Just a guess...I would look at how the heater is blocked off. If the return flow from the cylinder head to the water pump is blocked, it could cause a problem.
Regards,
Randy D.
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W.R.Durrance
ASE Master Tech
Mercedes Tech 20 Years
68 250SE
68 SAAB 96 Ice Racer
69 300SEL 6.3
70 300SEL 3.5
81 300TDT
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