On 2005-10-19, E Meyer <epmeyer50@msn.com> wrote:
> On 10/19/05 6:24 AM, in article slrndlcato.6ma.chuck@localhost.localdomain,
> "chuck" <chuck@localhost.localdomain> wrote:
>
>>
>> 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.
>
> Look carefully at the tank itself, there should be some sort of overflow
> tube built into it. I've never encountered a Honda with a pressurized
> overflow tank. My guess is that your radiator cap is bad and the overflow
> hole on the overflow bottle is plugged.
>

I see no overflow tube. I pulled the tank off (it just slides into a
groove built on the motor mount) and there's no vent tube. The cap to
the overflow tank screws onto the tank and I can see no sign of
tampering. I'll get a raditator cap and see what happens. BTW, the cap
that's leaking is the radiator cap. Sorry I wasn't clear about that.