The heater core on the Maxima 2000 is 3years or 60Kms. I have over 90Kms on mine and after having the rad flushed found a 1/4" of green rad. coolant under the passenger floor mat.
Not good said the mechanic- need a new heater core and the whole front panel needs removal to install. I figured they blew it with a rad flush and would cover it.
7.2 hrs labour all told $866 but they picked up the labour which was decent of them. I wonder how often a heater core goes after 4 years?Ralph