Help with overheating

Following my previous thread regarding the overheating of my P38.

I am still none the wiser.

Right, I have had the air con fans wired up so they can be operated manually from a switch inside the cabin. There is also an inline electrical sensor fitted to the top water hose on the right hand side of the rad as you look at the front of the engine. If the water heats up to 87 degrees as it passes the sensor the air con fans kick in.

I can't remember if the air con were working automatically at the time of overheating, i think i used the manual switch. (good call having that fitted.)

I've tested the thermostat three times (you know putting it in boiling water) it worked each time.

I took off the small hose (the one that feeds the header tank) at the radiator and the water flow was only about two to three inches. I think it should have more pressure than that.

Now the thermostat is out is there a way of testing the water pump?

Once again....

Thanks guys.

Take the pump out and inspect it. That waterflow, if I understand what you are saying, sounds normal to me