
GMC: heater blower stop working. check blower. working. changed
heater blower stop working. check blower. working. changed resistor and harness. still not working. checking for a grounding problem but don't know location of grounding block for heater. 2004 gmc can… read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
GMC Envoy XL: I have a 2004 GMC envoy XL. The front AC will
I have a 2004 GMC envoy XL. The front AC will not blow anything when turned on full blast. The rear AC only blows for about 30 seconds and then cuts off on all settings. Any ideas all… Where to start… read more
Dave Nova
Dave Nova
GMC Technician
Associate Degree
929 satisfied customers
GMC Sierra 2500 HD SLE: 2004 GMC HD 6.6 the blower in the
2004 GMC HD 6.6 the blower in the cabin only runs on #3 or above. I havecan hear a clicking sound but it stops after the left temp is incresed. now all heat is not working, AC works?… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,796 satisfied customers
GMC C2500: I have 1985 GMC C25/C2500. The heater blower fan
I have 1985 GMC C25/C2500. The heater blower fan recently stopped working. None of the fan speeds work. What could be the problem?… read more
George H.
George H.
ASE MasterTechnician
Associate Degree
228 satisfied customers
GMC Envoy: I have a 2007 Envoy and the inside blower only works
I have a 2007 Envoy and the inside blower only works on #5 speed. checked all of the related fuses and relays. What is the cause?… read more
Amedee
Amedee
GMC Technician
Vocational, Technical or Trade Scho
28,328 satisfied customers
GMC Savana 1500: Blower on 1998 GMC Savana van isnt working.
Blower on 1998 GMC Savana van isn't working. This morning, the blower would work on all speeds except high. I disconnected the plug at the resistor to test a couple of wires, and after doing so the lo… read more
Dave Nova
Dave Nova
GMC Technician
Associate Degree
929 satisfied customers
GMC Sierra 1500: I have an issue with my electric fan in my
I have an issue with my electric fan in my 2005 GMC Sierra. A couple of weeks ago I noticed that it would run on high for no reason, even shortly after starting it. Now what ever was causing the issue… read more
supermechanic
supermechanic
Service consultant
Vocational, Technical or Trade Scho
10 satisfied customers
GMC Envoy XL SLT: I have a 2005 GMC Envoy that the Blower Motor
I have a 2005 GMC Envoy that the Blower Motor went bad. I have replaced the Blower Motor and have been trying to replace the resistor. i have purchased a new Wire harness as i have been told by a loca… read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
GM Canyon: I have a 2004 GMC Canyon, the blower for the heater
I have a 2004 GMC Canyon, the blower for the heater only works on high, does not work on any of the lower settings.… read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
where is the fan switch resistor located? I have no fan speeds,
where is the fan switch resistor located? I have no fan speeds, no heat, defrost, etc. need to diagnose before it gets too cold.… read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x