MB Stars you are excellent. That's exactly what happened. I turned back the ignition key a little bit and the fan was then started.

So, you are right at the dot that I would need to replace the ignition switch behind the steering lock assembly.

Please also enlighten on what other possible problems a faulty steering lock assembly could cause in future, which you mentioned in your post earlier. Thanks.

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Edwin Li
W123, 1984, 2Litre gasoline, manual