First off, the tank under the license plate is not the expansion tank,
but the overflow tank. It has three vent holes in at the top on the side
where the license plate is.

The other tank, with the coolant level sensor is the expansion tank.

Is the expansion tank full as well?? Or does it have a big bubble in the
top?? If after warming up, there is a big bubble in the top but the
overflow tank is full, then you most likely have combustion gases
blowing out into the coolant system from the engine. Bad news!!

The very best way to know for certain is to take it to a well equiped
garage and have them do a sniff test. They will be able to detect
hydrocarbons from fuel in the coolant.

Good Luck!

John Rodgers
88 GL Driver
88 Volksiebus

Marty Kulmus wrote:

>Last Saturday I saw the drip drip of antifreeze under the back of my 87
>Westy. Of course I thought "Heads". It wasn't. I looked under the license
>plate and saw that the expansion tank was completely full. As in over the
>top of the cap full. What's up? Right off the top of my head I think that
>some compression gas is getting into the cooling system. Any input will be
>appreciated. Thanks.
>
>Marty
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