What Causes the Abnormal Noise in Volkswagen Lavida's Air Conditioning?
3 Answers
Volkswagen Lavida's air conditioning abnormal noise reasons are as follows: Damaged Compressor Electromagnetic Clutch: As a high-speed rotating working component, the air conditioning compressor has a relatively high probability of failure, with abnormal noise being a common issue. There are many reasons that can cause compressor noise, such as damage to the compressor's electromagnetic clutch. Severe Internal Wear of the Compressor: Both can produce abnormal noise. There should be a certain gap between the compressor mounting surfaces. If the gap is too large, the impact will also increase. If the gap is too small, the electromagnetic clutch will create movement interference with the compressor mounting surface during operation, which is another common cause of abnormal noise.
Once when I was driving my Lavida, I heard a squeaking noise from the AC. After checking, I found that AC abnormal noises could involve several areas. The most common issue is a problem with the compressor, such as internal bearing wear or clutch slippage, which produces a particularly harsh metal grinding sound. If the blower has abnormal noises, it’s likely due to leaves stuck in the blades or lack of lubrication in the bearings, resulting in a whirring sound that changes with the fan speed. The sound of refrigerant flow is a slight hissing noise, which becomes more noticeable if the pipes are blocked. Another hidden issue is the evaporator freezing up, which can suddenly produce cracking sounds when the ice melts. These abnormal noises are not only annoying but can also affect cooling performance. It’s recommended to use a diagnostic tool to read fault codes, with a focus on checking whether the compressor’s operating current is abnormal. The blower is actually quite simple to disassemble—just remove the glove compartment to access it.
I've encountered various strange noises while repairing the Lavida's air conditioning system, so I'd like to share some experience: The brief rustling sound when first turning on the AC is usually normal refrigerant flow and nothing to worry about. However, continuous whistling noises should raise concerns about expansion valve failure. The rattling noise often indicates leaves stuck in the blower fan. If you hear sharp sounds from the pulley direction, it's mostly caused by an over-tightened compressor belt or bearing wear. The most troublesome is the clattering sound inside the dashboard, which might mean the evaporator bracket has come loose - this requires dashboard removal. When troubleshooting, first identify the sound location: removing foreign objects from the blower fan is relatively easy, but refrigerant issues require professional pressure testing at a shop. As a reminder, excessively dirty filters increase blower load and can cause abnormal noises - they should be replaced every 20,000 kilometers.
