Question about 1999 Pontiac Montana

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What is proper method for flushing the radiator and engine in a 1999 Pontiac Montana?

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1: Drain coolant system
2: Purchase coolant flush, making sure you have the proper amount for your size of coolant system
3: Pour coolant flush into your radiator, filling the rest with water
4: On the coolant flush bottle it will tell you how long to run your vehicle
5: Once done running, let cool enough to open radiator cap, and drain system COMPLETELY by first draining out of pep **** on radiator, then taking one side of the hoses off the radiator and draining those
6: Put hoses back on and fill system with coolant. When the fluid gets to the top of the fill port on radiator, start vehicle and let run, allowing air to escape the system, and fill as necessary

Posted on Oct 27, 2012

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6ya6ya
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Posted on Jan 02, 2017

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stormbrewin
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SOURCE: How can I flush my whole coolant system

Preferable to flush as much out as possible to get rid of the old stuff and can be done at home by undoing the heater hose at the fire wall and using the garden hose to force water through until it comes out clean Dont turn hose on full blast as it will spray out over everything build up to it so it doesnt make a mess.Make sure the heater is in the on position so that water comes out the pipe you took the hose off.Either way though it will still be ok to just undo the bottom radiator hose as the majority of it will come out.

Posted on Nov 20, 2008

Molson02536
  • 3854 Answers

SOURCE: can not find drain for radiator, 2003 montana

Drain plug is at the lower left side of the radiator.

Posted on Apr 05, 2009

hunterd777
  • 14 Answers

SOURCE: 1999 pontiac montana doors will not unlock with

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

Posted on Apr 22, 2009

  • 179 Answers

SOURCE: coolant sensor

According to mitchell on demand there is no low coolant tep sensor, only standard ECT sensor.

Posted on Mar 28, 2009

  • 98 Answers

SOURCE: My 1999 pontiac montana rear sliding power door will not work

I went to bulldogsecurity.com and looked up the wiring diagram for this vehcle. However, prior to checking this part, I would check to see if you have a blown fuse. It doesn't hurt and only takes a few minutes. There should be a fuse for that either somewhere on the side of the dash or near the brake pedal area. If not it may be under the hood, but it should be inside the vehicle. You may have multiple fuse boxes. If it has (2) sliding doors it will have a wire for the auto doors in each kick panel (under the plastic trim/molding) when you open the door and look down you will see all of the trim/molding it should snap out or may be held in place with a screw or (2). Once you remove that you should see the wires. It says for the left side it is either light blue or black and the right side is definitely light blue. Trace this wire until you find out where it ends (the motor or switch to control the auto doors) Then test the switch/motor to see if it is bad.

Posted on Mar 02, 2009

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1 Answer

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1 Answer

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2 Answers

2000 Pontaic Montana


I have a 2000 montana and mine was doing the same thing. I replaced intake manifold gaskets, thremostat, and water pump. Turns out it my heads were warped. I had them taken to a machine shop and it has seemed to fix my overheating problems.

Oct 21, 2008 | 1999 Pontiac Montana

1 Answer

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

Oct 19, 2008 | 1999 Pontiac Montana

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