My coolant reservoir is empty (I've yet to check directly into the radiator to determine if it's still full) and I'm getting a slight 'burnt coolant' smell when I turn on the heater fan after it's been off for awhile. I think the problem might be do to a leaky heater core but I welcome any other suggestions? I don't want to have the heater core replaced if the problem might be attributed to a leaky hose. Pars