I have never changed my own coolant....but have faithfully had it changed by my tech every couple of years so I'm confident the system is pretty clean. But, this seems like something I should be able to do myself. I've read various threads, but I'm still unclear on a couple of things.

This is for a 1991 and 1992 300D.

1. Of the total system capacity, approximately how much comes out if I ONLY drain the radiator? How much comes out if I drain BOTH the radiator and the block? I ask this because I might opt not to mess with the block drain and simply drain the radiator a bit more frequently. But maybe this is a bad idea?

2. Once the radiator is drained and the plug screwed back in, do I fill it by disconnecting the upper radiator hose and finding some sort of L-shaped or bendable funnel to pour coolant in? I'm assuming I don't add by filling the expansion tank.

3. If I take this simplified approach (i.e. only draining the radiator), is it simply a matter of draining, filling, starting the engine, then burping with expansion cap off? Anything else I need to watch out for, attend to?

Thanks for helping me out as I slowly but surely add to the number of things I'm able to do on my own!

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife