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Mercedes-Benz · Electric Drive

High-voltage cabin heater (PTC)

The electric heating element that warms the cabin and helps pre-condition the battery, running directly off high voltage.

Also called PTC heater, HV heater.

How you know it is this

  • No cabin heat
  • A heater fault code
  • Battery pre-conditioning not working
  • An isolation fault traced to the heater

Worth knowing before you buy

  • HIGH VOLTAGE. Despite being a heating element, this is not a low-voltage part and must be treated as high voltage.
  • Matters less for comfort here than almost anywhere, but it is also used to pre-condition the battery before rapid charging — so a failure can slow charging even in summer.
  • It is a common source of isolation faults as it ages, because the element runs at high voltage and its insulation degrades.
  • Cars with a heat pump use it only as a booster, so a failure may be less obvious.

What we need to quote it. The chassis number and the fault codes. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.

Electric coolant pumpsExpansion tanks and linesChiller / heat exchangerHeat pump and valvesHV cabin heater
EV thermal management — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the thermal management

All electric drive parts
Get in touch

High-voltage cabin heater (PTC) for your Mercedes-Benz?

Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.

Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)