R34 Water Pump

[RB25DETC33]

So my R34 has started to over heat. pulled out the radiator and cleaned out all the muck around the fins, flushed the coolant and topped it up.

Drove for 30 mins and the car started to get hot again. I have a feeling the water pump is gone because the car comes up to operating temp REAL fast, Ive read that the thermostats are supposed to open gradually as the temp increases and slows the rate of increase to a gradual rate.

Now Ive driven the car today only to work and back, 5 mins drive home and the car was at operating temp not higher. Im not sure if this is the way to check if your pump is working but I removed the radiator car and then started the car, instantly the coolant rose up and started leaking out of the top, i blew some of it out to lower the height, I check to see if there was a flow of water but there seems to be nothing?

If there are any other ways to check can you please help?

If it is the pump ill order one this week and spend the weekend pulling the front of the car apart.

[niZmO_Man]

Did you test or replace the thermostat?

[RB25DETC33]

not yet, ill pull it out tomorrow and test in in some water.

[RB25DETC33]

So looks like it was the thermostat, pulled it out and it did not open in boiling water. so until the new thermostat arrives Ive wedged it open about 50% so as to have some flow, need the car for work and travel to uni, will be keeping a very close eye until the thermostat arrives. Started the car and there is a flow of water through the top tank.