Dodge Ramcharger 1982-1994 Engine Coolant Thermostat Replacement Guide
Everything you need to know about choosing the right new thermostat for your Ramcharger's V8 engine.
- A bad thermostat can cause your Ramcharger to either overheat (stuck closed) or run too cold (stuck open).
- Replacing the thermostat is an easy, DIY-friendly job on the 318 and 360 V8 engines.
- Always use a new gasket and position the thermostat's bleeder pin at the top to prevent air pockets.
- For most users, a standard 195°F thermostat is the best choice; lower temperature models are available for performance use but may impact heater function.
Symptoms of a Bad Thermostat in a Ramcharger
A thermostat can fail in two ways: stuck open or stuck closed. The symptoms are very different for each failure. Recognizing them early can save you from bigger headaches.
- Engine Overheating: This is the most serious symptom. If the thermostat is stuck closed, it won't allow coolant to flow to the radiator. Your temperature gauge will climb into the red, and you may see steam or hear boiling sounds. This can cause severe engine damage if you continue to drive.
- Engine Runs Too Cold: If the thermostat is stuck open, it allows coolant to circulate constantly, even when the engine is cold. Your temperature gauge may never reach the normal operating range, or it might take a very long time to warm up. You may also get a check engine light with code P0128.
- Poor Heater Performance: Your truck's cabin heater uses hot coolant to warm the air. If the engine isn't getting hot enough because the thermostat is stuck open, your heater will only blow lukewarm air.
- Erratic Temperature Gauge: A failing thermostat can cause the temperature gauge to swing back and forth unpredictably. It might jump up to hot and then quickly fall back to normal.
- Coolant Leaks: A stuck-closed thermostat can cause extreme pressure buildup in the cooling system, potentially forcing coolant out of the thermostat housing gasket or other weak points.
Choosing the Right Aftermarket Thermostat
For a vehicle like the 1982-1994 Ramcharger, the aftermarket is your main source for a new thermostat. Original Mopar parts are scarce. Aftermarket brands offer a range of quality and performance, from standard replacements to high-flow units.
Aftermarket Brand Tiers
| Tier | Brands | Quality & Performance Notes |
|---|---|---|
| High-Performance | Mishimoto | Often sold as a 'racing' thermostat, Mishimoto has positive reviews for quality construction and helping to keep modified or hard-working engines cooler. They are a good choice if you live in a hot climate or use your Ramcharger for towing. |
| Performance / Value | Mr. Gasket | Mr. Gasket offers 'high-flow' thermostats, often with a copper and brass construction to resist corrosion. Reviews are mixed; some owners have great success with them, while others report early failures. They can be a good performance value, but there is a risk of getting a bad part. |
| Standard Replacement | Gates, Motorad, Calorstat | These brands are the workhorses of the aftermarket. They are designed to meet or exceed original specifications for fit and function. For a daily-driven Ramcharger with a stock engine, a standard replacement thermostat from a reputable brand like Gates or Motorad is a reliable and cost-effective choice. |
What Temperature Rating Do I Need?
The factory-spec thermostat for the Ramcharger's 318 and 360 V8 engines is typically 195°F. For most owners, this is the best choice for all-around performance and heater function. Performance brands offer lower temperature options like 180°F or even 160°F. A 180°F thermostat can help an engine run slightly cooler, which may be beneficial for performance or in hot climates, but it can also reduce heater effectiveness in the winter. A 160°F thermostat is generally considered for race applications only.
Frequently Asked Questions (FAQ)
Is replacing the thermostat a DIY job on a Ramcharger?
Yes, for most owners with basic hand tools. The thermostat is located at the front of the engine where the upper radiator hose connects. The process involves draining some coolant, removing two bolts, swapping the part, and refilling. It's considered a simple job on these older V8 engines.
Do I have to replace the thermostat gasket?
Absolutely. Never reuse the old gasket. A new gasket is cheap and essential for preventing leaks. Most new thermostats come with a gasket, but always double-check. You may also need a small amount of RTV sealant depending on the gasket type.
What is the little 'jiggle pin' on the thermostat?
That small pin or hole is a bleeder valve. It allows trapped air to escape from the cooling system. When you install the new thermostat, make sure this pin is facing up (at the 12 o'clock position) to let air bubbles pass through.
Can I test my old thermostat to see if it's bad?
You can, but it's often not worth the effort. The test involves suspending the thermostat in a pot of water with a thermometer and heating it to see if it opens at the correct temperature. Given the low cost of a new thermostat, if you've already done the work to remove it, it's best to just install a new one.
Technical Specifications
Fits Dodge 318 & 360 LA-series V8 engines. Common temperature ratings are 195°F (stock), 180°F (performance), and 160°F (race).
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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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