what would cause the coolant to come out the overflow tube all the time

Asked by May 10, 2016 at 03:25 PM about the 2000 Pontiac Grand Am SE

Question type: Maintenance & Repair

we fill up the tank and it starts to get warm and it starts coming out the
overflow tube.and we've changed the thermastat and waterpump and the cap.

3 Answers

101,475

you could have a bad radiator cap, but I'm thinking that you may have air in the system that needs to be bleed out. https://www.youtube.com/watch?v=zUpXgAJ1gjU

3 out of 3 people think this is helpful.
315

Are you filling the coolent reservoir past the max fill line?

30

still sounds like the cap and just because its new dont mean its good. and like Joemom said check the bleeder screw at the thermastat housing have it open eng running and filling the rad. as soon as coolant comes out steady shut the screw top off the rad. install the cap and shut off the motor.

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