325is 1994 starting problem...

Sounds to me more like an ignition switch problem than a starter problem, but it could be either. I think it's unrelated to coolant level problems, but as you probably already know, you should get that fixed too. I'd be worried about where that coolant was going, for instance.

Ed

If you get a click it sounds like the switch and relay are operating - although relay contacts can go bad so I'd change that first. I dunno your model but there might be an identical one for an other purpose fitted to the car which you can swop it with to check.

Next to check is the pull in solenoid for the starter pinion jamming through dirt or corrosion. It's the cylindrical thing mounted on the starter motor. After it engages the pinion contacts operate the starter motor.

If it is the solenoid that depends on the labour cost of finding out what is wrong. The solenoid can be cleaned/replaced on its own.

Many minor leaks are difficult to trace because the coolant evaporates off on a hot engine, and the leak stops when cold with no pressure in the system. The way to find these is to use a special dye in the coolant and pressurise the system cold using compressed air. A prime candidate for this sort of leak is the water pump.