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That depends on how, when and where it is squealing. For example, if the brakes squeal when applied, the brake pads are probably worn down. A squeal from the engine compartment whenever the engine is running could be a loose serpentine belt (especially if the squeal changes a little when you rev the engine).
It could squeal, squeak, moan, whine, groan, and leak oil.It could squeal, squeak, moan, whine, groan, and leak oil.
If the brake pads come with shims or other anti-rattle hardware and it is not used on the vehicle, the brake pads will vibrate against the rotor as they are being applied and that will cause them to squeal.
There could be a number of reasons, but most times that has happened to me, the tires were under-inflated. Check your tires.
Check all engine drive belts. Sounds like one of them is slipping.
It could be the bearing in your tension pulley.
The engine could stall when you are on the road, causing a traffic problem.
The engine is overheating.
A Volkswagen Jetta radiator fan is controlled by a fan relay. If the relay malfunctions the fan could either stay on or not work at all. An engine diagnostic would be recommended.
That's not a serial number but rather a part number--the part number for the whole engine. It could be any year.
Mine has done this twice, both times it was the pulleys in the front of the engine. It could also be the belts.
If the smoke is black it could be caused by a faulty fuel pressure regulator which could be causing the engine to get too much fuel.