i have a coolant leak coming from the block heater. is the only way for me to fix this to drain the coolant, and remove the plug? its not leaking bad, but it is leaking enough to mark its spot when sitting overnight. ***UPDATE*** well, it stopped leaking there for a while, all on its own. then i plug it in and o man, looked like someone wizzed under the truck. it was really leaking bad. 2 days later, it slowed back down. i have had almost no time to fix this properly, if it is leaking more when plugged in, could this be the actual block heater? or just from the temp difference when the block heater is warming up and the block isnt?