I purchased a 1981 240d (manual transmission) a few months ago and I can't seem to find where the factory block heater is

I own an 85 300 turbo(California car) and tried to follow the cord on that one to try and where it plugged into the block but there is so much in the way I can't see it. Does anyone have a pic that they can post that shows where it's located? Also the 240 has manual heater controls, is that normal for these cars?