Coolant System Going Into Vacuum With Pressure Tester Installed

[GrnLantern]

Ive been having so overheating issues with my motor, so I hooked up a coolant pressure tester to it. I pumped it up and noticed the pressure falling, and with the car running when ever the engine is revved the pressure tester shows that its going into vacuum. Does anyone know what this means?

 

[Bullitt95]

Your lower radiator hose could be collapsing when you rev the engine up, restricting the inflow to the water pump and reducing its output.

 

[RangerJoe]

Sounds to me like its sucking coolant somewhere. Are you using or loosing coolant? Could be blown head gasket maybe?

Joe

 

[GrnLantern]

The lower radiator hose doesn't seem to be collapsing, Ive been leaning toward the head gasket but I thought the pressure would spike if it was a head gasket.

 

[91TwighlightGT]

It should drop down if there is a leak, even if into the combustion chamber.