I've been told by the previous owner that my 340 has heated seats. But I can't find the button nor can I find it anywhere in the manual. Was he telling porkies or does it really have them? Where can I find the mysterious button?

should be just behind the handbrake handle on the back of the centre consol,look under your seat you should see the cables

On earlier cars there was no switch, they came on automatically below a certain temperature. But on yours there should be a button for them between the seats, as littered says ...

Tom

Bleh, I must be blind. Unless it's the ones that I thought were the switches for the back windows! I'll take a look after work

That sounds like the ones The diagrams on them can wear off after a while.

Tom

They are still thermostatic though, the switches do not necessarily turn them on. The thermostats and heating elements do tend to fail after a bit of bum wear. I have overhauled mine, and fixed the lumbar support at the same time, which needed welding. All fairly straight forward.