Question about 2002 Pontiac Montana

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2002 pontiac montana overheats but rad is cool.Thermostat has been replaced and still overheats in less than 10 km. Rad over flows and pressure fills the overflow. Coolant is warm. Possible water pump problem??? Faulty new thermostat???

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Either you have not bled the system, or possible fan not working, or head gasket problem. Solution

Step by Step
1. Check both hoses, do both have equal amount of pressure?
2. Run the vehicle where your gauge shows in the middle, shut the vehicle off then open the bleed valve near the heater line and wait till fluid comes out like a steady stream. Make sure you do not go low on coolant.
3. Turn on vehicle, turn on A/C high maximum blow check to make sure both fans are on. We are testing to make sure the fans at least work!.
4. After all this and you are still boiling over make sure your radiator cap is good if not then replace. Last but not least get a block tester to test for exhaust gases in the coolant. Rent one from autozone. $25.00 plus fluid which is about $8.00.

Posted on Sep 15, 2010

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Sounds like you have a bad head gasket, you'll have to take your vehicle to the dealer to be sure.

Posted on Sep 15, 2010

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First thing I'd do is replace the thermostat, they're usually in the rad cap, but check the owners manual to be sure. I'd also do a rad flush in case there's problem with the coolant itself. While you're under the hood, check to see if any belts are loose, or if any hoses seem to be leaking. You could also try a bottle of rad flushing fluid - $10 - $20, because there may be a blockage somewhere in the cooling system. Hope that helps, best I can suggest without seeing it in person.

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Possible trapped in system. Bleed system, should have two small screw bleeders, one in front of left valve cover on pipe behind water pump and the other on coolant pipe outlet as you follow upper rad. hose towards engine. Engine cool, remove rad cap, open both bleed screws and fill rad until coolant flows free out both bleed ports. close both bleed screws, rad cap off, start engine and let idle until upper hose is hot to touch , shut off, let it cool down for 20 minutes, top up rad and install cap. restart car ,drive and check.

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There is an air bleed on the top of the water pump outlet and another on the thermostat housing/upper rad hose neck. With the rad cap open and these screws loose, fill the cooling system until water comes out, then close the screws. Do not over tighten them.


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Iv just had my head pressure tested and skimined put new headgsasket on. now it overheats in 5mins poorsout. my car is a citrioen synergie.


its sounds like an air lock in your cooling sys. when its cold fill the rad then start the engine turn on the heat (with rad cap off) top it up when it burps put your rad cap on and let it warm up

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Putting in coolant


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1994 Honda Civic LX\overheating within 2 mile drive


Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
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