I'm assuming you have already double checked your car does not have a block heater? Sometimes they are installed but the cord is missing. Then it is just a simple matter of installing a cord.

Also, I'm assuming this is an OEM block heater that will fit in the plug?

If you were sure you didn't have one and hadn't purchased one I would advise you to buy a radiator hose heater. I've never installed one into the block but from what I've read, it seems it can be a bit tedious.

I don't think there is much to it, but just has limited space. You will probably want to remove the air filter housing and perhaps other things to get as much access as possible. Use a long breaker bar maybe even extend the bar with a length of long pipe and use heat if needed.

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD