Originally Posted by BodhiBenz1987

OK guys, the snow is clearing from the garage roof and I'm ready to put the 300D back in it and get back to work. It's drooling coolant from the t-stat housing, enough to make a mess I'd rather not have on the garage floor, so I want to change the gasket. My original plan was to drain all the coolant and replace it, but given the weather and a concurrent storm of other problems, I'd rather save that for a month or so and just do the t-stat gasket. Any reason not to do it that way? I.e., is it necessary or recommended to drain the block before doing the t-stat? Or can I just put on goggles, remove the housing, replace the gasket, put the t-stat back in and start it up?
The coolant does need to be changed -- it's about four years old -- but is and has always been the correct coolant.