Have a newish (2 yrs. old) Behr radiator. Drain plug is red knurled knob that faces forward. Does this knob come all the way OUT, or does it simply loosen so as to allow the coolant to drain. It met with some resistance and I didn't want to force it.

Thanks,

Coolant Change Newb

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

The plugs have hooks on them that keep them from falling into your drain pan. They can come all of the way out but they don't have to for all of the fluid to come out.

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1985 300D (CA, 173K)

Dynamite Biodiesel Co-op, Phoenix,AZ

So I'm guessing that, if I want to flush out debris from the radiator, my best best bet would be to disconnect the lower radiator hose?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

On a w124 they don't unscrew all the way out, it's a valve.

Do a search on my w123 radiator flush, I removed the top hose and flushed through that out of the radiator drain , and then I removed the drain block plug and flushed through there.

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1985 300D (CA, 173K)

Dynamite Biodiesel Co-op, Phoenix,AZ

The drain valve is below the lower hose fitting in case you want to drain that last teaspoon.

Sixto
87 300D