I have the same vehicle as you and changed my blower regulator just this past august. Simple job once you get to the blower. If you look under my earlier posts from around august you will see where the folks in this forum gave me all the info I needed. The regulator was not cheap though. I think I paid about $235 for the upgrade version. Based on my research I recommend that cause the OEM model will only burn out again.

Good luck

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KCScout
98 S420 My Wife's Baby
97 S320 My road car
83 300D My old road car (love that diesel)
81 300SD Wife's former Baby
81 240D A fun stick shifter
71 220D My first one