Dodge 600 Engine Coolant Thermostat Replacement Guide (1983-1988)
Solve overheating or no-heat problems in your classic Dodge 600 by choosing the right thermostat.
- Overheating can also be caused by a failed head gasket, a known issue on 2.2L/2.5L engines.
- Drilling a small 1/16-inch bleed hole in the new thermostat flange helps prevent air pockets during coolant refills.
- Choose a quality aftermarket brand like Gates or Calorstat over economy brands for better reliability.
- Always replace the thermostat gasket at the same time to ensure a leak-free seal.
Is Your Dodge 600 Thermostat Failing?
A thermostat is a simple part, but a failure can cause serious problems. On a 1983-1988 Dodge 600, these parts are well past their original service life and should be inspected. A thermostat can fail in two ways: stuck open or stuck closed. Each has clear symptoms.
Symptoms of a Bad Thermostat
- Engine Overheats: This is the most dangerous symptom. If the thermostat is stuck closed, it traps coolant in the engine, preventing it from reaching the radiator. The temperature gauge will quickly climb into the red. Pull over immediately to prevent severe engine damage.
- No Heat in the Cabin: If your thermostat is stuck open, coolant constantly flows through the radiator. This prevents the engine from ever reaching full operating temperature, especially in cold weather. You will notice the temperature gauge stays low and your heater blows lukewarm or cold air.
- Temperature Gauge Fluctuates: A thermostat that is sticking or slow to respond can cause the temperature needle to swing up and down unpredictably.
Warning: Check for Head Gasket Failure
The 2.2L and 2.5L Chrysler engines of this era were known to have issues with head gaskets. A failing head gasket can force hot exhaust gas into the cooling system, creating air pockets and causing overheating symptoms that look exactly like a stuck-closed thermostat. If you replace your thermostat and the car still overheats, a bad head gasket is a very likely cause.
Choosing the Right Aftermarket Thermostat
For a vehicle of this age, new OEM Mopar parts are generally not available. The aftermarket is your only realistic option. Quality varies, so it's important to choose a reliable brand, even for a simple part.
| Brand Tier | Brands | Our Assessment |
|---|---|---|
| Better Quality | Gates, Calorstat | Gates is a well-respected name in cooling systems. Calorstat is often an OEM supplier for European cars and has excellent user reviews for reliability. These are solid choices for peace of mind. |
| Standard / Economy | Motorad, Beck Arnley | Motorad is a huge manufacturer that even makes some OEM parts, but their aftermarket line has a mixed reputation among car enthusiasts, with some calling it poor quality. Beck Arnley often re-boxes parts from other manufacturers; you might even find a Motorad thermostat in a Beck Arnley box. These parts will work, but may have a shorter lifespan. |
Typical Replacement Costs
Replacing the thermostat on a Dodge 600 is an inexpensive repair, whether you do it yourself or take it to a shop.
| Part or Service | Estimated Cost |
|---|---|
| New Aftermarket Thermostat | $9.85 - $26.86 |
| Shop Labor | $75 - $150 |
| Total Professional Repair | $85 - $177 |
Pro Tip: Bleed the Cooling System Properly
The Chrysler 2.2L and 2.5L engines can be difficult to bleed air from the cooling system after a repair. Trapped air can cause an air pocket that prevents coolant from circulating, leading to overheating. Many experienced mechanics recommend drilling a tiny 1/16-inch hole in the flange of the new thermostat before installing it. This allows trapped air to escape, making the system much easier to refill correctly.
Frequently Asked Questions
Can I replace the Dodge 600 thermostat myself?
Yes, this is a great DIY job for beginners. The thermostat is easy to access on the 2.2L and 2.5L engines. The process involves partially draining the coolant, removing the upper radiator hose from the housing, unbolting two bolts, swapping the part and its gasket, and then refilling and bleeding the system. The hardest part is often just breaking the old hose free from the housing.
What temperature thermostat do I need for my Dodge 600?
For the common 2.2L and 2.5L engines, the correct OEM-specified temperature is 192°F. Using a thermostat with a different temperature rating can affect engine performance and heater operation.
Should I replace anything else with the thermostat?
Yes. Always replace the thermostat gasket to prevent leaks. It's also a perfect time to inspect the upper and lower radiator hoses. If they feel soft, swollen, or brittle, replace them now to prevent a future failure. Consider a full cooling system flush if the coolant looks rusty or has debris in it.
Are there any recalls for the thermostat on this car?
No. Searches of the NHTSA database show no recalls or major Technical Service Bulletins (TSBs) related to the engine coolant thermostat for the 1983-1988 Dodge 600. Any failure is considered a standard wear-and-tear repair.
Technical Specifications
Required Temperature: 192°F (for 2.2L & 2.5L engines)
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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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