Motorists are being urged to think twice before reaching for a can of lubricant if they hear a high-pitched squeal when starting their car, as it could lead to serious engine damage and costly repairs.
Experts at vehicle repair finance provider Bumper have issued a warning over a common but potentially dangerous misconception that a squeaking fan belt can be fixed with a squirt of lubricant. In reality, they say, this quick fix could lead to the belt slipping, failing, or even taking down other vital engine components with it.
“A squeaking noise from under the bonnet is often the first sign your fan belt is wearing out or has lost tension,” a Bumper spokesperson said. “It’s a really common issue, but the wrong fix could end up costing you dearly.”
The fan belt, also known as the auxiliary belt, plays a critical role in modern vehicles by powering components like the alternator, water pump, air conditioning, and power steering.
Over time, the belt can stretch or wear down, and one of the earliest warnings is a squeak or chirp, often when starting the engine or accelerating.
However, many drivers instinctively spray the belt with a lubricant to silence the sound – a move that could make things worse.
“Fan belts are designed to run dry,” Bumper said. “Lubricating them can cause them to slip off the pulleys. If that happens while the engine is running, it can lead to overheating, electrical issues, or total engine failure.”
In older vehicles, the issue might be resolved by manually tightening the belt. But most modern cars are equipped with automatic tensioners, meaning a squeaking belt is more likely a sign it needs replacing.
Ignoring the noise could lead to breakdowns and a repair bill well over £200. In contrast, a new fan belt typically costs between £100 and £200, a fraction of the potential damage if it fails.
Bumper advises drivers to always take squeaking sounds seriously and get professional help rather than trying DIY fixes.
“If you hear that high-pitched squeal, book the car in,” they said. “That sound is your car’s way of warning you something’s wrong.”