Question about 2003 Pontiac Montana

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Low coolant temp light

I have a 2003 pontiac montana and the low coolant temp light began to come on i then added coolant thinking it was low and a couple of days later it happened again i check the coolant and it was bone dry so i added more i also noticed a wet spot on the drivers side floor, so i began adding coolant everyday i am thinking it is the water pump but maybe i am wrong i removed the radiator cap and it back flowed into the coolant tank and began making a knocking noise please help before i waste money on something i dont need when i tried to open the radiator cap i ahve not had the light come on in like a day but i know there is a problem i need to know what it is so i can have it fixed.

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  • 18 Answers

STOP DRIVING!!!!.... if you have no coolant in the system you can ruin your engine.... if there is coolant inside the cabin then it is your heater core that is leaking.... it is difficult ot change on some vehicles becuase it is in the dash but still possible for the backyard mechanic.... you should be able to find one for about $100 but there is alot of labour involved...

Posted on Jun 18, 2009

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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.

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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!

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overheating is most likely a bad thermostat, but the coolant loss is a second big concern. Does the exhaust look like steam? You could have a cracked block and the coolant is leaking into the engine. Also check the oil for contamination.

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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,

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it could be your thermostate . i do dont think its your intake.as far as putting the cap on to tight.. they are sopuse to be tight so you did not hert it . have a nice day

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1 Answer

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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

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