Positive Temperature Coefficient (PTC) Cabin Heater - Description

DESCRIPTION





An electric Positive Temperature Coefficient (PTC) heater (1) aids in passenger compartment heating by compensating for the slower warm up rate of the diesel engine.

The PTC heater unit is located in the HVAC air distribution housing, downstream of the heater core and is controlled by the Engine Control Module (ECM).

The PTC heater consists of heating elements with fins (2) that transfer the heat to the conditioned air flowing within the air distribution housing. The PTC heater unit is connected to the vehicle electrical system by a positive terminal (3), control circuit connector (4) and a ground terminal (5).

The PTC heater unit can be accessed for service without removing the instrument panel.