Great point - I'll pick up a new cap. Should of thought of that one already.

BTW, does anyone know the part #s for (87 300D 603):

1) the 20cm/8.5" L shaped hose from the solenoid valve (by the battery) to the metal pipe that runs under the expansion tank and into the engine compartment [it's not very clear but it looks to have 124 832 53 94 printed on it - confirmed valid part #] and,

2) from the other end of the same metal pipe (by the turbo), the 25cm/10" U shaped hose from the pipe to the block [looks to have 124 832 54 94 embossed on it - confirmed to have been superseded by 124 832 81 94].

Absolutely correct on the pressure tank (got lazy in my description) but I didn't know that there was a real overflow...I thought it just spilled out back there. It's probably full of putrid goo. I'd better clean that out.

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Chris_87_300D
1987 300D - 415,000+ miles
1999 E320 - 220,000+ miles
2008 SL55
2019 Sprinter Diesel 4x4