It is definately the blower resistor. Both my 4-cylinder 124s without aircon have it. Not many have the electronic climate control in UK, not even sure if it was available on 4-cyl models.

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Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)