What Causes the Abnormal Noise When the Tiida's Air Conditioning is On?
3 Answers
There may be several reasons for abnormal noise when the Tiida's air conditioning is on: Dirty Air Filter: A dirty air filter can cause excessive noise and abnormal sounds. Debris in the Blower Fan Blades: Debris in the blower fan blades can lead to abnormal noise. You can test this by turning on the blower fan without starting the engine. If the noise appears, it confirms the issue is with the blower fan. Fan Problems: Deformed fan blades or a damaged fan motor in the car's air conditioning system. Worn Clutch Bearing: Worn clutch bearings inside the air conditioning pump can cause the engine noise to increase when the air conditioning is on. This component cannot be replaced separately; the entire air conditioning pump assembly needs to be replaced.
My Tiida also made strange noises when the AC was on, like a buzzing vibration from the dashboard. The most common issue is the blower motor—that little fan that blows air—possibly due to lack of lubrication in the bearings or leaves caught in the blades. Taking it apart for cleaning usually fixes it. Another culprit could be the AC compressor; if it makes a rattling sound upon startup, it might be due to incorrect refrigerant levels or worn bearings, requiring a mechanic to check with a pressure gauge. Worn-out belts can also cause a screeching noise when starting the AC on a cold engine, so inspect the belt tensioner for looseness. Loose underbody pipes might cause a rattling sound while driving. First, try to locate the noise: if it’s near the windshield, it’s likely the blower motor; if it’s from the engine bay, check the compressor and belts.
As a technician who has worked on many Nissans, the Tiida's AC abnormal noises usually come from a few areas: First, the blower motor—worn carbon brushes can cause a rustling sound, and replacing the entire assembly costs around a thousand bucks. Second, the compressor—a refrigerant leak at the high-pressure pipe connection can produce a hissing noise, and in severe cases, a squeaking sound. Third, a poorly installed cabin air filter can cause the filter box to resonate with a clicking noise. Fourth, a failed cooling fan bearing can create a humming noise at high temperatures. Last month, I worked on a Tiida where the expansion valve was clogged, causing a liquid hammering sound, like banging on a water pipe. Don’t randomly dismantle the dashboard—it’s easy to break the clips. The simplest way is to increase the fan speed and listen for changes in the noise. If there’s no improvement, take it to the shop for a compressor diagnosis.
