Volkswagen Polo Service & Repair Manual: Odor from Evaporator or Heat Exchanger?

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / Concerns / Odor from the Heater and A/C Unit / Odor from Evaporator or Heat Exchanger?

Fishy smell

–	From leak at cooling system of engine or of A/C system heater core.

Note

If the fishy smell gets weaker when the temperature is set to “cold” and stronger when it is set to “warm”, then check the heat exchanger for leaks.

Smells like a burned clutch.

Evaporation from floor mats, decorative seat covers, etc.

Musty smell

–	Due to various contaminants, such as leaves, pine needles, etc. collecting.

Note

Clean the plenum chamber.

–	Due to water that cannot drain out of the plenum chamber.

Note

Check that the plenum chamber water is draining.

Odor from the Heater and A/C Unit

Note

Odors originating in the heating and A/C unit can mainly be detected in fresh air mode and recirculated air mode.

–	Due to too much condensation water in A/C unit.

Note

Check the condensation water drain. Refer to → Rep. Gr.87 in the vehicle-specific Repair Manual.

–	Due to an old or heavily contaminated dust and pollen filter.

Note

Check the dust and pollen filter. Refer to → Rep. Gr.80 in the vehicle-specific Repair Manual.

–	Due to deposits on evaporator fins.

Note

Clean the evaporator using the Ultrasound A/C Cleaner -VAS6189A-. Refer to → Chapter „Ultrasound A/C Cleaner -VAS6189B-“ or the Suction Feed Spray Gun -VAG1538- and a suitable spray nozzle. Refer to → Chapter „Evaporator, Cleaning with Suction Feed Spray Gun -VAG1538- and Spray Nozzle“.

Odor from the Heater and A/C Unit

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Ultrasound A/C Cleaner -VAS6189B

The Ultrasonic HVAC Cleaning System -VAS6189A- is placed in the front passenger footwell and sprays Aero-Clean. Aero-Clean neutralizes microbes and bacteria inside th ...

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