Humid and rainy weather not only causes physical discomfort but also threatens the blower, a core component of the automotive air conditioning system. During the plum rain season, problems such as abnormal noises, short circuits, or even complete failure of the blower due to moisture frequently occur. This article provides a systematic solution from prevention measures to emergency handling.

I. Typical Symptoms of Blower Moisture Damage.

1. Abnormal Noise: "Creaking" friction sounds or metallic clanging during operation.

2. Unstable Airflow: Erratic air volume from the air conditioner with failed button adjustments.

3. Burnt Odor: Overheating of circuits caused by short circuits in the blower motor.

4. Intermittent Malfunctions: Difficulty starting on rainy days, normal operation in dry weather.

II. Blower Moisture Prevention Guide for Rainy Seasons (Preventive Measures).

Parking Environment Management.

• Avoid long-term parking in low-lying waterlogged areas.

• Place dehumidifying boxes (silica gel desiccants recommended) when parking in underground garages.

• Use car covers for outdoor parking, paying special attention to the engine compartment's sealing.

Air Conditioning System Maintenance.

1. Regular Air Conditioner Filter Replacement: Moist filters accelerate blower corrosion (inspection recommended every 6 months).

2. Proper Air Conditioner Use in Rainy Days:

• Turn on the AC mode and external circulation for 10 minutes immediately after starting the vehicle.

• Switch to internal circulation for 3 minutes to dehumidify before turning off the air conditioner.

3. Install Moisture-Proof Sheaths: Apply waterproof silicone grease to the blower motor interface (professional operation required).

Key Daily Inspections.

• Check whether the blower drain hole is blocked monthly.

• Observe for water accumulation under the floor mats (may seep into the blower compartment).

• Test the blower's resistance value before and after the rainy season (normal range: 0.8-1.5Ω).

III. Emergency Handling Solutions for Sudden Faults.

Situation 1: Blower Abnormal Noise/Stall.

1. Turn off the air conditioning system immediately.

2. Blow with maximum hot air for 10 minutes (without starting AC).

3. Remove the air conditioner filter to check for water accumulation (can be dried with a low-temperature hair dryer).

Situation 2: Circuit Short Circuit.

1. Disconnect the negative battery terminal (to prevent circuit burnout).

2. Check the fuse box at positions F21/F22 (most models use a 15A blower fuse).

3. Clean oxide from the blower plug with anhydrous alcohol (wear insulated gloves during operation).

IV. Comparison of Rainy Season Maintenance Costs.

Significant economic differences exist among different protection schemes:

• Regular Moisture Prevention: Annual cost of $10-$25, preventing over 90% of blower faults.

• Waterproof Sheath Installation: One-time investment of approximately $30, saving long-term circuit maintenance costs.

• No Protection: No maintenance expenses, but fault repair costs as high as $100-$300.

Summary

80% of blower faults in rainy seasons stem from lacking daily protection. It is recommended to conduct quarterly special inspections and activate the "blower drying procedure" (warm air internal circulation + slightly open windows) after heavy rain or waterlogging. In case of burnt odors or smoke, cut off the power immediately and contact professional maintenance services.