Question about 2000 Pontiac Montana

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Overheating even with radiator full of water - 2000 Pontiac Montana

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Hi the main reason an engine will over heat is if the thermostat is stuck in closed position if this is the case then this will need replacing then you need to check if it is still over heating.

another cause could be a faulty water pump but i would go with the thermostat first as this is the most common cause.

now their is a slight chance the head gasket has gone so bare this in mind

also when you fill it back up with coolant make sure you have the bleed screws open in the top hoses running around the engine ( if you have them if not then some are self bleeding) then you need to trickle the coolant back in very slow to prevent their being an air lock as this will cause it to over heat.

what i would do next is take the thermostat out and have a look at it in its closed position then pour some boiling water into a tub then place the thermostat in the tub leave it in the water about 4 min then take it out using something so you dont burn your hands then have a look at the middle part and check if it has opened to allow water to run through it, it it dont open then it needs replacing.

if it does open then you need to start thinking about water pump or head gasket.

check for signs of leaks as this will cause over heating.

let me know how you get on and tell me what you find then ill do my best to assist you further.

plz rate this solution as i have loads of unrated posts that are filling my screen up, thanks

Posted on Aug 25, 2010

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