Pressure testing

Asked by Sep 06, 2017 at 09:34 AM about the 2002 Pontiac Montana

Question type: Maintenance & Repair

If I used a pressure tester and it held pressure for
more than 5 mins would you think I have a motor
problem? My 2002 pontiac Montana keeps running
hot but not all the way to the red. I've changed
thermostat sensor radiator water pump and
heating coil.

1 Answer

83,865

It should hold pressure for a minimum of 15 minutes. If so, I'd suspect that you have air trapped in the cooling system. Some of these GM cooling systems can be a real bugger to get all the air out. Park the vehicle on an incline with the front of the vehicle pointing upwards. Like halfway in the driveway. Eith the engine cold fill the radiator to the tip top and wait. The coolant will slowly go down and you may see air bubbles coming up to the top of the filler neck of the radiator. Continue topping off the radiator like this until the coolant stops going down. It may take a little while so be patient. When you're done, put the radiator cap back on and fill the plastic recovery tank to the full cold line. HTH. -Jim

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