Hyundai Elantra: Heater / PTC Heater Description and Operation

Description
The PTC (Positive Temperature Coefficient) heater is installed at the exit or the backside of heater core.
The PTC heater is an electric heater using a PTC element as an auxiliary heating device that supplements deficiency of interior heat source in highly effective diesel engine. The electric heater heats up the interior by directly heating the air that passes through the heater. The name itself implies that the element has a proportional resistance change sensitive to temperature.

Operation Principle
ECM outputs a PTC ON signal and operates PTC relay 1. Then heater controller operates PTC relay 2 and PTC relay 3 with an interval of 15 seconds.
However, PTC relay 3 can be operated while battery voltage is above 12.4V.
Operating Condition
PTC heater operates according to the following conditions;
Battery voltage: 12.4V or above
Engine : Running
Ambient temperature and coolant temperature
Ambient
Temperature
Coolant
Temperature
PTC
Operation
Below -20°C (-4°F)
Below 75°C (167°F)
ON
10°C (504°F)
Below 65°C (149°F)
ON
12°C (53.6°F) or above
-
OFF
-
80°C (176°F) or above
OFF

Heater Core Repair procedures
Replacement 1. Disconnect the negative (-) battery terminal. 2. Remove the heater and blower assembly. (Refer to Heater - "Heater Unit") 3. Remove the heater core cover (A) after loosen ...

PTC Heater Repair procedures
Inspection Operating Logic Test (Manual only) Inspect the PTC operation by confirmation logic as follows. 1. Entering (1) Set the Floor mode and maximum heating position. (2) Turn off the ...

Other information:

Hyundai Elantra AD (2016-2020) Service Manual: Specifications
Specification ItemTypeBulb Watt (W)FrontHead lamp(Halogen)HalogenLow beam / High beam9005L+ / H7LL60 / 55Turn signal lamp / Position lampPY28W/8W28/8HID + D.B.LLow beam / High beamD5S / H7LL25W / 55Turn signal lampPY28W/8W28/8Side marker W5W5Daytime Running Light (DRL) P21W21Door mirror turn ...

Hyundai Elantra AD (2016-2020) Service Manual: Dynamic Damper Repair procedures
Removal 1. Remove the front driveshaft. (Refer to Driveshaft Assembly - "Front Driveshaft") 2. Remove the TJ joint assembly. (Refer to Driveshaft Assembly - "TJ Joint") 3. Remove the remove the both side of band (B) of the dynamic damper (A). 4. Fix the driveshaft (A) with a vice ...

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