Dorman Thermostat Housing Assembly for Chrysler & Dodge (Aluminum OE FIX) — Improved Durability & Coolant Flow

Dorman 902-3035HP is an aluminum thermostat housing assembly engineered to replace the original plastic water outlet on select Chrysler 300, Dodge Challenger, and Dodge Charger models for improved durability and coolant flow.

Many factory thermostat housings on these Chrysler and Dodge V6/V8 engines are plastic and can become brittle with heat cycling, eventually cracking or leaking. Dorman redesigned this assembly in aluminum with patent-pending internal improvements to better manage heat transfer and coolant routing, helping reduce the chance of future coolant loss and return visits. This assembly is sold as an OE FIX replacement and intended to fit directly in place of the factory part — always confirm fitment by entering your vehicle details in the fitment (garage) tool before ordering.

How does this aluminum housing improve reliability under the hood?

Replacing a plastic housing with a corrosion-resistant aluminum unit addresses two common failure points: material degradation from prolonged heat exposure and bleeder valve wear. The metal construction resists warping and cracking, which reduces the likelihood of sudden coolant leaks that can cause engine overheating. The upgraded design also helps maintain a consistent mating surface for a reliable seal.

• Aluminum body withstands higher underhood temperatures than the original plastic
• More consistent sealing surface reduces leak potential at the coolant outlet
• Robust construction minimizes repeat replacements and maintenance visits

What performance benefits come from the patent-pending internal design?

The internal geometry has been reworked to improve coolant circulation and heat transfer through the housing, which supports the engine’s cooling system efficiency. While it isn’t a performance-modification part, better flow dynamics can help the cooling system manage temperature spikes more effectively. These design changes were validated through product testing and engineering review.

• Optimized coolant flow paths reduce turbulence at the outlet
• Improved heat transfer characteristics compared with the original design
• Engineered and tested by Dorman product engineers in the U.S.

Will this Dorman assembly directly replace my vehicle’s original part?

This thermostat housing assembly is made to match the function and mounting points of the factory water outlet for specified model years of Chrysler 300, Dodge Challenger, and Dodge Charger. Fitment is application-specific, so input your exact trim and year into the fitment tool to confirm compatibility before purchase. If an information icon appears, hover or click it for additional notes about fitment nuances.

• Direct-fit replacement for listed model years; no major modifications expected
• Check the online garage tool for Confirmed Fit verification
• Follow vehicle-specific notes shown by the fitment icon for special cases

How should I install and maintain the new housing to avoid leaks?

Installation follows the same general steps as the original housing: drain coolant to the appropriate level, remove the old assembly, clean mating surfaces, and torque fasteners to factory specifications. Avoid over-tightening the bleeder valve and use a fresh seal or gasket if supplied. After installation, refill the cooling system and bleed air according to the vehicle manufacturer’s procedure, then inspect for leaks during a controlled warm-up.

• Use correct torque values and a new gasket or seal where applicable
• Properly bleed the cooling system to remove trapped air
• Inspect and test for leaks after reaching operating temperature

Who is this for: This Dorman 902-3035HP thermostat housing assembly is aimed at owners and technicians who want a longer-lasting replacement for the vulnerable plastic water outlet on select Chrysler 300, Dodge Challenger, and Dodge Charger vehicles. It’s appropriate for routine repairs, preventative upgrades during cooling system service, and for shops seeking an OE FIX solution that reduces the chance of repeat failures. Always verify fitment with your vehicle’s year and trim before purchasing.