GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

MY CHECK ENG. LIGHT IS ON AN HEATER IS ON AN A/C COMES ON…

Customer Question
MY CHECK ENG. LIGHT IS...
MY CHECK ENG. LIGHT IS ON AN HEATER IS ON AN A/C COMES ON DISPLAY ANY IDEAS?
Submitted: 2 years ago.Category: GMC
Show More
Show Less
Ask Your Own GMC Question
Answered in 24 minutes by:
2/19/2016
GMC Mechanic: Lou P., ASE Certified Technician replied 2 years ago
Lou P.
Lou P., ASE Certified Technician
Category: GMC
Satisfied Customers: 6,238
Experience: I Have knowledge in almost all car lines and can help with general questions and more!!!!!
Verified

Hello, can you clarify the a/c issue?

Ask Your Own GMC Question
GMC Mechanic: Lou P., ASE Certified Technician replied 2 years ago

for the check engine light there could be hundreds of reasons the light will come on, the best thing you can do is run to a autozone or oreillys or advance auto parts and have them read the codes, they do it for free, then with the code i can tell you what is happening and give you the best advice.

Ask Your Own GMC Question
GMC Mechanic: Lou P., ASE Certified Technician replied 2 years ago

Are you still needing assistance ? If so I am always here to help. Lou

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 Lou P. Your Own Question
Lou P.
Lou P.
Lou P., ASE Certified Technician
Category: GMC
Satisfied Customers: 6,238
6,238 Satisfied Customers
Experience: I Have knowledge in almost all car lines and can help with general questions and more!!!!!

Lou P. 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 2013 GMC Sierra 2500 HD with auto climate controls.
Hi. I have a 2013 GMC Sierra 2500 HD with auto climate controls. In the last year or so, my outside temperature reading that appears in the main instrument cluster randomly begins to read below the ac… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2015 Gmc replaced compressor and expansion valve charged
2015 Gmc replaced compressor and expansion valve charged system gauges don't change and trucks not cooling. Ambient temp sensor showing -40. Will this cause the a/c not to work? I have taken the ambie… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,851 satisfied customers
2007 GMC Envoy SLT 4x4. The "graphic displays" on the radio,
2007 GMC Envoy SLT 4x4. The "graphic displays" on the radio, heater, odometer, all go off and them come on intermittently. Sometimes they will stay off for a long time then if you turn the car off and… read more
JFN1
JFN1
ASE Certified Technician
Vocational, Technical or Trade Scho
270 satisfied customers
I have a 1989 GMC 2500 pick-up (2 WD) My heater module quit
I have a 1989 GMC 2500 pick-up (2 WD) My heater module quit working. It is not the standard one listed in my GM shop manual. It looks just like the one shown for the 1991-1994 models. The fuse is fine… read more
Tool Hut
Tool Hut
Owner
519 satisfied customers
GMC Yukon SLT: I got a 2004 GMC Yukon xlt the dash displays
I got a 2004 GMC Yukon xlt the dash displays service ride control' how do I diagnose and repair it please advise thanks… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
Chev K 3500: I have a 1998 Chev 3500 pickup 6.5 turbo diesel
I have a 1998 Chev 3500 pickup 6.5 turbo diesel with approx. 250,000 kms. Engine will surge occasionally, stalls sometimes, always restarts, accelerator pedal is very touchy in that engine will surge … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
IM STILL HAVING TROUBLE WITH MY HEATER BLOWER. WHEN HEATER
IM STILL HAVING TROUBLE WITH MY HEATER BLOWER. WHEN HEATER BLOWER IS ON THE BLOWER DOES NOT BLOW AT A EVEN SPEED IT GOES UP AND DOWN. EARLIER IT WOULD NOT WORK SOMETIMES WHEN YOU START IT BUT YOU DRIV… read more
Dave Nova
Dave Nova
GMC Technician
Associate Degree
929 satisfied customers
GMC Yukon Denali: I frequently sit in traffic at idle for long
I frequently sit in traffic at idle for long periods (Saudi Arabia 125F). The AC is pretty weak and the engine tries to overheat so I have to use the throttle to get more air through the radiator. I a… read more
tripletauto
tripletauto
Shop Foreman
Associate Degree
140 satisfied customers
GMC Yukon 4x4: I have a 2000 GMC Yukon. I am having intermitent
I have a 2000 GMC Yukon. I am having intermitent Heat Issues. The Rear (Aux) Heat works fine but the Frount Heat Comes and Goes. I am getting good flow through the Heater Core so i dont think thats th… read more
tripletauto
tripletauto
Shop Foreman
Associate Degree
140 satisfied customers
GMC Suburban K1500 4x4: I just purchased a 1994 GMC suburban,
I just purchased a 1994 GMC suburban, I was told when I purchased it that the heat and ac did not work but the owner had the replacement part for it as he was told it was the control unit from the das… read more
Dave Nova
Dave Nova
GMC Technician
Associate Degree
929 satisfied customers
I have been having trouble with my A/C in a 2008 GMC Sierra
I have been having trouble with my A/C in a 2008 GMC Sierra 2500 crew cab diesel SLT. When I have used the AC during hotter weather, I have noticed on my dash mounted climate control display that the … read more
HondaPlatinum
HondaPlatinum
High School or GED
148 satisfied customers
GMC Sierra 1500: have a 2005 sierra with 138K miles. got
have a 2005 sierra with 138K miles. got a radiator flush and two days later, the A/C would only issue hot air. took to Champion and they said it was working fine, but now the A/C is blowing only a a f… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,796 satisfied customers
GMC Yukon 4x4: working on a 1997 GMC SUV 5.7L . Tha a/c blows
working on a 1997 GMC SUV 5.7L . Tha a/c blows cold just not very hard. It has all the speeds. You can hear the air coming out and change speeds. I know it is suppose to blow harder because i have the… read more
Hal
Hal
owner/service tech
Vocational, Technical or Trade Scho
848 satisfied customers
GMC K1500 4x4: I pulled the engine for a rebuild and is now
I pulled the engine for a rebuild and is now back in. A/C worked b4 the engine was pulled, does not work now. Also, A/C/heater control unit in dash does not move air flow from dash to face to floor. B… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
GMC sierra 2500 hd dmax: I found one of the 3 big (125 A) bad,
I found one of the 3 big (125 A) bad, replaced, and one in the other box (# XXXXX something-related to transnition), replaced. Truck runs OK engine and trans. but still has check eng. light ON. Drove … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,796 satisfied customers
GMC Sierra 1500 Classic SLE: my 2004 GMC sierra A/C, and heater
my 2004 GMC sierra A/C, and heater control on the passenger side does not work. when i turn on the heater it blows out cool air, and when i turn on the A/C it blows out the same temperature air as whe… read more
jonb9173
jonb9173
Diagnostic Technician
38 satisfied customers
I have 1994 gmc 1/2 ton 2whl. drive 5.7 eng. the heater was
I have 1994 gmc 1/2 ton 2whl. drive 5.7 eng. the heater was putting out hot air and while truck was idling started blowing cool air. I put a new radiator in and a new thermostat,but the heater hoses a… read more
Canadafix
Canadafix
Auto shop owner
Vocational, Technical or Trade Scho
869 satisfied customers
GMC 1500: 1994 GMC 5.7L Suburban. A & B terminals jumped flashes
1994 GMC 5.7L Suburban. A & B terminals jumped flashes "check engine light" code 12. All online references do not show a code 12 problem for my yr./mod.. did not pass CA smog check on last test at idl… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 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