Poor or Low Heater or A/C Blower Output From Vents

Leaves and debris clogging the heater core and evaporator.

When diagnosing poor heat incidents, don't overlook the possibility of debris in the heater case partially clogging the heater core and/or evaporator. Usually it can be cleaned out by removing the heater blower motor and using compressed air and a shop vacuum to remove the debris through the blower opening. Also, check the cowl for debris.