Question about 1999 Pontiac Montana

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Heat & temp gauge

I have a 1999 Montana, currently I have no heat and my temp gauge will rise quickly then go right back down quickly. I have had my thermotstat changed, radiator flushed, and lines bleed. Nothing seems to have solved the problem, any information would be greatly appreciated.

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  • john henry carter
    john henry carter Oct 31, 2013

    et the garden hose and undo your heater hose and force water into the heater hose then reconnect your eater hose then top up ..ok

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  • Master
  • 341 Answers

You have bled air out of system. on top front right of eng. there is a brass bleder

Posted on Oct 21, 2008

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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

Temp gauge is rising at 3/4 of the way even while traveling down the interstate, once a/c was turned off it started to go back down but would still go up if sitting still running, what would cause this?


change the antifreeze and flush your system, its been hot lately so the motor heat goes up too, having the AC on makes the motor work harder, so thats normal that the temp would rise when its on. traveling on the road allows air to help cool the motor, sitting in traffic slows the air, so there again heat will increase

Jul 04, 2011 | 1996 Honda Accord

1 Answer

Temp gauge is rising but when i turn heat on it will lower somewhat. is my thermostat is sticking?


Your thermostat may be sticking. Turning on the heater will always help to lower the temp a little when you first do it. You can try removing the thermostat and see if that alleviates the problem. Off course if you live someplace where its cold, you may want to just go ahead and replace it. Good luck!

Mar 12, 2010 | 2003 Pontiac Montana

1 Answer

Temp gauge will rise quickly then instantly pin in red and oil light comes on. Continue driving, after couple of minutes it will go down. The rise quickly and do it again, sometimes causes overheat sensor...


If this truck is not overheating, then I would suspect the temperature sensor, if it is overheating then this must be repaired first. The sensor should be mounted in the intake manifold. Hope this helps, let me know

Jan 23, 2010 | 1999 Ford Expedition

1 Answer

Where is the temp gauge sending unit located in a 1999 pontiac montana


ALL temp gauge senders are on the engine mainly on the top of the retuen of the water to top hose or in the housing some were around that area and most are small brass senders with a 1 or2 wires going to it
but sometimes they are at the back of the engine but not hard to find
But dont get mixed up with OIL SWITCH as oil switch is lower in the block

Sep 17, 2009 | 1999 Pontiac Montana

1 Answer

Temp gauge and gas gauge not working


I had the same problem with my 2001 Pontiac Montana and the intake manifold gasket. This is a major problem with these 3.4L engines, if you are in the states I'm pretty sure there is a class action law suite against GM for this. I had my manifold gasket replaced and it was about $1000 CAD. You need to get your vehicle looked at right away as this could cause major engine damage, coolant will leak into the engine and soon enough you will be replacing that too. Good Luck

Jan 04, 2009 | 2001 Pontiac Montana

1 Answer

Temperature gauge shows hot


head gasket does the overflow bootle have bubbles in it when idleing warm if does most likey rear head gasket.

Jan 04, 2009 | 1999 Pontiac Montana

1 Answer

1999 Pontiac Montana Overheating


sounds like you could have faulty gauges to meby check them out.... and yes its posible that its pluged

Dec 06, 2008 | 1999 Pontiac Montana

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