I am calling the top tank on the rad the expansion tank and weeping is the wrong word.. I meant that eventually filling thru the top hose raised the level in the rad till it began to run out the top hose neck on the rad since it is open while I pour the coolant into the unconnected hose.
I had the cap on loosely and the heat full on while I was running the engine.

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1981 240D 143k 4 spd manual -SOLD

2004 VW Jetta TDI 5 speed 300k -still driven daily