From digest.v5.n480 Thu Oct 31 00:24:41 1996
From: Bob Stommel <Bob_at_trader.com>
Date: Wed, 30 Oct 1996 16:57:07 -0500
Subject: <E30 M3> Coolant loss

>My 89 m3 is mysteriously loosing coolant. No puddles infer the car, water
>pump was done about 12k miles ago, no coolant inside the car. I'm thinking
>that the head gasket is going. Is this a common problem? Will a compression
>check indicate the leak?

Try replacing the coolant recovery tank cap. Another E30 M3 pilot had this same problem at a driver school this past spring and it turned out to be a worn out recovery tank cap. BTW, the replacement OEM metal caps for the E30 recovery tanks have been "upgraded" from the original version.

Hope this helps.

Bob Stommel