Asked by Jan 20, 2015 at 06:53 AM about the 2000 Pontiac Montana Base

Question type: Maintenance & Repair

van is overheating and losing heat. heres the list of parts replaced; head gaskets, radiator,
water pump, thermostat, some hosing and clamps.
Am i missing something here, could it be a sensor.

6 Answers


Make sure to bleed the air out of the cooling system. Sounds like that's what's going on. HTH. -Jim

3 out of 3 people think this is helpful.

any explanation on how to do this, Jim ?

1 out of 1 people think this is helpful.

There's a couple ways. First is by using the bleeder screws on the engine. I believe your engine has 2. One on the thermostat housing and one on the thermostat bypass tube. Open them and fill the radiator. Continue adding coolant until a steady stream of coolant comes out of the bleeder screws. Then close the bleeder screws. Make sure the radiator is filled to the tip top, when cold, and replace the radiator cap. Fill the plastic recovery tank about half way with coolant as well. There's also a tool that you can buy to pull the air out of the cooling system. Most auto parts stores have them or you can buy one online. For that just follow the directions that comes with the tool and you should be all set. HTH. -Jim

1 out of 1 people think this is helpful.

tried that and the same thing is going on. what else can i do to resolve this problem.


I even took it for a test drive, and the heat would be hot and the temp gauge would stay down, then it went to cold air and the van started to get hot and the gauge went up to the red. i am confused about it all.


The 3.4L V6 engine is notorious for blowing head gaskets. Pressure test the cooling system. Pressurize the system and start the engine. If the needle on the tester's gauge bounces the head gasket is blown. Also look for white milky "goop" on the oil dipstick and under the oil filler cap. I realize that you just had the head gaskets done but perhaps the shop didn't do it correctly. Your symptoms are exactly the same as a guy at work. Just before Christmas he was having the same exact issues with his '05 Buick. It turned out to be the head gasket. He's now driving a '15 Toyota. Pressure test the cooling system before we condemn it. HTH. -Jim

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