| I replaced the water pump on my '86 Nissan pickup a few years back.  I filled the radiator up with water, checked for leaks, and drove it around.  It worked great.  The next day I went and bought coolant so when I had some time I'd drain the water and put that in.  Well, over time a forgot that a HAD NOT done this.  If you asked me if I had put the coolant in, I would have said 'yes'.  December rolled around and one morning it wouldn't start.  It froze.  After defrosting the engine I tried refilling it with coolant.  It took way too much coolant so I pulled the oil dipstick.  My oil and coolant had mixed.  I cracked the block! |