* Wheel Bearings: These are the most common to fail and require replacement. It's a moderately challenging DIY job requiring specialized tools (bearing press, socket set, torque wrench) and some mechanical aptitude. Failure to properly install wheel bearings can lead to serious safety issues. Symptoms include rumbling or grinding noises, especially at higher speeds or when turning. Replacement is generally recommended, not repair.
* Transmission Bearings: These are far more complex to access and replace, requiring significant mechanical knowledge and specialized tools. Failure often leads to significant transmission problems and usually necessitates professional repair. Symptoms include difficulty shifting, whining noises, or complete transmission failure.
* Engine Bearings: These are located inside the engine and are the most complex and expensive to replace. They are rarely repaired; replacement of the entire engine or at least the affected components is usually necessary. Symptoms vary widely but can include knocking or rattling sounds, loss of oil pressure, and overheating.
* Other Bearings: Various other bearings exist throughout the vehicle (alternator, power steering pump, etc.). Diagnosis and repair of these usually requires specialized tools and expertise.
To summarize how to "fix" bearings: You generally *don't* fix them in the sense of repairing a damaged bearing. Instead, you *replace* the failed bearing with a new one.
Steps for replacing wheel bearings (the most likely scenario):
1. Diagnosis: Confirm the wheel bearing is indeed faulty. Listen for noises, check for play in the wheel, and potentially have a mechanic inspect it.
2. Gather Tools and Parts: You'll need a jack, jack stands (crucial for safety!), wheel chocks, lug wrench, socket set, bearing race and seal installer/remover (or a suitable alternative), a torque wrench, and the new wheel bearing. Consult a repair manual specific to your 2002 PT Cruiser for the exact tools and torque specifications.
3. Safety First: Always use jack stands, never rely solely on a jack. Chock the wheels to prevent rolling. Wear safety glasses.
4. Removal: Remove the wheel, caliper, rotor, and hub assembly. This often involves removing cotter pins, nuts, and potentially other components. A repair manual is essential here.
5. Bearing Removal and Installation: Use the bearing race and seal installer/remover to carefully remove the old bearing and install the new one. This is a precise step and requires care to avoid damaging the hub assembly.
6. Reassembly: Reassemble everything in reverse order of removal, paying close attention to torque specifications.
7. Test Drive: Test drive the vehicle to ensure the noise is gone and the wheel bearing operates correctly.
For any bearing other than wheel bearings, it's strongly recommended to seek professional help from a qualified mechanic. Improper repair of engine or transmission bearings can lead to catastrophic engine failure. Even wheel bearing replacement is challenging for a novice mechanic. Always consult a repair manual specific to your vehicle year and model before attempting any repair.
