Question about 1999 Pontiac Sunfire

3 Answers

My son's 1998 Pontiac Sunfire wants to overheat. He let it run for 10 minutes and it was in the red, has not driven it since then. His brother checked the fluids and all is ok. We believe it's the thermostat. But where is it located? Behind the motor? Do you know where I can print a diagram of where it is or how to change it. This is the mom, my ex, his father is too busy at the bar so I want to take this on and get it fixed without his drunk ****. Thank you

Posted by on

  • 10 more comments 
  • realtrueme Jan 01, 2009

    thank you motor1258. I don't know what my other son did to check it. I thought we would just change the thermostat and see what happens. It's so cold outside and it's really hard to do too much and I can't afford to take it in.

  • realtrueme Jan 01, 2009

    It's a 2.2 engine. It overheats just sitting and idling. I don't dare let him drive it to see if it overheats going down the road.

  • realtrueme Jan 01, 2009

    We are going to go do that right now.

  • realtrueme Jan 01, 2009

    Well, his older brother came over and took the thermostat out and they ran to buy another. We'll see what this does. I told him to call his older brother "dad", and to call his dad by his name....

    Will keep ya'all updated on this....thank you so much thus far.


  • realtrueme Jan 02, 2009

    Ok, so now the new thermostat is in but now we found out that the car takes the Red fluid not green antifreeze. So the radiator is empty now I guess we will just pour some Ded Dex, or whatever that stuff is into there and it should be ready to go right?

  • realtrueme Jan 02, 2009

    Ok.....now there is no heat in the car and the temperature is back in the red like it wants to overheat.....What now????

  • realtrueme Jan 03, 2009

    Ok guys and gals....$150 later the car is fixed. Either my oldest son damaged the thermostat when he put it in or it was bad from the store. Had to take the car in to a shop. But it was the thermostat to begin with from the beginning. All is fixed and on the road again.

    Thank you to all who suggested ideas, I sure learned from this.

    Thank you so much!!!


  • Mike Butler
    Mike Butler May 11, 2010

    Ya please, keep us posted. tell him to make sure to run with cap off & heater on when re-filling system, for 2 or 3 times that the rad fan comes on, unless it overheats before that.

  • Mike Butler
    Mike Butler May 11, 2010

    Do you see or hear a fan come on under hood when running hot?

  • Mike Butler
    Mike Butler May 11, 2010

    Sorry forgot, what engine is in that if you know?

  • Mike Butler
    Mike Butler May 11, 2010

    That's what's great about winter eh, usually problems start when it's too dam cold out to fix em'. Anyway, I'm trying to eliminate, time & dollars spent, changing something that isn't necessary, by asking these questions, so please be patient with me.

    When did overheating start? What has been done since? Does it overheat going down the road, or only when sitting & idling?

  • Mike Butler
    Mike Butler May 11, 2010

    When temperature gauge gets to normal or slightly above, does the cooling fan on the radiator come on and cool as it's supposed to? Did you leave cap off & heater on when you checked coolant level, to bleed out all air trapped in system? Let's see what we can do for this kid eh !

×

3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Pontiac Master
  • 6,674 Answers

Make sure when ready, he runs engine with rad cap off, heater (not defrost) on, and revs it a little every once in a while for 30 seconds or so, to help in flow & air bleed, while it's warming up. Allow rad fan to come on & off 2 or 3 times, before putting rad cap back on, to try & make sure all airlocks are out of there. If it overheats shut it down & let it cool, then try again. (see also "itisb4me 's posting) something to definately keep in mind if this doesn't work for some reason. I have to step out this afternoon for a while, then dinner out, so I'll check back as soon as I can. Good Luck.

Posted on Jan 02, 2009

  • Mike Butler
    Mike Butler Jan 03, 2009

    Can your son tell if he has any circulation in the rad at all, when thermostat should be opening, at normal operating temperature ? How long did it take too heat up ? Any big bubbles from rad when engine running & cap off?

  • Mike Butler
    Mike Butler Jan 03, 2009

    Thanks for getting back to us. As you can see when someone tells us they did it right, we have to assume out of respect if nothing else, that they did. In your son's defense, it wouldn't be the first time for a faulty brand new thermostat, nor would it be the first time that it was installed incorrectly, whether by a rookie, or an experienced mechanic. One small distraction at the wrong time, can do it, just as easy for the inexperienced as the experienced. Hate to hear it cost ya, but glad to hear the kid's up & going. Have a good one, and thanks for letting us know.

×

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I have a pontiac sunfire 1999 and when i first bought it, it did the same thing. It would overheat on idle, not when you were driving though, just when it was stopped. What it ended up being was there was air somehow in the coolant system. It needed to be put on a pessure suction machine to get the air out, that can happen if someone doesn't bleed the radiator correctly when they flush the radiator. It took the mechanic three days to figure it out, we replaced the thermostat and hoses and was about to change out the radiator when he decided to just try suctioning out the air. It was that simple of a fix. I haven't had any problems since. Hope this helps.

Posted on Jan 02, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

Also, check the coolant concentration. If too weak, it could freeze up, and not flow throughout system. If too strong it won't efficiently transfer heat, and will jell at cold temp, again limiting flow.

Posted on Jan 01, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

After changing the pcm in my 1998 sunfire it will not start. I am following the steps to relearn the pass code and it says after approximately 10 minutes the theft light will go out and try again. The...


Try removing the ground lead from the battery for at least a minute then reconnect; some of the onboard computer stuff is rebooted this way. If that fails check service manual for your VIN #

Jul 30, 2014 | 1998 Pontiac Sunfire

1 Answer

1998 pontiac sunfire will start and run for 5 minutes then dies


Sounds like a problem with crank, cam or the knock sensor.

Jun 21, 2012 | 1998 Pontiac Sunfire

1 Answer

How to rekey a pontiac sunfire 2004


Im assuming you are refering to the anti theft security key relearn process.

1. Perform a security system relearn.
2. Let the vehicle sit for more than 10 minutes with the key off.
3. Attempt to start the engine, leave the key in the run position monitoring the security system indicator.
4. After 10 minutes, the security indicator will change state.
5. Turn the key off and wait 10 seconds.
6. Attempt to start the engine. If the engine stalls, wait another 10 minutes with the key on.
7. After the second 10 minute timer has expired, turn the key off for 10 seconds.
8. Attempt to start the engine. If the engine stalls, wait another 10 minutes with the key on.
9. After the 3rd 10 minute timer has expired, shut the key off for 10 seconds.
10. The security system will relearn on the 4th starting attempt and the engine should start and run.

If that doesnt work, look into this link http://vatspasslockpasskeysecurityhelp.yolasite.com/

Aug 07, 2011 | 2004 Pontiac Sunfire

1 Answer

Anti theft code P1629


try leaving the key on for 5 to 10 minutes
for the BCM (body control module) to relearn

Jun 30, 2009 | 1998 Pontiac Sunfire

Not finding what you are looking for?
1999 Pontiac Sunfire Logo

783 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

60769 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

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

Answer questions

Manuals & User Guides

Loading...