Question about 1998 Pontiac Grand Prix

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Will the 15794785 cowl water deflector fit a 98 grand prix gt

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

davidg65
  • 26 Answers

SOURCE: 2002 Pontiac Grand Prix Thermostat

as you face the engine the thermostat bell is on the right (drivers side) Follow the radiatoe hose. Remove the two bolts and raise the bell still attatched to the hose. the thermostat is there with the rubber seal. You can gently pry the thermostat out with a screwdriver or something similar. Put in new thermostat be sure it is the same as the old one, and then replace or change the seal (be sure it is the smae size and thickness as the old one as I got the wrong size from Napa) Then replace the bell, and tighten, but not over tighten. I hope this helps!

Posted on Jan 31, 2009

  • 3 Answers

SOURCE: jack position to change rear tire 98 pontiac grand prix

factory jack to be placed in front of tire inbetween notches on seem. A manual floor jack can be used placing it under center connection bracket for rear wheels. Be shure to block front tires when using floor jack and have car in gear if a manual or park if automatic transmision.

Posted on Mar 31, 2009

outdoorsman5
  • 631 Answers

SOURCE: Where Is The Camshaft Position Sensor Located On

Front of engine above crankshaft pulley. If you need a picture of it send me your email address and I will send you a picture.

Posted on Sep 10, 2009

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motor1258
  • 6674 Answers

SOURCE: spark plug gap for 2005 pontiac grand prix gt 3.8

.060 thousandths of an inch.

Posted on Nov 19, 2009

  • 84 Answers

SOURCE: I have a 2004 grand prix gt and sometimes on start it stalls

Take your car to a dealer and tell them to "clean the throttle body" Known problem for this year. It will solve your issue.

Posted on Dec 30, 2009

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1 Answer

What other windshields will fit 98 grandprix


other then

Jul 22, 2014 | 1998 Pontiac Grand Prix

1 Answer

Can I replace my 98 grand prix driver's seat with


You can replace it as long as the one you are replacing is the same set-up. If you have a manual adjusting seat and replace it with a power seat it will fit but you wont have the hook ups for it. Also make sure if it is a bucket seat (single person) you dont replace it with a bench (3 persons fit in front) seat or you will run into problems with the center console and shifter. vice versa may bolt up but there will be a gap between the 2 front seats

Nov 22, 2011 | 1998 Pontiac Grand Prix

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Gets water on passenger side floor when A.C. is on. 2003 grand prix GTP


Your AC drain is clogged. If you look near the floor under the dash on the passenger side you will find a small rubber hose that goes thru the floor board. Take the hose off and clean it out. You will find that it is clogged with dirt. Once it is cleaned out hook it back up under the dash. You will notice that if the car is running with the AC on, you will be able to see water dripping on the passenger side under the car that will mean you cleaned the hose out and it is working.

Jul 10, 2010 | 2003 Pontiac Grand Prix

1 Answer

My 1997 grand prix leaks through the blower motor when it rains. I took the cowl off and you can see right into the blower motor. Is there supposed to be a cover over the blower motor intake.


Hello, you will need to install a part called a deflector.

here is a picture and the part number

15212454
Deflector-Plenum Water
15212454
Deflector-Plenum Water

15212454
Deflector-Plenum Water



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Jun 20, 2010 | 1997 Pontiac Grand Prix

1 Answer

What years 3.1 engine will fit in 1998 pontiac grand prix


Unfortunately it's a (relatively) one year only engine (without major component changes). However, these will fit without those changes:

'97, '98, '99 Buick Century,

'98, '99 Lumina (car),

'98, '99 Grand Prix,

'99, Monte Carlo.

This is assuming that you have an (8th digit) "M" VIN. Off the top of my head.


Mar 07, 2010 | 1998 Pontiac Grand Prix

1 Answer

92 grand prix 16" rims (factory)


no go to a junk yard and they will tell you what will fit

Oct 07, 2009 | 1992 Pontiac Grand Prix

2 Answers

Water on floorboard on passenger side I don't think it is from rain.


It could be that the condensation drain line is blocked and backing up into the car - but; it is more likely that your problem is a result of a poorly designed cowl cover over the blower fan for your air conditioner. this is a VERY common problem on 97-03 Grand Prix's as well as Malibu's and Impalas through '04. The other side effect of this is that water draining into the blower fan WILL cause it to fail eventually - this solution eliminates that risk.

Here is the cowl (pictures from an '04 Impala, FYI, but are identical):
d459ff7.jpg
You will need to remove it by pulling the retaining clips up - there is 1 on each end, and then one towards the top that has a slot in it. Be careful to not break these or lose them.

Remove the cowl, and underneath you will see the blower fan:

42f0c7e.jpg
Under the cowl you will see a rubber seal that is indicated by the arrow - this is the poorly designed "drip edge". You can either remove it - or leave it in place; the new diverter will accumulate any moisture captured by this seal and divert it properly.

Here is a picture of the part you need - which can be purchased from any GM dealership for about $4 - the GM part is #15794785. Most dealerships don't stock it - but they can order it for you.

1e4d9df.jpg
It simply sits in place as noted by the arrows - you'll notice there is a long extension from the left side of the part - this is the "finger gauge" - you want this to be positioned as far towards the left (as your facing the motor, or passenger side) of the vehicle as possible.
5cc4d0e.jpg
Here is a close-up of the gauge to give you perspective on how it should be positioned:

589f077.jpg
This is a shot of the drain area that the new diverter will use - instead of dumping water into the blower fan like the old design.

2ec9540.jpg
Now - for the cowl to fit over the new diverter - you will need to trim a couple of pieces of plastic from the bottom of the cowl - as indicated:

d051bff.jpg
You can simply use a utility knife and a pair of pliers to score and snap these pieces off.

b67ac22.jpg
65a56ed.jpg
What the underside of your cowl should look like after removing (lines indicate where plastic was removed)

19b73aa.jpg
No you can simply replace the cowl, and reinstall the retaining clips - and you are all done.

Hope this helps - be sure to rate it and comment! ;)

KC GTO Dad

Sep 24, 2009 | 2004 Chevrolet Malibu

2 Answers

In the past I have had major water leaks in my 2005 grand prix. I never knew wehre the water came from. Now, I can hear water under my car shifting whenever I turn a corner. Where is it coming from??


Do you have a sun roof? I imagine you do.

Under the roof cover there is a tube on each side of the car that drains the sunroof area to the ground. Either a tube has been disconnected or come loose. This will cause severe mold and mildew problems if not fixed soon.

Jun 06, 2009 | 2005 Pontiac Grand Prix

2 Answers

2005 GRAND PRIX HEATER MODULE


http://www.grandprixforums.net/f73/water-floorboard-take-2-permanent-fix-6961.html Here is a link that I found over the weekend as I was getting water dripping onto the passenger side floorboards from the heater motor while in the car wash. The part # in the attached link is 15794785. This is a GM # for a deflector that fits under the cowl. Hopefully this helps you.

Mar 21, 2009 | 2005 Pontiac Grand Prix

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