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 Your Auto Inspector Your Own Question

Your Auto Inspector
Your Auto Inspector, Assistant Service Manager
Category: Car
Satisfied Customers: 874
Experience:  Tires Plus
10675526
Type Your Car Question Here...
Your Auto Inspector is online now
A new question is answered every 9 seconds

I have a Pontiac Grand Am with a 3400 V6 engine. It

Customer Question

I have a Pontiac Grand Am with a 3400 V6 engine. It is loosing coolant. The coolant is comming out of the overflow line next to the colant fill cap. I replaced the coolant cap with a new one because the old one had a bad "O" ring on it but ie runs and looses coolant from the coolant over flow line by the coolant cap. The engine temp comes up to 200 deg F and sits there after it warms up. Any ideas on what is the problem.
Submitted: 6 years ago.
Category: Car
Expert:  Tristan Franklin replied 6 years ago.

start car and turn a/c on full cold and high fan speed, make sure coolant fans are on, if not check fuses and switch around relay if all is ok, replace the fan. now from a cold engine, start it up hand feel all hoses looking for a warm to cool hose are area when everything else is heating up, this will indicate a air pocket or restriction, if warm to cool by thermostat outlet hose, replace thermostat. if coolant is really dirty replace or repair radiator. if all checks good suspect blown head gasket. good luck i hope i helped and please accept if satisfied. thanks T-MAN

Customer: replied 6 years ago.
Reply to T-man's Post: If the head gasket was blown it would have a moisture fog comming out of the exhaust when it runs after warms up but it does not. The motor comes up to 200 degrees and regulates there but it continues to loose coolant out of the overflow hose at the coolant fill cap on the top of the coolant tank.
Expert:  Tristan Franklin replied 6 years ago.

white tail pipe smoke comes from coolant in the cumbustion chamber, engine overheating in some cases are cause by worn or damages head or gasket allowing gasses to be pushed threw the coolant system

Customer: replied 6 years ago.
The engine temperature is only coming up to about 200 degrees where the thermostat is opening so I do not think that it is overheating. There is no white tail pipe smoke coming from the tail pipe. There is a slow leak of coolant out of the overflow hose at the coolant cap. The cap was replaced so I think that the new coolant cap is OK. I was told that this was a intake manifold gasket leak and that the fuel in the coolant will cause to lose its cooling properties. I have been told that the head gasket will cause the white tail pipe smoke which the car is not doing and that the coolant will come gushing out of the coolant system once it comes up to temperature and not just leak out a little at a time. I have not heard of the intake gasket leak before. If the head gasket was gone a compression test of each cylinder should show low compression on that cylinder with the leaky gasket should it not.
Expert:  Your Auto Inspector replied 6 years ago.

This is a common problem when you have an intake gasket leak. The intake manifold can leak coolant into one of the oil passages or externally. You are correct that the vehicle will pass a compression test if the intake manifold gasket is leaking.

Your first step should be to confirm the intake leak by pressure testing the coolant system to verify the leak. If no external leak is found then you should pull the oil dipstick and verify that there is no coolant mixed with the oil.

There is a Technical Service Bulletin to replace the lower intake manifold gasket with an updated gasket.

Here are the updated parts required for the repair:

graphic

Here is a diagram of the lower intake manifold

graphic

 

Here is the procedure to replace the intake manifold gasket:

Remove the upper intake manifold. - Upper.

Remove the valve rocker covers.

Remove the fuel rail with injectors and position aside.

Disconnect ECT.


Remove the power steering mounting bolts. Position the pump aside.


Remove the inlet cooling pipe from the coolant outlet housing.

Remove the heater by-pass at the coolant pump and the cylinder head.

Remove the radiator hose from thermostat housing.

Remove the water outlet housing. Important: Retain the washers in the same orientation on the center bolts.

Remove the lower intake manifold bolts.

Remove the lower intake manifold.

Loosen the rocker arms. Important: Keep the pushrods in order. The pushrods must be installed in the original position.

Remove the pushrods.


Remove the intake gasket.

Inspect the flatness of the inlet flanges.

Clean the following items:

    • Gasket material from the mating surfaces
    • Excess RTV sealant from the front and the rear ridges of the cylinder
    • The block
    • Sealing surfaces Use degreaser in order to clean the sealing surfaces.

graphic

graphic

graphic

graphic

Please let me know if there is anything else that I can do to assist 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 would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician
 
 
 
Chat Now With An Auto Mechanic
Your Auto Inspector
Your Auto Inspector
Auto Mechanic
874 Satisfied Customers
Tires Plus