Kia Sportage: Heater / PTC Heater Description and operation
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.
![](images/ptc_heater_description_and_operation-1721/601/stlha6013d_n.gif)
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
|
• |
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
|
![](images/ptc_heater_description_and_operation-1721/601/sgdha2135e_n.gif)
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Recover the refrigerant with a recovery/recycling/charging station.
...
Inspection
Operating Logic Test (Manual only)
Inspect the PTC operation by confirmation logic as follows;
1.
Entering
(1)
Se ...
Other information:
To turn on the high beam headlamp, push the lever away from you. The lever will
return to its original position.
The high beam indicator will light when the headlight high beams are switched
on.
To turn off the high beam headlamp, pull the lever to you when the high beam
is on. The lever w ...
Removal and Installation
Removal of the thermostat would have an adverse effect, causing a lowering
of cooling efficiency. Do not remove the thermostat, even if the engine
tends to overheat.
...