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Cabin blower does not work or works only on maximum speed

Q: What are the symptoms of Cabin blower does not work or works only on maximum speed in Volkswagen Passat B6?

No cold air from vents. Blower works only on highest speed

Q: How to fix Cabin blower does not work or works only on maximum speed in Volkswagen Passat B6?

Replacing the damaged blower resistor from behind the passenger glove compartment. The lack of air conditioning may be due to the cabin air vent not working (so-called Interlock). Always make sure the blower is spinning in all speeds.

in Volkswagen Passat B6 (2006-2010)

Symptoms

No cold air from vents
Blower works only on highest speed

DTC error codes

Shutdown code: 7 (Blower Off)

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Technical diagnosis (Premium)

Recognized technical fault:

Auxiliary controller voltage instability detected

Technical analysis

Detailed analysis of HVAC controller operation parameters, CAN bus data readings, and diagnostic signal waveforms. Purchase PRO access or log in to read the full fault analysis.

Confirmed solution

Complete step-by-step repair procedure including module non-volatile memory reset, sensor calibration, and correct wiring routing. Unlock the full report to see the instruction.

Parts needed

Filters ferrite anti-interference / noise suppressor
Auxiliary starting battery (depending on cell status)

Workshop hacks

Important workshop tips for mechanics regarding bypasses without expensive control module replacement and manufacturer software service bulletins.

TSB / TPI service bulletins

TSB-24-HVAC-01TPI-2068943/2

A/C Technical Specifications

B9 (CJ5)

Refrigerant: R1234yf Amount (g): 460g Oil: PAG ISO 46 YF Oil (ml): b.d.ml

(B8) kompresor Denso 6SES14C + 6SAS14

Refrigerant: R1234yf Amount (g): 460g Oil: N 052 535 A0/B0 PAO 68 AA1 Oil (ml): 110ml

(B8) kompresor MAHLE/Delphi 6CVC140 + Visteon

Refrigerant: R1234yf Amount (g): 460g Oil: N 052 535 A0/B0 PAO 68 AA1 Oil (ml): 120ml

See full specification

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