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Old 04-06-2002, 01:03 AM
jgl1 jgl1 is offline
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Join Date: Mar 2000
Posts: 517
Jiggling the key doesn't help....there is just no high fan speed, whether in manual or automatic mode.

Unlike the W140, a replacement blower motor for the R129 does not come equipped with a regulator. But is it prudent to replace the motor when a new regulator is installed?

I assume blower motor function could easily be determined by supplying 12 v direct and checking function and amperage draw; high speed operation in the absence of the regulator would rule out a blower motor problem, provided the amperage is within specs.

Could a pushbutton control unit malfunction also result in loss of high fan speed, while leaving the three lower speeds functional?
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