Question about 1999 Pontiac Montana

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How do i know if its my thermostat going bad on my pontiac montana 1999

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  • Pontiac Master
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If you have a temp gage, it will read higher when car is warmed up. If you have a warning light, it would come on more often. Usually they fail suddenly and the car overheats. If you want to know more, please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Oct 01, 2010

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Posted on Jan 02, 2017

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SOURCE: Pontiac Montana '99 Water Thermostat removal

Yes, it can be removed and run without the thermostat. However, your gas mileage will suffer and the heater may not work very well.

Posted on Apr 29, 2009

mcdevito75
  • 1970 Answers

SOURCE: 1999 Pontiac Montana

mcdevito75 here, Thanks for the info.

Posted on Jun 22, 2010

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1 Answer

My 99 Pontiac Montana Keeps running Hot.I replace the thermostat , Coolant Sensor..Is It possible that the water pump Is Bad?


The radiator may be plugged or the head gasket can let compression gasses into the radiator . To check, run the engine without the radiator cap and look in to see if there any bubbles in the coolant. If there is a lot of coolant moving in the radiator after the T/stat has opened, the water pump is ok. If not then suspect the water pump is not circulating enough water.

Nov 09, 2016 | 1999 Pontiac Montana

4 Answers

99 pontiac montana overheaten already changed thermostat what is it?


you have a GM common problem and that is a bad intake manifold gasket. GM change the gaskets to plastic and they crank and leak causing over heating. here is a picture of one i took from a 2005 pon. bonneville with 74,000 miles on it2_12_2013_3_00_09_am.jpg

Feb 12, 2013 | 1999 Pontiac Montana

1 Answer

Overheating, replaced watrpump, thermostat, heater core.


Hello, randtshook40 and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your
1999 Pontiac Montana, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating
1999 Pontiac Montana

Get more great money saving tips and tricks about your vehicle from: twitter.com/acoates23234

Thanks for the vote, and good luck!

Dec 25, 2010 | 1999 Pontiac Montana

2 Answers

What kind of transmission fluid goes in a 1999 pontiac montana


Recommended GM DEXRON® VI, Low viscosity transmission fluid.
Note: make sure you don't over fill transmission and the Montana's transmission are know for failures due to high fluid retention caused by high viscosity transmission fluid from additives or dirty transmission oil and filter.
Thank you for using Fixya and good luck.

Mar 20, 2010 | 1999 Pontiac Montana

2 Answers

Pontiac Montana overheating


How do you know the thermostat is ok? If in doubt replace it. Water pumps are a even bigger what if. Did he do a radiator flush? Cooling system flush of the engine? Cooling fans come on at what temp and go off when? Replace the engine temperature sensor? 6 years old is bound to have sensors and such go bad.

Jun 16, 2009 | 2001 Pontiac Montana

1 Answer

Pontiac Montana '99 Water Thermostat removal


Yes, it can be removed and run without the thermostat. However, your gas mileage will suffer and the heater may not work very well.

Apr 29, 2009 | 1999 Pontiac Montana

1 Answer

1999 pontiac montana doors will not unlock with


your door lock actuators are bad.there electronic and are right costly

Apr 22, 2009 | 1999 Pontiac Montana

1 Answer

Need to replace thermostat on pontiac montana van.


public library...Chilton or Haynes auto repair manuals or collisionrepairadvice.com     make sure you bleed the system

Mar 30, 2009 | 1999 Pontiac Montana

2 Answers

Over haeting


Had the same problem....turned out to be the water pump.

Jan 13, 2009 | 1999 Pontiac Montana

1 Answer

1999 Pontiac Montana


mcdevito75 here, Thanks for the info.

Jun 11, 2008 | 1999 Pontiac Montana

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