type44 how do i know if i have a heater core leak?

[JordanVw at aol.com]

i have been getting a few small drops of coolant in my drivers footwell, up 
towards the accelerator pedal, once in awhile..  sometimes smell a faint 
coolant smell when running the heater, but not all the time.   could this be 
the start of a heater core leak?

would it be a good time to do the blower motor the same time as the heater 
core (blower sticks sometimes) to save on labor time?  
TIA
chris
'86 5kT
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