Dodge W150 Engine Coolant Thermostat: A Guide for 1982-1993 Models
Your guide to solving overheating or running-cold issues in your classic Dodge W150 truck.
- For a stock W150, choose a standard 195°F thermostat from a reputable brand like Calorstat, Gates, or Motorad.
- Avoid 'performance' or low-temperature thermostats unless your engine is heavily modified.
- Symptoms include overheating (stuck closed) or running cold with no heat (stuck open).
- This is a very easy and inexpensive DIY job that most owners can do in under an hour.
Is Your W150's Thermostat Failing?
A bad thermostat can cause problems that look serious, but the fix is usually simple and cheap. On these classic Dodge trucks, the thermostat can fail in two ways: it gets stuck open or stuck closed. Both cause distinct symptoms.
Symptoms of a Stuck-Closed Thermostat:
- Engine Overheats: The temperature gauge will climb into the red. This is the most serious symptom. If the thermostat is stuck shut, coolant can't get to the radiator to cool down.
- Coolant Boiling or Leaking: Extreme heat and pressure can cause coolant to boil in the engine or leak from the radiator cap or weak points in hoses.
Symptoms of a Stuck-Open Thermostat:
- Engine Never Warms Up: The temperature gauge stays on cold or only moves up slightly, even after driving for a while.
- Poor Heater Performance: Your cab heater blows lukewarm or cold air because the engine coolant never gets hot enough.
- Worse Fuel Economy: An engine that runs too cold is inefficient and will use more fuel.
Choosing the Right Aftermarket Thermostat
For a 1982-1993 Dodge W150, you don't need to hunt down a rare, expensive OEM part. The aftermarket offers excellent options that meet or exceed the original quality. The most important factor is choosing the correct temperature rating. For most stock V8 and Slant-6 engines in these trucks, a 195°F thermostat is the standard. Using a lower temperature thermostat is generally not recommended for a daily-driven, stock engine.
Brand Quality Tiers
Based on owner reviews and brand reputation, here's how the available brands generally stack up for your W150:
- Premium Aftermarket (Good Reputation): Calorstat is a well-regarded brand, often cited as an OEM supplier for various carmakers. It's known for quality and reliability.
- Standard Replacement (Reliable Choices): Gates and Motorad are go-to standard replacement brands. They are widely available and offer a good balance of price and reliability for daily driving. Interestingly, many sources indicate that other brands, including Gates at times, are manufactured by Motorad.
- Performance-Focused (Use With Caution): Edelbrock, Mr. Gasket, and Mishimoto are performance brands. Only choose these if you specifically need a lower temperature rating for a modified engine. Be aware that some users report inconsistent quality or premature failures with some performance-branded thermostats.
Cost of a New Engine Coolant Thermostat
Replacing the thermostat on a 1982-1993 W150 is one of the most affordable repairs you can do. The part itself is inexpensive, and labor is minimal.
| Part or Service | Estimated Cost |
|---|---|
| New Aftermarket Thermostat | $8 - $56 |
| Shop Labor | $75 - $150 |
| DIY Total (Part + Coolant) | $25 - $75 |
Frequently Asked Questions (FAQ)
Can I replace the thermostat myself?
Yes, absolutely. Replacing the thermostat on a W150 is a classic beginner-level job. It typically requires only basic hand tools, a drain pan, and some fresh coolant. The thermostat is usually located at the front of the engine where the upper radiator hose connects.
What temperature thermostat should I use for my W150?
For a stock engine, use the OEM-specified temperature, which is typically 195°F. This ensures the engine warms up properly and runs efficiently. Only use a lower-temperature thermostat (like 180°F) if you have a highly modified engine and are trying to manage extra heat.
Should I replace the gasket too?
Yes, always use a new gasket when replacing the thermostat. Many thermostats come with a new gasket in the box. If not, buy one separately. You should also clean the thermostat housing and engine surfaces thoroughly before installing the new gasket to ensure a good seal.
Were there any recalls for the W150 thermostat?
No. Searches of the NHTSA database and other records show no recalls or common Technical Service Bulletins (TSBs) for the engine coolant thermostat on the 1982-1993 Dodge W150.
Technical Specifications
The most critical specification is the temperature rating. The standard for most 1982-1993 Dodge W150 models is 195°F (90°C). Always verify the correct temperature for your specific engine (Slant-6, 318 V8, 360 V8).
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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.
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