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How to Replace the Belts on a 1999 Chrysler 300M

The 1999 Chrysler 300M has two different belts that travel around the accessory pulleys. The first belt is a drive belt that controls the air conditioner compressor. The second belt is a serpentine belt that controls the remaining accessories such as the alternator, power steering pump and the water pump. Both belts are routed around each designated accessory pulley in a method that allows the accessories to function from the same belt. Both the drive belt and the serpentine belt are tensioned by an adjustable idler pulley. If the belts develop any visible fraying, change them out immediately.

Instructions

1

Open the hood and prop it in place to prevent it from falling.

2

Locate the serpentine belt adjustable idler pulley that tensions the serpentine belt on the front of the engine. This adjustable idler pulley will be closest to the top side of the engine. Position a metric socket onto the ratchet and loosen the bolt in the center of the serpentine belt idler pulley.

3

Remove the socket from the ratchet and a both of the 8-inch extensions to the ratchet. Put the socket back onto the bottom of the extension. Move to the underside of the engine and locate the adjustment bolt on the bottom of the serpentine belt idler pulley. Position the ratchet, extension and socket onto the adjustment bolt. Turn the adjustment bolt a couple of turns to loosen the serpentine belt. Remove the belt from all of the accessory pulleys and out of the engine well.

4

Remove the air conditioner compressor belt from the bottom side of the engine also. Locate the adjustable idler pulley for the air conditioner compressor belt on the lower front passenger side of the engine. Loosen the bolt in the center of the adjustable idler pulley with the ratchet and a socket. Remove the socket and position the extensions back onto the ratchet and push the socket back onto the bottom extension.

5

Turn the adjustment bolt on the bottom of the adjustable idler pulley counter clockwise a couple of times with the ratchet, extensions and socket. Pull the belt off of the air conditioner compressor pulley and the other pulleys.

6

Route the new air conditioner belt around the same pulleys including the adjustable idler pulley. Tighten the belt by turning the bolt on the bottom of the adjustable pulley clockwise until the belt is tight. Check the belt tension by pushing inward on the belt. The belt should have no more than a half-inch of free play to be properly tensioned. If the belt is too tight or too loose, adjust as needed. Once the belt is properly tightened, tighten the bolt down tight in the center of the adjustable idler pulley.

7

Route the new serpentine belt around all of the accessory pulleys including around the adjustable idler pulley. Tighten the serpentine belt by turning the bolt on the bottom of the adjustable pulley clockwise until the belt is tight. Check the belt tension by pushing inward on the belt. The belt should have no more than a half-inch of free play to be properly tensioned. If the belt is too tight or too loose, adjust as needed. Once the belt is properly tightened, tighten the bolt down tight in the center of the adjustable idler pulley.

8

Crank the 1999 Chrysler 300M for about fifteen seconds. Turn the motor off and recheck the tension of both belts. If the belts are too tight or too loose, adjust the tension as needed to reach the required half-inch of free play