As I've read up on the proper procedure for changing coolant (it's certainly clear according to the FSM that both the radiator and the block should be drained), I've been interested in two things:

1. The widely varying degrees of difficulty people have in freeing up the block drain....in the experience of some it's easy, for others it's been a nightmare. I must admit, the latter cases make me a bit reluctant to do it myself.

2. The inconsistency of professional mechanics (both indies and MB techs) as to whether or not they drain the block.

So I wonder: if you walked into your and and simply said, "Replace the coolant," would they drain the block? If not, why not? Laziness? Ignorance? Don't think it matters for some reason?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 75k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife