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 JHoop Your Own Question
JHoop, Pontiac Technician
Category: Pontiac
Satisfied Customers: 5446
Experience:  14 Year Engine Builder,16 years as a Tech HvyLine, Suspension, Electrical, Brakes, 6 Year Shop Owner
Type Your Pontiac Question Here...
JHoop is online now
A new question is answered every 9 seconds

1998 Pontiac: I flushed the radiator..right cooling fan..van is hot

Customer Question

I am having overheating problems with my 1998 Pontiac Transport when traveling at slow speeds in Traffic. I flushed the radiator and it was still overheating. Then I and replaced the right cooling fan because of a warped fan blade, and now I can't get the fans to come on when the van is hot. It was showing DTC faults for both Relays, and I've cleared the codes, switched out the relays and replaced the fuses, but how do I make sure that the circuits are functioning correctly?

The thermostat appears to still be functioning well, as both hoses are hot when running and it doesn't overheat when travelling above 15 km/h, but I don't know what else to do to correct this overheating problem. I've been avoiding peak traffic times in order to avoid traffic jams, but I'm afraid there's still something wrong, and with summer temperatures just around the corner I want to fix everything now. What else could be wrong and what do I need to do to check?
Submitted: 5 years ago.
Category: Pontiac
Expert:  JHoop replied 5 years ago.
Hello , my name is XXXXX XXXXX thank you for choosing Please tell me all the problem as my answers are based on the information you provide.

Can you give me the codes?
Customer: replied 5 years ago.
I had to use my scanner on another vehicle after I cleared the codes on the van, and I don't have them written down. There were 3 different codes, two for Fan Relay circuit 1, and one for Fan Relay circuit 2. The faults haven't come back on (yet), but the fans aren't coming on either.
Expert:  JHoop replied 5 years ago.
You have the factory charts?
Customer: replied 5 years ago.
No, I have a CanOBD2 scanner with enhanced DTCs, but not the factory charts. I did talk with my normal technician for a few minutes this morning but he was too busy to take it in for the next week or two.
Expert:  JHoop replied 5 years ago.
I uploaded the procedure in .pdf format here to justanswer. You can download it by CLICKING HERE and HERE. I hope this helps you.

If you need more help, please ask. If this answer helped you, please click ACCEPT. If you have an extended plan you will not be billed again yet I won't get credit unless ACCEPT is pressed.

Your question is always open and you can get back to me at any time by answering any e-mail related to this question or by simply logging on to your JA account and go to your questions. God Bless

Please leave positive feedback. As you can see I have excellent ratings in all my categories. Also remember I am not at the vehicle, Please don't leave a negative report. Thanks again, JHoop
JHoop, Pontiac Technician
Category: Pontiac
Satisfied Customers: 5446
Experience: 14 Year Engine Builder,16 years as a Tech HvyLine, Suspension, Electrical, Brakes, 6 Year Shop Owner
JHoop and 4 other Pontiac Specialists are ready to help you
Customer: replied 5 years ago.

Thank you for the information to check the relay circuits. That answers part of my question, the other part is what steps do I take to check that the cooling system is intact and what else do I look at if it overhears again?



I am worried that there may be a head gasket leak, but A) I'm not, or at least have not been losing coolant (I hadn't needed to top up the overflow reservoir for more than 6 months of daily driving, and the rad was still full when I flushed it), B)the oil is clean and there are no signs of cross-contamination, and C) the exhaust is occasionally white upon startup but not noticeable at any other time (seems to be mostly related to atmospheric conditions).



I did try looking at the coolant in the rad with the engine under strain, and there were a few bubbles, but it seems inconclusive. I know I can do a leak-down test, but I'd rather test everything else before resorting to this (these minivans are not the most convenient vehicles to do engine work on, even pulling the plugs is a hassle.)



Before the rad flush, I had occasionally had problems with overheating on the highway. Usually I'd pull over and turn the heater on inside the car and it would cool down. However, I'm wondering, could this also be related to the water pump? How do I know/check? (The hoses don't seem to be running "full", but they are running hot, and under most conditions the temperature gauge stays around normal operating temps.) As mentioned previously, I did try to empty any air pockets by using the bleed valve near where the top hose connects to the thermostat inlet. (It didn't seem to work at all, though if I squeezed the top hose with the bleed valve open a small amount of coolant would come out.)



I know, there are really many questions. I just really want to make sure this van is working because I was planning to use it to move to a different province later this summer. After that, I'm ok if it goes to the scrap yard, as I have already purchased another vehicle, but I'd like to preserve it's life until at least August.



Expert:  JHoop replied 5 years ago.
It is obvious you will not accept my answer.

I'm going to put your question back up and see if anybody else has any info on this. Sorry I couldn't help you further. I'm sure someone will be with you shortly. Thanks again for choosing justanswer! JHoop
Customer: replied 5 years ago.
Customer: replied 5 years ago.
I re-posted my question along with the things you'd suggested I check, and it took several more rounds of electrical testing to figure out that the PCM is not registering the engine coolant temperature sensor as it's supposed to be when it gets over 108º C. Guess I need a new computer.

I do appreciate your help, guess the problem was deeper than either of us guessed.
Expert:  JHoop replied 5 years ago.

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.