H3 got hot and sprayed coolant everywhere. Rented a pressure test and hooked up to radiator. It’s sending air to the expansion tank and coolant in there is bubbling. I’m not getting any pressure build up in system at all. What am I doing wrong?

 

Pinch pliers on the overflow hose.

 

Thanks I tried but didn’t work. It did give me an idea though. I removed the hose near the radiator cap and plugged the end of the connector. Worked like a charm. Pretty sure it’s the water pump.

 

Trace the leak under pressure.