estimating said cooling amount, based on an estimation result of said fuel cell, when {HEAD ~ the step} of detecting {TAIL ~ the temperature} of said refrigerant malfunctions 
estimating said cooling amount , based on an estimation result of said fuel cell , when { HEAD ~ the step } of detecting { TAIL ~ the temperature } of said refrigerant malfunctions
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH