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Poor air conditioning performance and poor interior heating

Q: How to fix Poor air conditioning performance and poor interior heating in Mazda CX-30?

Replacing the damaged water flow valve (CCV) with a modified part free from the manufacturing defect and mandatory uploading of new PCM controller software using the MDARS dealer system for calibration.

in Mazda CX-30 (2014-2025)

Symptoms

Warning light on dashboard

DTC error codes

P0126:00

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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

(BP)

Refrigerant: R1234yf Amount (g): 420-470g Oil: PAG YF ISO 46 Oil (ml): 110 - 140ml

5 (KF) 2,0 i / 2,5 i

Refrigerant: R1234yf Amount (g): 500g Oil: FD46 YF PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 100ml

5 (KF) 2,2 D

Refrigerant: R1234yf Amount (g): 480g Oil: FD46 YF PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 100ml

See full specification

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Poor air conditioning performance and poor interior heating

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in CX-30

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