pretty bad
Typical Repair Cost:
Average Mileage:
111,200 miles
Total Complaints:
7 complaints

Most Common Solutions:

  1. not sure (5 reports)
  2. rebuild cylinder head & replace head gaskets (2 reports)
2002 Pontiac Montana cooling system problems

cooling system problem

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2002 Pontiac Montana Owner Comments

problem #7

Jul 012013

Montana Ext 3.4L V6

  • Automatic transmission
  • 113,711 miles


Van overheats intermittently and rises quite high (based on the dashboard gauge). New radiator, thermostat and temperature sensor but continues to happen. Fan relay was checked and seemed fine, fans come on late and were not consistently running both stages. Temperature seems to be more steady with air conditioning on.

- Troy H., Surrey, BC, canada

problem #6

Dec 012012


  • Automatic transmission
  • 80,778 miles

had the thermostat changed out.......water pump changed out...... the rad flushed then later changed right out replaced new...... the aternator changed out...... a few hoses changed out....what else can i try? please help.....is there any change if i get the auxerilly hoses cleaned out oh and we got a new ah i forget but going to have to replace everything new soon to figure this out

- Diane C., Thunder Bay, Ontario, canada

problem #5

Aug 132009


  • 101,929 miles

I have the exact problem with my Montana and am pissed, they should ,,recall and fix them cause it is expensive and I need my van for work and kid... the damn coolant leaks and I never seen it before on the dry pavement so never bothered much ,I was low and kept adding more as it went lower or over heated got it looked at and . it is the intake gasket and is a lot to fix the problem $$$$ am pissed off because I heard if it is not done right away it can go through the oil or motor or something like that and am scared now ,,I hope it didn't already do that so now I am @!#% needless to say I got an appointment to pay a sh*t load of money but hopefully it will be fixed for good before snow comes,,, Thanks ..<()><

- Erron C., Ssm, ON, Canada

problem #4

Sep 272010

Montana 3.4L

  • Automatic transmission
  • 128,624 miles


Had oil changed and fluids topped up 1 month ago. This week red thermometer light came on suddenly and car quit on highway. Had towed. Gaskets replaced after same problem 18 months ago--cost 1600. This mechanic not sure if first mechanics (out of province) actually replaced head gasket as it was "severly warped". Bolts cracked. Mechanic said this is an ongoing problem with this engine. Bought from Burlington Auto Park in 2004 but they never mentioned this.

- delia60, Georgetown, Ontario, Canada

problem #3

May 242010

Montana EXT 3.4L V6

  • Automatic transmission
  • 88,235 miles

Pontiac Montana, 2002, has an overheating problem. During hot weather, at low RPM, then temperature climbs until it redlines. When it redlines, the display shows the RED temperature warning. I pull the van over, open the hood. The engine doesn't seem that hot. I open the coolant reservoir, not that hot to touch, plenty of liquid.

It should be mentioned, I was blowing cool air (not A/C - not working right now). I was told by someone to switch the temperature to HOT (I know, during hot weather) on full blast to help cool down the engine. It seemed to work and the temperature now went to about halfway up the gauge going forward. But we've noticed the heating issue is intermittent.

Any ideas?

- Jeff S., Toronto, Ontario, Canada

problem #2

Apr 052010

Montana V6

  • Automatic transmission
  • 145,000 miles

We replaced the thermostat thinking it was sticking shut and opening finally off and on to where the temp was overheating to where the warning temp light came on at 260 then it will suddenly start kicking heat out bringing the engine temp back down.No leaks appear to be happening of coolant and just a frustrating problem.

- Jason K., Muskegon, MI, US

problem #1

Feb 192009

Montana 3.0L V6

  • Automatic transmission
  • 120,000 miles

first off i think dex-cool is overrated. it does nothing but leave sludge(gel) in your radiator.secondly the engine is so backwards noone wants to work on them.thirdly ive tried different mechanics and they cant seem to find the problem. im also having electrical problems, the brake lights keep going out. ive been pulled over constantly by police.

- Keith T., Waynesboro, PA, US

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