Question about 2000 Pontiac Montana

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Coolant problems related to transmission?

2000 Pontiac Montana. Head gasket leaking coolant into oil. Overheated once. I filled coolant and risked driving a few miles to store vehicle at home for a later repair. The low coolant light came on and there was no heat from blowers. Engine temp stayed normal but battery light came on as the engine completely shut off and braking seemed less effective until car coasted to stop. Started again fine and all electrical working. Parked it in nearby lot to retrieve tomorrow. Planning on replacing the head gasket at home. The head gasket leak is a very recent problem and I am afraid that not catching it in time may have done damage to transmission. When diagnosing the coolant system, what could be doing damage to the transmission? Is AllData helpful with diagnosing mechanical problems as well as computer diagnosis.

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  • yoshi04 Apr 09, 2009

    Not really sure what caused it because it was really dark. But, the temp gauge and everything else was fine until I saw the battery light came on and the engine just shut off so my Montana coasted till stopped. Lucky enough that it happened right in front of my house. Waited a minute or two and the van just started fine. Would it be the same cause here?

  • Anonymous Mar 22, 2014

    head gasket

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Tran should be ok need to take head to repair shap and be sure head is ok and not cracked. thermostat, radiator, or cap, hoses need to be checked to dtermine what caused it to run hot also check engine fan. Pls rate this solution

Posted on Feb 17, 2009

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2000 Mazda MPV Engine overheating


Head gasket is bad / leaking.
adding fluid on a regular basis is the first clue.
The coolant is seeping into the combustion chamber via a bad head gasket... and running out the tailpipe.

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Coolant in oil ??????


Head gasket. If you have a V-6, have someone do a cylinder bleeddown test. It will save you from having to pull both heads. You only need to work on the bad one.

Oct 16, 2012 | 2000 Pontiac Montana

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Car is running hot, hasn't overheated yet, added coolant and it is still running hot


It could be the thermostat. But more than likely the head gaskets are starting to leak and it will only get worse. Don't wait too long to have it repaired because antifreeze leaking into the cylinder will stick the rings, especially the oil ring.

Nov 05, 2010 | 2001 Pontiac Montana

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I have a 2001 Montana with 84000 miles on it and just recently got an estimate for replacing the head gaskets for $1900-the van sputters initially after sitting for a period of time and then seems fine. ...


First check that this is true, Check your dipstick, if you see a "milkshake" then that is definately your problem. If you keep driving on it like this you will cause excess strain on the engine from it being over filled with fuilds. You will also reduce the ability of the oil to cool and lubricate the engine properly. It is possible you will ruin your engine. Also you run the risk of over heating your engine from the coolant leak, and will have to continually add coolant/water to the system.

Oct 26, 2010 | 2001 Pontiac Montana

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I have a Pontiac Montana (2000). That on my way to work the low coolant level light came on. and after work when I started it up the light did not come right away but it came on and there was no heat and...


No. It is not the thermostat. You are just low on coolant. The reason for the low coolant is either the fan is not working, the head gasket is blown, or the coolant system has a leak.
The fan is easy to check. When the temp comes up then the fan should come on.
The head gasket is easy to check also. Your oil will be milky white.
And if the radiator, radiator hose, or gasket leak can be harder to find.
The heater not working is because there is not enough water to heat the heater core.
PLEASE RATE. By checking Four thumbs ups!
Thanks! Have a GREAT DAY!

Oct 16, 2010 | 2000 Pontiac Montana

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Radiator fluid leaking, not from radiator or hoses going into engine block. Comes out from above transmission pan.


If the leak is back there? sounds like an intake gasket or head gasket if you ruled out the hoses

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I have a 2000 pontiac Montana. The problem is with the coolant


We have the same problem. It's an air pocket in the cooling system. The cause can be anywhere from not filling the system all the way or most likely a leak has developed and air has entered into the system as the coolnt level has dropped. The coolant light goes off and on as the air pocket moves around.

Our Montana has a leaky intake gasket, which is the source of the problem. A very common problem with the 3.4. It should go for another 100K plus though, once it is repaired.

Jan 26, 2010 | 2000 Pontiac Montana

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2003 ponitac montana... Not holding


need to perform a coolant pressure test. fill the reservoir and after the engine cools down fill the radiator, next start the engine and wait till the coolant system builds pressure then turn off the engine and using a mirror and flash light look for a leak.check water pump, hoses,radiator tanks for cracks,intake gasket at the corners espesically at the back next to the trans.also pull the carpet back and check for coolant leaking from the heater core,and last remove the sparkplugs and check for leaking head gaskets.hope this helped.

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I have a 2000 Pontiac Montana, I have antifreeze mixing with my oil, what could be causing this and how do i fix it?


hey okiebelgium,
Hate to break the bad new to you, but when you coolant is mixing with you oil it is almost a sure thing that you have a blown head gasket. Im guessing this pontiac has higher miles, usually that is when you see something like this happened. In most cases high gaskets start leaking from abuse or lack of maintenance, not that you did either, but maybe the owned before you was very rough with it.

The fix, this is a huge job something that, if you have never replaced a head gasket before can take weeks. If you take to a dealership it is going to cost big bucks and some independent shops wont even touch a job like that.

Let me know if you have anymore questions, thanks.

May 13, 2009 | 2000 Pontiac Montana

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