Has the needle ever crept above the 12 o'clock position? If it has then you need a new water pump. With no heat you either have an air pocket or the heater valve is bad. They now seller brand new aftermarket valves for little money on ebay. If you have an air pocket then you also have a leak somewhere and you have to find it otherwise you may overheat and warp the head. Its also possible that the thermostat has failed in the failsafe open position.
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The M50 has a notorious spot where it can leak coolant, the back of the head there is a fitting where the gasket fails, there is an upgraded aluminum pipe fitting available.
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Click the search button, select "search single content type", select the "e36 sub forum" specifically, try the "search titles" then try the "search entire posts".
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