Unfortunately...
The mono valve repair kit J.H. mentions isn't available for the '90 M103 engine, you'd have to replace the whole valve. I think it's a pretty straightforward job to replace because it's very accessible ... although I'm pretty sure you'd have to drain your coolant system.
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-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi
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