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Hot air from the vents (heating blocked) and water dripping into the cabin (m...

Q: What are the symptoms of Hot air from the vents (heating blocked) and water dripping into the cabin (m... in BMW E46 320d?

No cold air from vents. Water dripping into cabin or wet carpets

Q: How to fix Hot air from the vents (heating blocked) and water dripping into the cabin (m... in BMW E46 320d?

You should remove the section of solenoid valves near the brake servo, clean them and start 'briefly' by turning the ignition on and off, or replace the faulty valves with new ones. A highly reliable wear component for almost all classic BMW models.

in BMW E46 320d (1998-2011)

Symptoms

No cold air from vents
Water dripping into cabin or wet carpets

DTC error codes

Brak

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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

Refrigerant specifications for this model are available in the catalog.

Open refrigerant database

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