drained the coolant system to replace water pump gaskets this fall. have not touched car since. forgot that i filled it with plain old water to test for leaks. fast forward to today. went out to finally put stabil in and yeah she is frozen. while heating the garage might be doable i am thinking of draining the radiator and adding hot water and antifreeze in to "thaw" it. I feel like an idiot. Any suggestions? radiator is still water not ice but coolant lines seem frozen. started it before checking and water pump turns fine, temp reading shot right up to high mark so i am sure lines are frozen.