Coolant elbow not sealing - 1999 Pontiac Grand Prix

20

Asked by Apr 18, 2016 at 12:31 PM about the 1999 Pontiac Grand Prix 4 Dr SE Sedan

Question type: Maintenance & Repair

My husband and I just replaced the upper and lower manifold gaskets in our 1999 Pontiac Grand Prix to fix a coolant leak, and it seems to have worked. However we also replaced the coolant elbow by the alternator while we were in there but it won't seal. There's tons of coolant coming out around the seal where the elbow goes into the manifold. Could the part be bad? Could it just not have been installed quite right? Visually it looks good and it all fit together fine so we're a little baffled here.

8 Answers

570

That motor a 3800 3.8? Are you talking about the plastic elbow that goes from the intake to the tensioner? Did you Make sure that you put the orings on both sides of the elbow. If not that's why it's leaking!

1 out of 1 people think this is helpful.
20

Yeah it's a 3800 3.8L, and that's the elbow I'm talking about. The o-rings were on both sides of the elbow, I wonder if maybe they're not sealing? They looked fine visually when we installed but since the coolant is leaking around the outside of the elbow it seems like the o-rings are the issue. Would putting some RTV on the o-rings be a good idea?

216,825

I always use some coolant on the o-ring to help lube it and help it slide on and fit properly on the connection, maybe you don't have it on all the way?

1 out of 1 people think this is helpful.
570

Just like Tom said, if those o rings are not seatin right it will cause it to leake. Put some coolant on both o rings an that will work.

1 out of 1 people think this is helpful.
35,055

Never use RTV on O'rings. Coolant, oil or grease will work.

1 out of 1 people think this is helpful.
20

Okay, will do - thanks all!

570

Your welcome, Good luck!

20

Well we discovered one of the new o-rings basically broke in two already so we replaced the part, got it in there, no leaks at all -- but now the engine is overheating! Hoping it's a thermostat issue or maybe air in the line we didn't get out just yet.

Your Answer

Add photo

Related Questions

  • Need help finding coolant leak on 1999 Pontiac Grand Prix 6 answers

    I've got a 1999 Pontiac Grand Prix 3.8 Supercharger which has had some odd coolant issue for a while. About two months ago I noticed the car seemed hot when running and especially when idling, but the...

    1999 Pontiac Grand Prix 4 Dr GTP Supercharged Sedan

    -

    Maintenance & Repair

  • how do i replace the elbow fitting from the engine block to the water pump 2 answers

    2004 grand prix gtp

    Pontiac Grand Prix

    -

    Maintenance & Repair

  • What is the max milage that a Grand Prix can get? 44 answers

    My grand prix is a 99 and it has 119,000 miles on it. How much longer can it go?

    1999 Pontiac Grand Prix 4 Dr GT Sedan

    -

    Maintenance & Repair

  • Overheating 2004 Pontiac Grand Prix? 6 answers

    I replaced elbows, thermostat, when problem first started i heard a pop in da hood i open it to find coolant everywhere up to car started smoking and begin to overheat since ive replaced the ther...

    2004 Pontiac Grand Prix GT1

    -

    Maintenance & Repair

  • coolant loss on a 2006 grand prix. 5 answers

    06 grand prix, 3800 series 3 motor. coolant dripping under car, no signs of where from under hood. hoses are good, water pump gasket looks good. dripping from passenger side. just wondering what else ...

    2006 Pontiac Grand Prix

    -

    Maintenance & Repair

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 3,814 nationwide Grand Prix listings starting at $900.

ZIP:

Search Pontiac Grand Prix Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,870
#2 Tom Demyan
Tom Demyan
Reputation 2,570
#3 munron
munron
Reputation 2,060
View All

Related Models For Sale

Used Chevrolet Impala
936 Great Deals out of 35,462 listings starting at $1,995
Used Pontiac Bonneville
8 Great Deals out of 669 listings starting at $995
Used Chevrolet Monte Carlo
13 Great Deals out of 1,701 listings starting at $2,000
Used Pontiac Grand Am
1,699 listings starting at $1,000
Used Chevrolet Malibu
1,124 Great Deals out of 82,792 listings starting at $1,800
Used Chevrolet Camaro
475 Great Deals out of 39,917 listings starting at $3,499
Used Ford Mustang
580 Great Deals out of 41,215 listings starting at $1,699
Used Buick Regal
161 Great Deals out of 11,415 listings starting at $1,995
Used Nissan Maxima
413 Great Deals out of 24,331 listings starting at $1,895
Used Jeep Grand Cherokee
1,000 Great Deals out of 65,966 listings starting at $1,500
Used Nissan Altima
1,071 Great Deals out of 82,291 listings starting at $1,900

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
14 Great Deals out of 472 listings starting at $900
2007 Pontiac Grand Prix For Sale
519 listings starting at $1,997
2006 Pontiac Grand Prix For Sale
3 Great Deals out of 638 listings starting at $1,550
2005 Pontiac Grand Prix For Sale
458 listings starting at $5,900