Tools You'll Need:
* New AC Belt: Make sure you get the correct size belt. Your owner's manual or a parts store (providing your vehicle's VIN) can help determine this.
* Wrench(es): You'll likely need a few different sizes to loosen and tighten the belt tensioner(s). Probably 10mm, 13mm, and possibly others. Check your car's specifications.
* Socket wrench and ratchet: To make wrench use easier.
* Socket extensions: To reach some of the bolts.
* Gloves: To protect your hands.
* Jack and jack stands (highly recommended): Safely supporting your vehicle is crucial. Never work under a car supported only by a jack.
* Wheel chocks: Essential for safety.
* Shop rags or paper towels: To clean up any spills or grime.
Procedure:
1. Safety First: Park your car on a level surface, engage the parking brake, and chock the wheels. Disconnect the negative battery cable.
2. Locate the AC Belt and Components: Identify the AC belt. It's typically a smaller belt running separate from the serpentine belt. Locate the tensioner pulley (it'll have a mechanism to adjust tension). There might also be an idler pulley.
3. Release Belt Tension: This is the trickiest part. The tensioner pulley will have a bolt or a lever that needs to be loosened or depressed to release tension on the belt. This will allow you to slip the belt off the pulleys. Consult your repair manual for the correct procedure – forcing the wrong component could cause damage. Some tensioners use a bolt you loosen, some use a lever you push with a tool.
4. Remove the Old Belt: Once the tension is released, carefully slip the old AC belt off the pulleys.
5. Install the New Belt: Carefully align the new belt onto the pulleys, ensuring it's seated correctly.
6. Restore Belt Tension: Tighten the tensioner pulley (or return the lever to its original position) to restore the proper tension on the belt. You'll need to feel for the correct tension, usually described in your repair manual – you should only be able to twist the belt approximately 90 degrees. Do not over-tighten.
7. Reconnect the Battery: Reconnect the negative battery cable.
8. Check and Double-Check: Check the belt alignment and tension. Start the engine and inspect the belt for proper operation. Listen for any squealing noises that might indicate improper alignment or tension.
9. Test: Run the AC to ensure it's functioning correctly.
Important Notes:
* Repair Manual: The steps and specifics vary between vehicles. Using a repair manual specific to your 1999 Chrysler 300M is absolutely crucial.
* Tension: Too loose, and the belt will slip and squeal. Too tight, and the belt will wear out prematurely or damage the bearings in the pulleys.
* Professional Help: If you're uncomfortable with any part of this process, take your car to a qualified mechanic. Improper belt replacement can lead to further damage.
By following these steps and consulting your repair manual, you should be able to replace your AC belt successfully. Remember, safety first! If you are unsure about any step, seek professional help.
