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Unpleasant odor (musty/mold) and fogging of windows in the cabin

Q: What are the symptoms of Unpleasant odor (musty/mold) and fogging of windows in the cabin in Mazda MX-5?

Musty mold odor from vents. Fogging windows

Q: How to fix Unpleasant odor (musty/mold) and fogging of windows in the cabin in Mazda MX-5?

Mechanical unblocking of the condensate drain channels (evaporator drain) and the windshield, replacing the cabin filter, and then carrying out the evaporator drying procedure (full heating in a closed circuit with A/C turned off for 15 minutes) and applying the original encapsulating coating 'Mazda Air Cooling Coil Coating' using a special gun.

in Mazda MX-5 (1998-2026)

Symptoms

Musty mold odor from vents
Fogging windows

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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

ND (–Obecnie) - Mikrokanały

Refrigerant: R1234yf Amount (g): 360g Oil: PAG 100 YF Oil (ml): 130ml

NA - Konwersja (Retrofit na R134a)

Refrigerant: R134a Amount (g): 630g Oil: PAG 100 Oil (ml): 248ml

NA - Układ Fabryczny

Refrigerant: R12 Amount (g): 800g Oil: Olej mineralny Oil (ml): 175ml

See full specification

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Unpleasant odor (musty/mold) and fogging of windows in the cabin

Symptoms

A/C Technical Specifications

Other problems in MX-5

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