chuck <chuck@localhost.localdomain> wrote in
news:slrndlcato.6ma.chuck@localhost.localdomain:

>
> My 91 Civic presurrizes the cooling system upon startup. The overflow
> tank is also under pressure and there is a slight leak under the cap.
> There was also a spare cap under the hood when I bought the thing not
> long ago. Is this pressure normal or is the head gasket going? There is
> no oil in coolant, no coolant in the oil, and it doesn't smoke. It runs
> good and doesn't overheat. But if you start it with the cap off it
> sprays coolant. Should the overflow tank be vented? I only see one hose.
> THanks in advance.



Something is seriously wrong here. Are you saying the expansion tank has a
pressure cap on it?

On your car there should be an 0.9-bar cap (13lb) on the radiator. This cap
should allow pressure to bleed off into a tube in the rad filler nack that
goes to a non-pressurized expansion tank.

Is the rad cap aftermarket or OEM?

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TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/