Heater only blows cold air!

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Equally likely to be a temp sensor. Best to get the fault codes read before going any further.
Apologies for coming to this thread late in the day. (Cough)

I did have a similar problem on my 2004 E500 one cold weekend trip down to Cornwall. Very irritating way to visit Padstow in February.

Imagined something expensive. Got all the way back to London and realised it was the temperature sensor dangling from the front of the car. Pushed it back into place and the problem was fixed.

This was six or seven years ago. Can't remember the exact detail, but worth a root around the front to see if the sensor has moved, fallen or failed.

This might be a complete red herring, but I thought I'd just throw this into the mix.

This kind of story: W211 External temp sensor location | Engine

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