what would cause coolant not to come out motor into upper radiator hose

Asked by Apr 23, 2016 at 10:08 AM about the 1990 Pontiac Grand Prix 4 Dr LE Sedan

Question type: Maintenance & Repair

3 Answers

Just put new water pump on

209,955

The car needs to be running to get it up to temperature first, then the thermostat can open and the coolant can flow through the upper hose into the radiator.

3,495

And if the engine is already running which I'm guessing it is, that's a sign of air trapped in the system. There's a bleeder valve near the thermostat that is used to let out the air. I've also read that it helps to have the car parked facing uphill while filling and bleeding the system. Getting the air out does seem to be a bit tricky on these engines, but its imperative that you do or you will overheat and damage other things.

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