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Asymmetric cooling (driver/passenger different temperature)

Q: How to fix Asymmetric cooling (driver/passenger different temperature) in BMW X5 (E70)?

An effective repair involves replacing the entire heater valve module (Heater Control Valve) under the hood with a new one. High failure rate, the defect becomes visible on a mass scale when these vehicles reach the age of 7-8 years.

in BMW X5 (E70) (2007-2018)

Symptoms

Different temperature on both sides of the cabin

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

(G05)

Refrigerant: R1234yf Amount (g): 600-650g Oil: PAG YF ISO 46 Oil (ml): 150 - 180ml

(F15)

Refrigerant: R134a Amount (g): 675g Oil: PAG PAO 68 lub PAG ISO 46 b.d. Oil (ml): b.d.ml

(F15)

Refrigerant: R134a Amount (g): 700-750g Oil: PAG 46 Oil (ml): 160 - 190ml

See full specification

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