WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: TIMING BELT TENSIONER
Courtesy of CHRYSLER LLC
1 - PLUNGER (EXTENDED POSITION)
2 - TENSIONER HOUSING
Inspect hydraulic tensioner (2)
for fluid loss around the plunger (1) seal. Replace tensioner if leaking.