The fan motor for the climate control on my 98 ML 320 will now only operate at the highest setting (4). It doesn't appear to run at the lower speeds. Does this MB model have a blower motor regulator like my E300 or not. If not, I suspect the fan motor is bad. The dash switch seems tight as ever but I suppose that may be the problem. Any recommendations would be appreciated. TIA.

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99 E300 133K
98 ML320 99K
87 Saab 900 Turbo Conv 123K