Allmotorparts Thermostat for Chrysler Dodge Jeep Ram Hemi 5.7–6.4L — 203°F, includes gasket

Allmotorparts 203℉ replacement thermostat for Hemi 5.7L–6.4L engines controls coolant flow to stabilize engine temperature until proper operating heat is reached.

If your Chrysler, Dodge, Jeep or Ram with a Hemi V8 is showing erratic temperature readings, running too cool or overheating, the thermostat is a common service item. This aftermarket Allmotorparts unit replaces OEM part 52028898AE and includes the gasket. It is designed to fit many 5.7L, 6.1L, 6.2L and 6.4L Hemi applications across model years listed below — but always verify fitment to your VIN and engine code before ordering.

How will this thermostat affect my engine’s temperature behavior?

The thermostat opens and closes to direct coolant either through the engine or to the radiator, helping the engine reach and keep the intended operating temperature. A properly functioning 203℉ thermostat prevents prolonged cold operation and reduces the risk of overheating once the engine is warm.

• Opens at approximately 203℉ for consistent operating range.
• Closes when cold to speed warm-up and lower emissions.
• Reduces temperature swings that can cause poor performance or drivability issues.

Which vehicles and engines is this thermostat compatible with?

This Allmotorparts thermostat is built for Hemi V8 engines in many Chrysler, Dodge, Jeep and Ram models. Compatibility covers 5.7L, 6.1L, 6.2L and 6.4L engines across multiple model years listed in the product details.

• Chrysler: 2005–2023 300, 2007–2009 Aspen.
• Dodge: Challenger, Charger, Durango, Magnum, Ram 1500/2500/3500/4000 across mid 2000s–2023 ranges.
• Jeep/Ram: Grand Cherokee, Commander, Wagoneer, Wrangler, and Ram 1500/2500/3500/4000 variants as specified.

What are the construction and fitment details I should know?

This aftermarket replacement is made to match OE form and function with durable materials and a stainless steel mounting flange. The design includes a robust spring frame and ships with a gasket for installation.

• Replaces factory part number 52028898AE at 203℉ rating.
• Stainless steel flange and reinforced spring frame for wear resistance.
• Includes gasket; check jiggle pin orientation for vertical installation (12 o'clock position).

How do I spot a failing thermostat and what should I do?

Common signs include consistent overheating, unusually low temperature readings, or thermostat housing leaks. If you notice temperature swings or coolant pooling near the housing, replace the thermostat and gasket promptly to avoid further engine stress.

• Watch for high temp gauge readings or frequent overheating.
• Low or slow-to-rise temperature gauge suggests a stuck-open thermostat.
• Inspect for coolant leaks around the thermostat housing or under the vehicle.

Who is this for: Technicians, DIY mechanics and Hemi owners who need a direct-fit aftermarket replacement for the OE 203℉ thermostat. Ideal for anyone maintaining or repairing Chrysler 300, Dodge Challenger/Charger/Durango, Jeep Grand Cherokee/Wagoneer, and Ram trucks equipped with 5.7L–6.4L Hemi engines. Confirm compatibility with your vehicle’s year, model and engine option before purchase. Note: this is an aftermarket Allmotorparts product, not a factory genuine Mopar part.