How JustAnswer Works:

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

Ask Dave Nova Your Own Question

Dave Nova
Dave Nova, GMC Technician
Category: GM
Satisfied Customers: 18829
Experience:  ASE Master Certification. GM World Class Certification
11042942
Type Your GM Question Here...
Dave Nova is online now
A new question is answered every 9 seconds

I have an 06 Impala, read out on dash says "engine hot a/c

Resolved Question:

I have an 06 Impala, read out on dash says "engine hot a/c off" the temp gauge drops to cold and rpms go up. The car is not hot, this will come on when I first start it, I don't beleive that it is the thermosat. Do you have any information on this issue?
Submitted: 1 year ago.
Category: GM
Expert:  Dave Nova replied 1 year ago.
Hello and thank you for trusting me with your question. My name is XXXXX XXXXX I will do my best to help you with your GMC problem.

First verify that the cooling sytstem is full and that the engine reaches normal operating temperature after warmed up. If cooling level is low, top off and repair any leaks found. The coolant crossover gaskets are prone to leaking on the 3.5 and 3.9 liter engine.

If the coolant level is okay but the engine does not reach normal operating temperature then the thermostat will need to be replaced.

If the coolant level is okay and the engine does reach normal operating temperature then the PCM (computer) should be updated. GM has released an updated calibration to deal with a false P0128 code. If this code is setting, you will have the symptoms you described.
Customer: replied 1 year ago.


The coolant levels are fine and there are no leaks. The check engine light has never come on. If a false code was happening would the check engine light come on? And, I ask the tech at the dealership about this and he had no idea what calibration i was talking about.

Expert:  Dave Nova replied 1 year ago.
Some codes do not turn on the check engine light on. Typically if the "engine hot/ a/c off " message is showing and the engine is not overheating then you will have a code P0128 code stored. This code will set if the engine does not reach normal temperature, meaning a bad thermostat or could be a computer calibration issue. I have included a copy of the GM technical bulletin below for you. You can reference this bulletin when talking to the dealership tech about the new calibration.



Bulletin No.: 08-06-04-026

Date: April 17, 2008

Subject:
Intermittent MIL/Check Engine Light On, DTC P0128 Set (Reprogram PCM)

Models:
2006 Chevrolet Impala, Monte Carlo

with 3.5L Engine (VINs K, N - RPOs LZE, LZ4)

Condition

Some customers may comment that the check engine light illuminates intermittently. Upon inspection, technicians may find DTC P0128 set.

Correction

Verify that the cooling system is filled to the proper level and using a Tech 2(R), verify that the thermostat is opening at the proper temperature. If everything is functioning properly, reprogram the PCM with a new service calibration using the TIS2WEB Service Programming System (SPS) application. As always, make sure your Tech 2(R) is updated with the latest software version.
Dave Nova, GMC Technician
Category: GM
Satisfied Customers: 18829
Experience: ASE Master Certification. GM World Class Certification
Dave Nova and 7 other GM Specialists are ready to help you

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:

 
 
 
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Gary

    GMC Technician

    Satisfied Customers:

    903
    15 years gm master tech/15 years ASE master tech
< Last | Next >
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    GMC Technician

    Satisfied Customers:

    903
    15 years gm master tech/15 years ASE master tech
  • http://ww2.justanswer.com/uploads/CA/caprio23/2011-12-13_155550_20111213105344.64x64.jpg Anthony's Avatar

    Anthony

    ASE Certified Technician

    Satisfied Customers:

    476
    ASE Master Automobile Technician with over 20 years exp.
  • http://ww2.justanswer.com/uploads/Rocket2005/2009-09-13_133703_jack.jpg car tech's Avatar

    car tech

    ASE Certified Technician

    Satisfied Customers:

    448
    25 year master tech and shop owner
  • http://ww2.justanswer.com/uploads/2P/2paulm/2012-4-4_183431_justabswer.64x64.jpg Paul M ASE Master's Avatar

    Paul M ASE Master

    ASE Master Tech

    Satisfied Customers:

    187
    ASE Master Tech 20+ Years
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)

    GMC Technician

    Satisfied Customers:

    89
    16 years of experience
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    GMC Technician

    Satisfied Customers:

    360
    ASE Master Technician advanced level specialist
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    GMC Technician

    Satisfied Customers:

    2262
    ASE Master Certification. GM World Class Certification