My 1996 C280 has a few issues. About one month ago, the heater hose from head to heater core broke, and coolant was leaking like crazy. I kept filling up the expansion tank with water before it got cold, and then antifreeze. I started it daily to get the water and antifreeze to mix together. The leaking continued (about 1 quart in 10 miles) I went away for a few days, and tried to start it when I got back. The starter engaged for a split second, and then just spins, but it is not engaging. This may be a solenoid problem due to antifreeze leaking just above the starter??? Does my diagnosis sound plausible? I still haven't gotten the leaking solved but do have the parts on order, but now I can't start the car due to the starter just spinning. Any advise is welcome. Thanks