Hi , When i first start my car up and drive it, its making a squeaking sound. My car is a Peugeot 307. Its sounds as though its the fan belt. Do you think this could be the case and if so what is the procedure to fix it?. Thank you for your help.
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If I understand this, your fan and other belts driving components in the engine bay stop squeaking when stepping on the brake? Your belts may need some adjustment to tighten. But it may be a vacuum hose leaking around the power brake chamber, or it is leaking, and sounds like the squeeking you describe. I would temporarily confirm the belt squeak by using a "Belt dressing spray" from your auto parts store, to see if it really is the belt or a possible vacuum leak. My belts squeak sometimes after the first start of the day in cold weather since the alternator is working very hard to recharge the battery after the start. It will be quieter when the engine is slowed down as in your braking scenario.
it could be one of the belts. if you put a little wax or brake fluid on the belt in a couple of places and the squeak goes away then you either have a loose belt/s or the belts/s need replacing. if no change it could be the timing belt making the noise.
it could be the clutch throw out bearing making the noise however it still could be a belt.check the condition of the belt and tightness of the belt(s) as well as the tensioner first as this is the cheapest to do if its the problem.the reason the noise goes away while driving is because the load(torque) on the component is less than when your taking off from a stop or driving slow.
The problem is the rear motor mount is filled with hydraulic fluid that leaks onto the accessory drive belt. The motor mounts fail prematurely and the fluid makes the belt squeak. Toyota dealership I took my 2006 Corolla to replaced the motor mount and belt free of charge.