Engine Overheating

acturner
40

Asked by Sep 23, 2007 at 06:27 PM about the 1998 Pontiac Grand Prix 4 Dr GTP Supercharged Sedan

Question type: Maintenance & Repair

I have changed the thermostat and the water pump on a 1998 Pontiac Grand Prix GTP.  The temp needle still goes in the red...any suggestions?

14 Answers

crazzy450r
965

you allmost deffinetly have a blowen head gasket do a compresion test. "notorios problem on almost all turbo charged and supercharged engins"

4 out of 4 people think this is helpful.
18TandSVT
4,705

This might be a dumb question, but did you change the coolant when you did this work?

acturner
40

Yes we did. We fixed it. Thanks

4 out of 4 people think this is helpful.
usaboy
70

what did you do to fix the problem?

7 out of 7 people think this is helpful.
tom2112
100

I have the same car and same problem 98 grand prix GTP 3.8 l changed the head gaskets intake had a head shop check the heads and intake new thermostat and coolant tempature sensor. Still goes to RED?? is there a way to check the water pump? What else could it be?

10 out of 10 people think this is helpful.
Michael McGrail
8,915

I am curious why nobody ever changes the radiator cap first. Makes no sense to me. A $3 part that 9 times out of ten is always the problem.

5 out of 5 people think this is helpful.
specialtodd
30

i think you need to try intake gaskets they are famous for going out or even your radiator could be plugged reducing coolant flow

2 out of 2 people think this is helpful.
specialtodd
30

radiator could be plugged

1 out of 1 people think this is helpful.
Wowwie21
40

I have 98 grand prix also running hot what should I do???

4 out of 4 people think this is helpful.
Rob Pfrommer
60

lol wow i joined the club today 2 changed everything water pump all new hoses thermostat,new radiator cap new coolant and still running hot any 1 find the fix yet

6 out of 6 people think this is helpful.
Michael McGrail
8,915

Rob, what temperature thermostat did you use? Also, have you inspected the system for coolant leaks?

tenspeed
86,975

The Pontiac V6 has to have the air bled out to cool properly. If you are looking for a overheating cure, bleed the air out. --- http://www.gaownersclub.com/forum/faq.php? faq=maint_repair#faq_cooling_serv

8 out of 8 people think this is helpful.
mcsteven769
60

If your Pontiac is overheating, first make sure the electric fans are coming on. This flaw should have been a recall. Its a good idea to change the thermostat and temp sender unit. Cheap fix. Make sure you bleed the system. 2000 GP 3.1 has 2 bleeders. If the car only over heats while sitting in traffic, most likely the fans aren't coming on. Pull over and pop the hood, check the fans. The temp sender unit tells the ECM module to turn on the fans. So it could be either. These cars are known for head gasket issues. But really its the cooling system that causes over heating which causes head gasket failure. So don't ever let it get hot enough to get into the red. Turning on the AC turns on the engine cooling fans on a 2000 Grand Prix, and probably other models.

6 out of 6 people think this is helpful.
stephanietacoma
50

How do I Figure out if I find Out if iI have a blown head gasket on 77 pontanic grand prix .sj with 400 cu in Engine

4 out of 4 people think this is helpful.

Your Answer

Add photo

Related Questions

  • overheating 2 answers

    my car keeps overheating, I've already replaced the cooling elbows, thermostat, and the water pump. However the over heating keeps reoccurring after ten minutes of driving it shuts down. Both the co...

    2007 Pontiac Grand Prix Base

    -

    Maintenance & Repair

  • overheating 8 answers

    I've changed the water pump, thermostat, radiator, and the radiator cap and the car still overheats because water is boiling out of the reservoir is this because my head gaskets are blown? there's no ...

    1998 Pontiac Grand Prix 2 Dr GTP Supercharged Coupe

    -

    Maintenance & Repair

  • Engine OverHeating FYI 5 answers

    It absolutely amazes me how many people are having problems with overheating and yet nobody suggestes changing the radiator cap. If the radiator cap is not functioning properly it allows pressure to b...

    2000 Pontiac Grand Prix GTP

    -

    Maintenance & Repair

  • car overheating 1 answer

    we bought my son a car that needed a water pump replaced. We have replaced the water pump and now the car is overheating with smoke coming up through the console. It is also lossing it's get up and go...

    2000 Pontiac Grand Prix GT

    -

    Maintenance & Repair

  • Overheating 20 answers

    I put alumaseal in my car last week because coolant was leaking but it wasn't on the ground. But my car is still overheating. Is it possible that I have a blown gasket

    2001 Pontiac Grand Am SE

    -

    Maintenance & Repair

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 4,372 nationwide Grand Prix listings starting at $1,500.

ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,570
#2 Tom Demyan
Tom Demyan
Reputation 2,440
#3 munron
munron
Reputation 1,930
View All

Related Models For Sale

Used Pontiac Bonneville"
6 Great Deals out of 869 listings starting at $1,450
Used Pontiac Grand Am"
2,045 listings starting at $500
Used Chevrolet Monte Carlo"
20 Great Deals out of 2,092 listings starting at $2,792
Used Chevrolet Malibu"
1,170 Great Deals out of 66,175 listings starting at $695
Used Ford Mustang"
806 Great Deals out of 40,203 listings starting at $1,450
Used Chevrolet Camaro"
736 Great Deals out of 37,414 listings starting at $3,999
Used Nissan Altima"
1,579 Great Deals out of 82,651 listings starting at $695
Used Honda Accord"
1,314 Great Deals out of 75,291 listings starting at $995
Used Nissan Maxima"
430 Great Deals out of 22,879 listings starting at $1,500
Used Jeep Grand Cherokee"
1,191 Great Deals out of 74,067 listings starting at $1,200

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
25 Great Deals out of 541 listings starting at $2,251
2007 Pontiac Grand Prix For Sale
604 listings starting at $2,999
2006 Pontiac Grand Prix For Sale
4 Great Deals out of 759 listings starting at $1,900
2005 Pontiac Grand Prix For Sale
7 Great Deals out of 493 listings starting at $1,895