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 Joel Your Own Question

Joel
Joel, GM Dealer Technician
Category: Pontiac
Satisfied Customers: 1599
Experience:  18 years plus at same GM dealer.
Type Your Pontiac Question Here...
Joel is online now
A new question is answered every 9 seconds

Pontiac Montana: 2004 Pontiac Montana: original problem was

Resolved Question:

2004 Pontiac Montana: original problem was heat would go to luke warm when idiling, and fine while driving. it would be low on coolant. i'd fill it up and would be fine.

took it in to find out why it was going low on coolant, and ended up being intake manifold gasket. they replace that along with thermostat and heater core. got it back and no heat to front of van at all, fine in the rear. 7-10 days later after no heat to front of van, now every once in awhile the front heat will be fine, then on the way home from running errands, again back to barely even warm air blowing. it seems like the air is warmer on lower fan speeds when it does work, and turning the fan up higher turns it to colder air blowing out. the couple of times the front heat did work, it was like the original problem of low heat when idiling at a red light and fine when you are driving. i need diagnostic help to rely to the shop that is literary leaving me in the cold help so i can get my wife heat taking our kids to and from school
Submitted: 1 year ago.
Category: Pontiac
Expert:  Joel replied 1 year ago.

Hello and welcome.

It does sound like you are still getting air in the cooling system. The problem of no or little heat at idle is a result of air pockets. When the engine is at a higher RPM, more coolant is flowing, so more heat.

The low coolant because of a leaking intake manifold gasket is a VERY common problem, but sometimes the shop overlooks the fact that there may be additional problems, namely- the rear head gasket.

When they fail, it give the exact problem you are talking about.

Joel, GM Dealer Technician
Category: Pontiac
Satisfied Customers: 1599
Experience: 18 years plus at same GM dealer.
Joel and 4 other Pontiac Specialists are ready to help you
Customer: replied 1 year ago.

so why is the heat to the rear fine?

Expert:  Joel replied 1 year ago.

For some reason the air pockets never make it back to the rear heater core. I believe it has to do with the way the hoses are run, the air always gets into the front core.

You may be able to see air bubbles in the coolant with the cap off and running at idle. Removing the passenger side rear spark plug may show signs of burning coolant.

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
< Last | 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:

 
 
 
  • Dave Nova

    Pontiac Technician

    Satisfied Customers:

    1917
    ASE Master Certification. GM World Class Certification
< Last | Next >
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Pontiac Technician

    Satisfied Customers:

    1917
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/PE/peterpete190/2012-2-24_1274_20120215135406.64x64.jpg Pete's Avatar

    Pete

    Pontiac Technician

    Satisfied Customers:

    1243
    15 Years Pontiac Technician and training.
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Pontiac Technician

    Satisfied Customers:

    943
    15 years GM master tech/15 years ASE master
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Pontiac Tech -

    Satisfied Customers:

    570
    18+yrs experience. State Inspector and Pontiac Diagnostics
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    GM FACTORY CERTIFIED TECHNICIAN

    Satisfied Customers:

    514
    ASE A1-A8 w/L1 GM master technician.Factory certified/40 years experience
  • http://ww2.justanswer.com/uploads/Rocket2005/2009-09-13_133703_jack.jpg car tech's Avatar

    car tech

    ASE Certified Technician

    Satisfied Customers:

    446
    25 years master tech and shop owner
  • http://ww2.justanswer.com/uploads/MO/molurch/2012-6-6_214526_500.64x64.png Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Pontiac Mechanic

    Satisfied Customers:

    441
    GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.