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 Greg A Your Own Question
Greg A
Greg A, Master Troubleshooter
Category: Pontiac
Satisfied Customers: 7878
Experience:  Working with Electronics & Cars for 25+ Years
Type Your Pontiac Question Here...
Greg A is online now
A new question is answered every 9 seconds

2001 Pontiac Montana: engine temperature..cruising..highway speeds

Customer Question

I have a 2001 Pontiac Montana. I'm having issues with engine temperature and I suspect it is just in need of a thermostat but want to be sure. If we are cruising at highway speeds the temperature is in the normal range. If we are at street speeds, the temperature approaches red line.
Submitted: 7 years ago.
Category: Pontiac
Expert:  Greg A replied 7 years ago.

Hello & Welcome,


Can you tell me what the "normal range" is on the gauge?


Have you checked to see if the radiator cooling fans are working?



Customer: replied 7 years ago.
actually I don't know the exact temperature but the midline on the guage. If you need the exact temp I can look when my daughter gets home and get back to you. No where are the cooling fans?
Expert:  Greg A replied 7 years ago.

Hi again,


Middle of the gauge sounds about right for normal operation. I don't suspect that you have a thermostat problem because that is where the gauge should be.


The cooling fans are mounted behind the radiator. There is a possibility that they are not coming on at the right time because of either a fan problem or a relay problem.


Here is a site that talks about the cooling system fans on a similar GM van (identical really). It gives details including schematics of the system along with relays and fuses involved. I would check that system to make sure everything is working properly.


One other thing you can try is to turn on the AC system and see if the temperature comes down after a couple of minutes. This is assuming that the AC system is working properly because switching on the AC will also cause the fans to run.


I would also check that the cooling system is absolutely full, when the engine is cool. This should be checked at the radiator cap and the coolant should be right up to the very top. Also, the overflow bottle should be about half full at all times, or at least between Full Cold and Full Hot marks on the bottle.


I hope this helps. Please let me know what you find or if you need more information.


Take Care, Greg A.

Customer: replied 7 years ago.
OK I'll check the fans, I know the AC isn't working (its blowing hot air and I just assumed it was because I needed to have the freon recharged). However my concern is when we are driving at city speeds - about 40 mph - The guage is actually hovering one tick or so below red line.
Expert:  Greg A replied 7 years ago.

Hi again,


For the AC not working, it could be because the cooling fans are not working, but then the AC would work at highway speeds. There could also be a freon leak. The condensers on these particular years (mounted in front of the radiator) were prone to a leak developing at the lower passenger side of the mount. There was a bulletin out to use a different style mount so that wouldn't happen.


But I would definitely recommend checking that cooling fan system. The fans have the job of keeping air moving through the radiator at lower speeds, and if they are not working, it could cause this problem.


Thanks, XXXXX

Customer: replied 7 years ago.
Thanks. I'll take a look. The AC doesn't work regardless of speed. so must be the leak you mentioned.
Expert:  Greg A replied 7 years ago.

If you have had the freon leak out, it is a good possibility that the condenser had/has that problem. Here is another picture of a leaking condenser in the spot I mentioned.


Please let me know what you find related to the fans.


Take Care, Greg A.

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... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...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
< Previous | Next >
  • 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
  • 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. Diane Dallas, TX

Meet The Experts:

  • GM Tech (Cam)

    GM Tech (Cam)

    Pontiac Technician

    Satisfied Customers:

    GM Grand Master Technician 2007. 14 years experience.
< Last | Next >
  • GM Tech (Cam)'s Avatar

    GM Tech (Cam)

    Pontiac Technician

    Satisfied Customers:

    GM Grand Master Technician 2007. 14 years experience.
  • Dave Nova's Avatar

    Dave Nova

    Pontiac Technician

    Satisfied Customers:

    ASE Master Certification. GM World Class Certification
  • Pete's Avatar


    Pontiac Technician

    Satisfied Customers:

    17 Years Pontiac Technician and training.
  • Gary's Avatar


    Pontiac Technician

    Satisfied Customers:

    15 years GM master tech/15 years ASE master
  • Ron Z.'s Avatar

    Ron Z.

    - Pontiac Tech -

    Satisfied Customers:

    18+yrs experience. State Inspector and Pontiac Diagnostics
  • John's Avatar



    Satisfied Customers:

    ASE A1-A8 w/L1 GM master technician.Factory certified/40 years experience
  • Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Pontiac Mechanic

    Satisfied Customers:

    GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.