Hyundai i20 Quiz
Heating, Ventilation and Air Conditioning

PTC HEATER Description and Operation

In this manual: Heating, Ventilation and Air Conditioning
General Information — 17Engine Mechanical System — 79Engine Electrical System — 50Emission Control System — 22Engine/Fuel Control System — 107Clutch System — 27MANUAL TRANSMISSION SYSTEM — 21Drive Shaft and Axle — 18Suspension System — 29Steering System — 21Restraint — 41Braking System — 53Body Work (Interior and Exterior) — 190Body Electrical System — 181Heating, Ventilation and Air Conditioning — 58
~1min read

Description

A PTC (Positive Temperature Coefficient) heater is installed at the outlet or at the rear of the heater core. The PTC heater is an electric heater that uses a PTC element as an auxiliary heat source, which compensates for the lack of internal heat source in the diesel engine and is highly efficient. The electric heating system heats the passenger compartment by heating the direct air from the heater. As the name suggests, the resistance of the proportional element is sensitive to changes in temperature.
Operating Principle: The ECM outputs the PTC ON signal and activates PTC relay 1. The heater controller controls PTC relay 2 and PTC relay 3 at 15-second intervals. However, PTC relay 3 can operate when the battery voltage is above 12.4 V. The PTC heater operates under the following conditions:
  • Battery voltage: 12.4 V or more
  • Blower motor: operating
  • Ambient and Coolant Temperature
Temperature
TEMPERATURE		 Coolant
TEMPERATURE		 PTC
Operation
Below -20°C
(+4°)		 Below 75 °C WE
10°C (50°F) Below 65 °C WE
12 °C or higher - OFF
- 80 °C or higher OFF

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A quick Hyundai i20 quiz: every answer comes with an explanation and a link to the manual page.