Question about 1999 Pontiac Montana

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Low coolant light comes on

I have a 00 pontiac montana, the low coolant light comes on and will not go off, the van is not overheating. im not sure if it is the thermo or a sensor.

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  • kuntreeboy08 Nov 12, 2008

    which sensor and where at

  • RickandPatty Beckett Oct 05, 2013

    on the side of the radiator passenger side top

  • Anonymous Mar 30, 2014

    overheats when im not moving the faster i go the temp drops

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  • 160 Answers

If the van is not overheating and the coolant is full than your sensor is bad

Posted on Nov 12, 2008

  • james lee Nov 12, 2008

    coolant sensor usually mounted in coolant tank

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1 Answer

While driving down the road in my 2003 pontiac montana. The change oil light comes on and high temp warning light comes on. When the high temp light comes on the van losses all power.


Check the coolant first. Add as needed. Once full. heat it up in the driveway and check for leaks. 3.4 montana, I would guess the water pump. Change the T stat also.

Aug 09, 2015 | Pontiac Cars & Trucks

1 Answer

While sitting at a drive through or at a red light my van will run hot and the hot coolant light comes on.


sounds like thermostat is sticking or cooling fan or or fan sensor is bad....but first have you checked the coolant level,,could be low....hope this helps and good luck.

Aug 18, 2012 | 2000 Pontiac Montana

2 Answers

I have a 200 Pontiac Montana and today it overheated into the red! Not sure why! I also don't have heat unless the RPMs are above 200. My fan don't kick on unless the air is on. 2 months ago I...


With the car running because it reduces the back pressure have someone that knows how to do it remove the cap from the radiator and see if the radiator is full, not the bottle but the radiator itself. If the antifreeze is not moving from the bottle to the radiator it will overheat. Not having heat unless you rev the engine makes me think the radiator is either not circulating the water or it is low.

Apr 24, 2017 | 2000 Pontiac Montana

1 Answer

Hi carl i had pontiac montana m1999 overheating after i travel like 40 km n all the coolant going back to the reservoir


Hello, if you've changed the pump. cap. and t-stat and its overheating still i need to say that just because you replaced those parts doesnt necissarily mean they work. Im mainly talking about the t-stat and cap. was this your first time installing a tstat? They go in a certain way. Make sure you put it in the right direction. Your vehicles engine might require you to purge your coolant system of all air. On some cars air will remain trapped in the area right at the tstat causing it not to work therefore not opening up and no t circulating the coolant. I would start there myself. If thats not the case, next id flush the radiator. I would like to know what the problem symptoms were wich led yoy to replace those parts please.

Dec 07, 2011 | 1999 Pontiac Montana

1 Answer

2001 Pontiac Montana. Van overheats (redlines) occasionally, which results in loss of heat (very cold air). When this happens lights flicker, like something is turned on??? After this their is a loss of...


Where do you hear a valve or flapper moving??? Behind the dash ( instrument panel ) It sounds to like you have a electrical problem , not overheating problem . You need to test to see what the real engine temp. is . Also have vehicle checked for DTC'S - diagnostic trouble codes ,Sounds like A/C is kicking on , the flaper noise you hear is probably the temp actuator inside the dash . You can buy the tool in the video at harbor freight cheap. Point it at upper radiator hose ,near the engine . The IPC illuminates the hot coolant temperature indicator in the message center when the IPC determines that the coolant temperature is greater than 128°C (262°F). The IPC receives a class 2 message from the PCM indicating the coolant temperature. Are you getting any such message ?
How to Use an Infrared Thermometer to Diagnose Car Problems

May 07, 2017 | 2001 Pontiac Montana

1 Answer

Blowing cold air no heat


make sure coolant is in radiator....if its full, thermostat may need to be changed.....if thats not it check heater coil

Jan 03, 2010 | 2004 Pontiac Montana

1 Answer

It is 5 below zero here in Minnesota, I went out to start my 2000 Pontiac Montana van and after about 15 min. she overheated as well as no heat in the van. suggestions?


Sounds like maybe the coolant is low or out. thats the first thing to check. If the coolant was full, then the heater would be roasting hot.

Dec 15, 2009 | 2000 Pontiac Montana

1 Answer

We have a 1999 Pontiac Montana with an unknown trouble code.


P1483=engine cooling system performance
Are you adding coolant each time this light comes on in the coolant reservoir?
if so,you need to find where it is leaking out,

Nov 21, 2009 | 1999 Pontiac Montana

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