Question about 1996 Buick Riviera

1 Answer

Water leaking from rubber elbow on intake manifold passenger side of motor

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 273 Answers

It could be the intake gaskets, or it could be that the upper intake is starting to fail. Both are common problems. How fast are you losing coolant? If it's fast, then it may be the upper intake. Also, how many miles are on it, and has the upper intake been replaced before? It may be due for a new one.

Anyway, the procedure for doing the gaskets and for replacing the upper intake are exactly the same, except that if you replace the upper intake, you put on the new one instead of reinstalling the old one. I've done this with mkaake over a couple of days. There's a lot to remove and replace, but nothing that's especially hard to do. Have a service manual of some kind on hand, and do some serious research before you take it apart.

Parts you'll need:

1) Upper intake gasket set
2) Lower intake gasket set (make sure it's the new upgraded version, with metal inserts)
3) Plastic coolant elbow (it's under the alternator, and rarely comes off in one piece. It's also a dealer part, so if you're doing this on a Saturday and the dealer is closed... you get to wait until monday to put it back together - unless you get one ahead of time)
4) Fuel injector O-rings (might as well replace those while you've got them out anyway)
5) Carb/TB cleaner - several cans (you'll want to clean up the upper and lower intakes, and the TB while you've got them off)

That's all I can think of right now. I also don't know prices. Maybe someone else will have that info.

Posted on May 17, 2011

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer


It could be alot of things causing this....But check for a vacuum leak behind the intake manifold. There is a rubber elbow that splits. Could be a Idle air control motor. Good Luck

Nov 14, 2012 | Ford Cars & Trucks

1 Answer

Engine starts and runs, best when cold. Then it begins to stumble, almost like it's not firing on all cylinders. Backing off on the throttle eliminates the stumble, then you can advance the throttle slowly...

if it's a 5.4 litre engine then i would advise u to check the hose that goes to p.c.v. valve to intake manifold. on back side of intake manifold there is a rubber elbow connector that deteriorates. get one from dealer cost is roughly 20-40 bucks. that deteriorated rubber elbow causes a vacuum leak.

Jan 15, 2011 | 1992 Ford F350

2 Answers

Do u have to drop the tank to replace fuel pump or can u go through trunk

The fuel tank does not have to come out.Just go in the trunk and remove the spare tire and remove the trunk liner.You will see an oval towards the front of the trunk with about 5 bolts on it.Remove these bolts and then you will have access to the fuel pump.It is better if you drain the fuel or at least partially drain it so you don`t get it all over the vehicle.Remember fuel is very flameable,do not smoke or have any spark near fuel tank.Hope this helps and good luck.

Oct 26, 2010 | 1996 Buick Riviera

1 Answer

I have a 98 Olds Intrigue. It is leaking coolant and water from somwhere on the passenger side of the motor. Replaced water pump and radiator is fine. Any ideas?

Depending on what engine you have, the 3.8 has a plastic elbow coming out of the lower intake manifold that goes to the belt tensioner assembly, which has 2 hoses coming out of it for the heater hoses. That elbow likes to crack. The older 3.8 has a nipple there which also likes to crack that runs to the heater core. Either way that's where i'd be checking first.

Oct 20, 2010 | 1998 Oldsmobile Intrigue

2 Answers

1999 Pontiac Sunfire Leaking water in Passenger Interior

The evaporator drain is plugged with debris and filling up the heater case. Remove the 90 degree elbow and clear the drain hole at the case.(pencil or piece of wire) You will know that's it when it dumps out a half gallon on the floor. Be sure to reinstall the elbow to keep out rain/ road spray.

Feb 23, 2010 | 1999 Pontiac Sunfire

3 Answers

Water leak on passenger floorboard also an ac problem

probably leaking heater core. you may have low coolant level now. the only place water comes in the cabin is for the heater, that has got to be it. the heater core can be bypassed (like my car's is) by simply cutting the hose that leads into the car and leave about a foot, make a big U out of it and plug the other side of the hose into the coolant passage that returns from the heater core and leads into the intake manifold. pretty easy you will need a knife, hose clamps, and common sense. the third one is a little harder to come by! :)

Oct 10, 2009 | 2002 Dodge Grand Caravan

2 Answers

Water from airconditioner leakinging into floor a199 fter beinging driven very long, thanks 1999 cadilac develle

you have a plugged ac condensation drain, it is under the car at very bottom of engine firewall on the passenger side, a 1/2 inch tube with a rubber flappper valve in it, remove the flapper and clear it with a coat hanger, the usual cause of plugging is leaf matter from the air intake just below the windshield

Jul 08, 2009 | 1999 Cadillac DeVille

2 Answers

My Navigator is running lean in bank 1 and 2 how repair myself?

why is my navigator running lean thats why my check engine light is on

Jun 27, 2009 | 1999 Lincoln Navigator

2 Answers

Pontiac Grand Am cooling system

A rubber elbow coming out of the firewall is probably the a/c evaporator drain. However, the heater core could be leaking and entering the evaporator case and coming out of that drain. Are you sure coolant is coming out of that elbow and not plain water?

May 09, 2009 | 1994 Pontiac Grand Am

1 Answer

OBD codes P0171 and P0174

Look on the passenger side of the intake at the rubber elbow attached to the big black plastic tube and then to the intake manifold. Make sure it is not sucking shut and maybe a small hole in the bottom of it.

Mar 20, 2009 | 1998 Ford Expedition

Not finding what you are looking for?
1996 Buick Riviera Logo

142 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts


Level 3 Expert

75817 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8180 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides