I have an elusive coolant leak in my 1.6TD which only appears under very hot
conditions which I cannot reproduce on this little island... (none of the
hills are long enough!)

Last time we drove the Coqihalla, I lost a few inches in the fill tank, and
it was dripping from the head heater hose outlet area. I suspect the hose
either has a pinhole, or the head flange is leaking, but need to pressure
test. Can I hook up my compressor and feed 15psi into the pressure tank
using the overflow cap, or will this mess with the valve in there? (I'm
using a 2.1L WBX tank and cap).

Thanks

--
Shawn Wright