If you've noticed a rattle or knock from under the hood on your Chrysler 300, Dodge Challenger, Charger, or Magnum — especially over bumps or at idle — a worn upper radiator isolator is a common cause. This small rubber mount secures the top of the cooling module (radiator, condenser, and fan shroud assembly) to the vehicle's frame rails, and once it breaks down, the whole cooling module can shift and vibrate against surrounding components.
Why Genuine OEM Matters
The upper radiator isolator does more than fill a gap — it's a precisely engineered rubber bushing that absorbs engine and road vibration while keeping the cooling module locked in its correct position. A genuine Mopar isolator matches the factory rubber compound and dimensions exactly, so the cooling module sits where it's supposed to and doesn't rattle, sag, or crowd the fan blades. Generic replacements can be softer, harder, or slightly off in size, which can lead to a recurring rattle, uneven cooling module alignment, or premature wear on nearby components. Replacing the isolator with a genuine part is the most reliable way to put the noise to rest for good.
Fitment
- 2005-2023 Chrysler 300 — 3.5L V6, 3.6L V6, 5.7L V8, 6.4L V8
- 2005-2023 Dodge Challenger — 3.5L V6, 3.6L V6, 5.7L V8, 6.1L V8, 6.2L V8, 6.4L V8
- 2005-2023 Dodge Charger — 3.5L V6, 3.6L V6, 5.7L V8, 6.1L V8, 6.2L V8, 6.4L V8
- 2005-2023 Dodge Magnum — 2.7L V6, 3.5L V6, 5.7L V8, 6.1L V8
Covers R/T, Road & Track, Yellow Jacket, 392 Hemi Shaker, and 100th Anniversary Edition trims, including Max AWD and Plus AWD configurations. This is the upper mounting position, genuine OEM Mopar.
Get the Right Part the First Time
Skip the guesswork and the dealership markup. Conquest Auto Parts stocks the genuine OEM upper radiator isolator ready to ship.
Shop the 05-23 Chrysler 300 Dodge Challenger Charger Upper Radiator Isolator OEM