Coolant Change
I have a Volvo MD2030 (3 cylinder - 29 HP) engine. On my engine, there is a square drain plug on the starboard side of the block near the oil filter (although my owner's manual shows a petcock). All of the other "bolt heads" are hexagonal. This was the only square headed bolt or plug. There was no where (or good way) to drain this, so I just directed the flow into the sump under the engine. I then used a shop vac to suck up the fluid, after which I tranferred it to a jug for later disposal at a recycling facility.Then I flushed the engine with fresh water and "sucked this up" as well. That water was quite clear, so I dumped this down the sanitary sewer system.Hope this helps,Tom