Most vehicles are fitted with heating systems.The engine cooling liquid is traditionally used as an energy source for heating purposes. Part of the heat produced by the engine is channelled to the
cabin via the heating radiator. The heating components are located inside the Heating, Ventilation and Air Conditioning system (HVAC), after the blower.
An additional electric heating device called a Positive Temperature Coefficient, or PTC, is sometimes added to a system to provide additional heat during some transient phases.
PTC’s are self-regulated electric heaters used to complement the main heater core. They are generally located after the heater core but can sometimes be placed in the ducts (the feet heater). PTC’s are often introduced to climate control systems to compensate for a lack of heat availability, which can be the case with high efficiency engines.
On Electric Vehicles (EV’s) and hybrid cars the additional heater located in the HVAC may be high voltage driven.All appropriate measures must be taken prior to servicing this part.
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