Engine Coolant Thermostat Guide for the 1983-1984 Chrysler E Class
Keep your classic Chrysler's engine running at the perfect temperature by choosing and installing the right thermostat.
- A stuck-closed thermostat will cause rapid overheating; pull over immediately to prevent engine damage.
- For 2.2L engines, it is highly recommended to drill a small 1/16-inch bleed hole in the new thermostat's flange to prevent air pockets.
- Always replace the thermostat gasket to ensure a leak-free seal.
- If overheating continues after replacement, suspect a more serious issue like a failed head gasket, a known problem on 2.2L engines.
Is Your E Class Thermostat Failing?
On a classic vehicle like the 1983-1984 Chrysler E Class, the thermostat is a common failure point. Decades of heat cycles wear out the wax element and spring. A thermostat can fail in two ways: stuck open or stuck closed, and you need to know the signs for each.
Symptoms of a Bad Thermostat
- Engine Overheating: 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 climb into the red zone, which can cause severe engine damage like warped cylinder heads.
- Engine Runs Too Cool: If the thermostat is stuck open, coolant constantly circulates through the radiator. The engine will take a very long time to warm up, or may never reach its proper operating temperature. This leads to poor fuel mileage, increased engine wear, and a heater that doesn't blow hot air.
- Erratic Temperature Gauge: The temperature gauge may swing wildly between hot and cold. This often indicates the thermostat is sticking intermittently before it fails completely.
A Note on 2.2L Engine Overheating
The 2.2L Chrysler engine, common in the E Class, had a known weakness with head gaskets. A failing head gasket can force combustion gases into the cooling system, causing overheating symptoms identical to a stuck thermostat. If you replace the thermostat and the overheating persists, a head gasket issue is a strong possibility and should be investigated by a mechanic.
Choosing the Right Aftermarket Thermostat
Since Original Equipment (OEM) thermostats for the E Class are no longer produced, you will be choosing from aftermarket brands. For a critical, inexpensive part like this, quality matters more than price.
Brand Tiers
- Tier 1 (Recommended): Brands like Gates and Calorstat have a long-standing reputation for producing reliable cooling system components. They are considered a safe bet for quality and proper operation.
- Tier 2 (Use with Caution): Motorad is a massive manufacturer that also produces parts for other brands, but their own branded parts have a mixed reputation in enthusiast forums, with some reporting premature failures. Beck Arnley often re-boxes parts from other manufacturers, so the quality can be inconsistent; you might get a high-quality part or a lower-grade one.
Pro Tip: Drill a Bleed Hole for 2.2L Engines
The Chrysler 2.2L engine is notorious for trapping air in the cooling system during a refill. This air pocket can sit at the thermostat, preventing hot coolant from reaching it, which means it won't open. The result is an overheating engine even with a brand-new thermostat. Experienced mechanics strongly recommend drilling a tiny 1/16-inch to 1/8-inch hole in the flange of the new thermostat before installation. This allows trapped air to bleed past the valve, ensuring it functions correctly.
Cost of Replacing a Chrysler E Class Thermostat
Replacing the thermostat is one of the more affordable repairs you can perform. The part itself is inexpensive, and labor is minimal due to its easy accessibility on both the 2.2L and 2.6L engines.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Thermostat | $9.85 - $26.86 |
| Shop Labor | $90 - $150 |
| Total Professional Replacement | $100 - $177 |
Frequently Asked Questions (FAQ)
What temperature thermostat should I use?
You should always use the OEM-specified temperature, which is typically 195°F for the Chrysler E Class. Using a cooler thermostat will not solve an overheating problem and will hurt your engine's efficiency and performance.
Do I have to replace the gasket too?
Yes, absolutely. Never reuse the old thermostat housing gasket. A new gasket is essential to prevent coolant leaks and is often included with the new thermostat. If not, purchase one separately.
Is this a good DIY job?
Yes, this is a great job for a beginner or DIY mechanic. It requires only basic hand tools, is not complex, and can be completed in under an hour. The thermostat housing is easy to access on top of the engine where the upper radiator hose connects.
Are there any recalls for the thermostat?
No, there have been no recalls or major Technical Service Bulletins (TSBs) issued for the engine coolant thermostat on the 1983-1984 Chrysler E Class. Any failure today is due to the age of the part.
Technical Specifications
Standard Temperature: 195°F (90.5°C)
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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.
- Chrysler E Class:
- 🛍️ Shop This Part
- Is Your E Class Thermostat Failing?
- Symptoms of a Bad Thermostat
- A Note on 2.2L Engine Overheating
- Choosing the Right Aftermarket Thermostat
- Brand Tiers
- Pro Tip: Drill a Bleed Hole for 2.2L Engines
- Cost of Replacing a Chrysler E Class Thermostat
- Frequently Asked Questions (FAQ)
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