Dodge Ram 50 Engine Coolant Thermostat Replacement Guide (1983-1993)
Everything you need to know about choosing and replacing the thermostat in your 1983-1993 Dodge Ram 50.
- A failing thermostat can cause overheating (stuck closed) or poor performance (stuck open).
- For this vehicle, quality aftermarket brands like Gates or Beck Arnley are excellent choices as OEM parts are scarce.
- This is a very affordable and feasible DIY repair that can prevent major engine damage.
- Always replace the thermostat gasket and ensure you purchase a part with the correct temperature rating (usually 180°F or 192°F).
The Heart of Your Ram 50's Cooling System
The engine coolant thermostat is a simple but critical component for your 1983-1993 Dodge Ram 50. Whether you have the 2.0L or 2.6L 4-cylinder engine, this part ensures your engine operates at the correct temperature. A faulty thermostat can lead to serious problems, from poor performance and bad fuel economy to catastrophic engine damage from overheating. Since this truck is a rebadged Mitsubishi Mighty Max, parts and procedures for that vehicle are identical.
Symptoms of a Failing Thermostat
A bad thermostat typically fails in one of two ways: stuck open or stuck closed. Here are the signs to watch for:
- Engine Overheating: If the temperature gauge climbs into the red, especially after the truck has been running for 10-15 minutes, the thermostat may be stuck closed. This is a serious condition that can quickly lead to engine damage. Pull over immediately if you see this.
- Engine Not Reaching Temperature: If your temperature gauge stays on cold or never reaches the normal operating range, the thermostat is likely stuck open. This can cause poor fuel economy, increased engine wear, and your heater to blow lukewarm or cold air.
- Erratic Temperature Readings: A gauge that swings wildly from hot to cold can indicate a thermostat that is sticking or opening and closing at the wrong times.
- Coolant Leaks: In some cases, a failing thermostat or its housing can cause coolant to leak. You might see puddles under the truck or notice a sweet smell after driving.
Stuck Closed is an Emergency
A thermostat that is stuck closed will not allow coolant to reach the radiator, causing the engine to overheat rapidly. If you suspect this is happening, stop driving immediately to prevent severe engine damage like a blown head gasket or warped cylinder head.
Choosing the Right Aftermarket Thermostat
For a vehicle like the 1983-1993 Ram 50, finding a new OEM thermostat from a dealer is highly unlikely. Fortunately, the aftermarket offers many quality options that meet or exceed original specifications. Since the Ram 50 is an imported Mitsubishi truck, brands specializing in import parts are often a great choice.
Brand Tiers for Your Ram 50
- Tier 1 (Recommended): Brands like Gates and Beck Arnley have a long-standing reputation for quality. Beck Arnley specializes in re-packaging OEM-quality parts for import vehicles, making them a solid bet for your Mitsubishi-built truck. Gates is a trusted name in cooling system components.
- Tier 2 (Good Value): Motorad is a widely available brand that offers good value. They manufacture thermostats for many other brands, sometimes even those in Tier 1. Motorad's "Fail-Safe" thermostats are designed to lock in the open position if they fail, which can save your engine from overheating. This is a smart feature for any vehicle.
- Tier 3 (Budget): Store brands or unbranded parts are the cheapest but carry the most risk. Given the low cost of a quality thermostat and the critical role it plays, it's wise to spend a few extra dollars on a reputable brand.
Pro Tip: Check the Temperature Rating
Most Ram 50s use a thermostat rated for 180°F or 192°F. For most climates and uses, sticking to the OEM-specified temperature is best. Using a lower temperature thermostat will not fix an overheating problem and can cause the engine to run too cool, affecting performance and emissions.
Cost of Replacing a Dodge Ram 50 Thermostat
This is one of the more affordable repairs you can make. The part itself is inexpensive, and labor is minimal.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Thermostat | $10 - $28 |
| Shop Labor | $100 - $180 (1-1.5 hours) |
| DIY Total Cost | $10 - $35 (Part + Coolant) |
| Shop Total Cost | $110 - $210 |
Frequently Asked Questions (FAQ)
Is replacing the thermostat a DIY job?
Yes, for most home mechanics with basic tools, this is a straightforward job. The thermostat is typically located where the upper radiator hose connects to the engine. The process involves partially draining the coolant, removing two or three bolts on the housing, swapping the old thermostat and gasket for the new ones, and then refilling and bleeding the air from the cooling system. It can usually be done in 1-2 hours.
Should I replace the gasket too?
Absolutely. Never reuse an old thermostat gasket. Most new thermostats come with a new gasket or rubber seal included. Ensure the mating surfaces on the engine and housing are clean before installing the new gasket to prevent leaks.
Are there any recalls or TSBs for the Ram 50 thermostat?
Our search of the National Highway Traffic Safety Administration (NHTSA) database found no recalls or specific technical service bulletins (TSBs) for engine coolant thermostat failure on the 1983-1993 Dodge Ram 50.
What's the difference between a thermostat stuck open vs. stuck closed?
A thermostat stuck closed is an emergency; it traps coolant in the engine, causing rapid overheating. A thermostat stuck open is less critical but still a problem; it over-cools the engine, leading to poor performance, bad fuel economy, and no cabin heat.
Technical Specifications
Standard Temperature: 180°F (82°C) or 192°F (89°C). Alternate temperatures may be available. Most aftermarket thermostats for this vehicle are a direct-fit, reverse poppet design and include a new gasket or seal.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Dodge Ram 50:
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- The Heart of Your Ram 50's Cooling System
- Symptoms of a Failing Thermostat
- Stuck Closed is an Emergency
- Choosing the Right Aftermarket Thermostat
- Brand Tiers for Your Ram 50
- Pro Tip: Check the Temperature Rating
- Cost of Replacing a Dodge Ram 50 Thermostat
- Frequently Asked Questions (FAQ)
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