Why It's Probably the Alternator Belt
* Engine Speed Correlation: The squeaking noise that changes with engine speed is a classic symptom of a slipping alternator belt. This belt drives the alternator, which generates electricity for your car. When the belt wears, it loses its grip and slips, causing the squeaking.
* Checked the Belt, But... You mentioned checking the belt. Here's why it might be the issue even though you've looked:
* Visual Inspection Isn't Enough: A visually good belt can still have microscopic cracks or wear on the inside that cause slipping.
* Tension: The alternator belt needs to be at the right tension. If it's too loose, it will slip. Even if you think it's tight, a slight adjustment can make a big difference.
Other Possible Causes (Less Likely, but Worth Checking)
* Water Pump Bearing: If the water pump bearing is worn, it can create a high-pitched squeal that increases with engine speed.
* Idler Pulley: A worn idler pulley (the one that guides the belt) can cause squeaking.
Troubleshooting Steps
1. Thorough Belt Inspection:
* Visual Check: Look for cracks, fraying, or any sign of wear.
* Touch Test: Feel the belt for any looseness or unusual stiffness.
2. Belt Tension:
* Check Tension: Use a tension gauge if possible, or look for the "finger test" instructions in your car's manual.
* Adjust Tension: If the belt is too loose, adjust it by turning the alternator's adjusting bolt (usually located on the side). Refer to your car's manual or a repair guide for the correct tension.
3. Other Components:
* Water Pump: Listen for any noise coming from the water pump area.
* Idler Pulley: Spin the idler pulley by hand. If it makes any noise or feels rough, it might need replacement.
Next Steps
* Replace the Belt: If the belt is worn or damaged, replace it with a new one.
* Consult a Mechanic: If you're unsure or can't find the cause of the squeaking, take your Peugeot 106 to a mechanic.
Remember: Ignoring a squeaking alternator belt can lead to serious problems, like a loss of power steering or a dead battery.
