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 RussMasterTech Your Own Question

RussMasterTech
RussMasterTech, ASE Certified Technician
Category: Chevy
Satisfied Customers: 791
Experience:  19 years of GM Dealership experience. ASE Master with L1 and GM Master Certified in Electrical
Type Your Chevy Question Here...
RussMasterTech is online now
A new question is answered every 9 seconds

2002 chevy impala, heat temperature sensor

Customer Question

If this is a common problem with this car, why isn''t GM doing anything? I have had this car repaired on a monthly basis since I bought it. Intake Manifold, Windshield Wipers, Radiator Flush (just last week), Water Pump (just last week) and now the heat temperature control wire is faulty and I need to take it to either the dealer or a "specialist" to have them diagnosis it for $100, then tell me how much it will be to fix it. The temperature guage keeps going over the middle mark, sometimes to the red zone, and the car is heating up. Any advice?
Submitted: 6 years ago via CarComplaints.com.
Category: Chevy
Expert:  RussMasterTech replied 6 years ago.

Hello sissypot,

I'm not sure the sensor or the wiring are bad if the engine is running hot. All of the work that you've had done have all been seperate issues, but they may have aggravated an underlying issue of a failing head gasket. If the temp is going high like that since the water pump and the flush were performed, there is a good chance the tech that replaced the pump and did the flush did not bleed the air out of the system correctly. There is a specific fill procedure for this engine, and if it is not followed, overheating and engine damage can result.

With the engine off, and the radiator cap off, open the bleeder screws, one at the bypass pipe above the water pump and one at the upper hose outlet on the driver's side front corner of the engine where the upper hose connects. Fill the cooling system with a 50/50 mix of Dexcool and water until just coolant and water come out of the bleeders, NO AIR. Close the bleeders and top off the coolant.

If you got alot of air, or if it continues to overheat, you may have a head gasket failing that is allowing combustion gasses into the coolant which prevents proper coolant flow.

If you take it to a shop, have them perform a combustion gas analysis on the cooling system. This will be a clear chambered tool with a squeeze ball on one end. The tech will fill the cylinder partially with a blue "Test fluid" that will turn yellow if there is combustion gas present in the coolant. This will verify my suspicions.

Depending on how long you drove the car with low coolant prior to any of the previous repairs may have started this chain reaction, but I don't want to speculate. I just want you to understand what could be going on.

If you have additional questions related to this concern, or other information you wish to share with me to help me understand what's going on, please feel free to reply before clicking the "Accept" button.

If this is the information you were looking for, please make sure to click the "Accept" button so I may receive the credit for helping you today. Positive feedback is always appreciated.

Thanks for using Just Answer.

Russ

RussMasterTech, ASE Certified Technician
Category: Chevy
Satisfied Customers: 791
Experience: 19 years of GM Dealership experience. ASE Master with L1 and GM Master Certified in Electrical
RussMasterTech and 12 other Chevy Specialists are ready to help you
Customer: replied 6 years ago.
Reply to RussMasterTech's Post: Thanks. I did do that (check for the air), when the Radiator flush was done, that was the problem. So it went to a mechanic who took the air out. That was before the water pump went out. Now he's saying that its a wiring issue with the electronic heat sensor (or something), and as a result, the fan (high) isn't kicking on when the engine gets hot and then the temperature gauge goes over
Expert:  RussMasterTech replied 6 years ago.

Ok.

I don't think he's going down the right path. The sensor that he is reffering to is the ECT or Engine Coolant Temp sensor. This sensor responsible for telling the computer how hot the engine coolant is AND to let the Instrument cluster know how how hot the engine coolant is. If the gauge is working, then the computer is getting the signal. If the fan is not coming on, there could be a problem with the fan or the relay.

Does the service engine soon lamp some on? If so, did he tell you which code has set? This might help me understand where he's coming from.

Russ

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:

 
 
 
  • Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    6870
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Chevy Technician

    Satisfied Customers:

    5404
    15 years GM master tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Master A.S.E Automotive technician

    Satisfied Customers:

    4071
    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Chevy Mechanic

    Satisfied Customers:

    2306
    Shop Owner and Mechanic on multiple makes.
  • http://ww2.justanswer.com/uploads/goodwrench9124/2008-11-09_220838_dscf0007.jpg goodwrench9124's Avatar

    goodwrench9124

    ASE Certified Technician

    Satisfied Customers:

    2041
    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    1912
    18+yrs experience. State Inspector and Chevy Diagnostics