I have a W204 Mercedes where the cabin fan (fan for heater, and aircon) recently started to not work in specific situations.

In the morning when engine and everything are cold, the fan blows fine, at low setting all the way to highest; air conditioning works too.

Once I drive in hot weather, then park and switch off, switching the car on right after results in the fan not working at all. All the way from low to high setting.

Once I park in shade for some hours, or overnight, the fan will work again.

Has anyone experienced this before? Im guessing the issue is with the blower fan? What could be wrong with it?

  • This is just a guess, hence it's a comment rather than an answer: relays can sometimes stop working when they get hot, you may want to replace the blower relay.
    – GdD
    May 8, 2021 at 14:19
  • @GdD I have the car booked in for a repair service in a few days. Will let you know what the report is from that. Cheers
    – pnizzle
    May 10, 2021 at 22:15
  • They ended up replacing the blower regulator. MBA2128702110.
    – pnizzle
    May 16, 2021 at 2:04
  • Good to hear it's fixed @pnizzle.
    – GdD
    May 16, 2021 at 12:45


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