Hi there,

i'm a new memeber of this board and live in Europe.
i'm reading the board for at least a year.

i've got a strange problem.

when my engine is warmed up completely and my thermostat is open there appears a problem.
when i let the rpm's revs my upper radiatorhose is going sucked vacuum.
when i revs 10 times or so the hose stays normal.
what is this?
the people overhere doesn't know what to do with this flat tophose.

i hope you guys can help me.
thanks Tom

possibly a combination of a weak upper hose and a thermostat not opening far ehough


I would replace the upper hose and install a high flow thermostat