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Old 04-29-2019, 08:29 AM
Join Date: Sep 2017
Location: Suburbs of Chicago
Posts: 9
W124 blower motor regulator

What actually goes bad? The heat sink or the wired sensor that mounts onto it?

Unless itís cracked can the sink even go bad?

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Old 04-29-2019, 09:13 AM
Diseasel300's Avatar
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Join Date: May 2016
Location: Texas Hill Country
Posts: 5,425
The heat sink won't go bad unless it's heavily corroded or physically broken. The transistor pack that it cools can die, usually shorted so the fan just runs in high speed all the time. If you're replacing the transistor pack, check your blower motor while you're in there. If the brushes are worn down, commutator grooved, or bearings tight, it can cause extra stress on that module and kill it early.

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