Dodge Sprinter 3500 - Manual (Page 104)

CODE HB9
102 HEATING/COOLING
AUXILIARY HEATER (AIR)
Auxiliary electric
hot air heater
Details and Technology
The heater booster consists of radiator elements (fins) which are fitted with PTC (Positive Temperature
Coefficient) resistors and are held together in a mounting frame by spring clips. When an electric voltage
is applied to the heater elements, an electric current flows through the PTC resistors, which heat up. The
fins absorb the heat and radiate it to the passing air. As soon as the engine is running, the electric heater
booster steadily increases its power from 0 to 100% in the space of 28 seconds. The heater booster
is situated in close proximity to the air outlets, to keep heat losses to a minimum. The warmed air is
circulated into the interior via the vehicle heater/blower system.
Switch-on conditions:
Coolant temperature < 80°C (176°F) and ambient temperature < 10°C (50°F).
Switch-off conditions:
Coolant temperature > 80°C (176°F) and ambient temperature > 13°C (55°F).
Benefits and Arguments
• Aids quick defrosting of the windows
•
Quick defogging
• Quicker warming of the interior
• Environmentally friendly, robust, long service life
The electric PTC heater booster is environmentally friendly, since no emissions are generated. Despite its
lightweight, compact design it is robust, has a long service life and is highly efficient. The PTC resistors
are self-regulating, to prevent overheating. The heater booster assists with quick defrosting of the
windows and helps to prevent fogging. Allows the interior to be heated more quickly for greater comfort
on cold days.
Remarks
Auxiliary electric hot air heater is standard on all models.