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Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 4808
Experience:  15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.
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2007 S600 a/c compressor won't come on, front blower won't

Customer Question

2007 S600 a/c compressor won't come on, front blower won't come on. Code 951B Blower Regulator has under voltage or over voltage. The compressor ground is good. Only 3.4 Volts on the power side.
Submitted: 1 year ago.
Category: Mercedes
Customer: replied 1 year ago.
I have checked to make sure the a/c off is not marked on the display
Expert:  Lou P. master tech replied 1 year ago.

Hello , the compressor is a variable compressor so it will have varying voltage, the front blower motor or regulator will be why the fan is not coming on, we need to access the regulator and check for power supply to determine if the fan or regulator is the issue.

have you removed the regulator or blower?