Engine Coolant Thermostat Guide for 2012-2020 Dodge Grand Caravan
Dealing with a P0128 code or poor heat? Your Grand Caravan's thermostat is the likely culprit.
- A P0128 check engine light code is the most common sign of a failed, stuck-open thermostat.
- The thermostat is sold as a complete housing assembly and is an easy DIY replacement, located on the passenger side of the engine.
- Always bleed the air from the system after replacement using the bleeder screw on the housing and a spill-proof funnel.
- Use the correct Mopar MS-12106 OAT coolant to avoid system damage.
Is Your Grand Caravan's Thermostat Failing?
A bad thermostat in the 3.6L Pentastar engine is a common issue. The most frequent sign of failure is the check engine light with a P0128 - Coolant Temperature Below Thermostat Regulating Temperature code. This usually means the thermostat is stuck open. When this happens, the engine takes too long to warm up, especially in colder weather.
Other symptoms include:
- Poor heater performance: If the engine can't get up to temperature, the heater won't blow hot air.
- Temperature gauge lower than normal: The needle may stay below the halfway mark even after driving for a while.
- Engine overheating: Less commonly, the thermostat can fail stuck-closed. This is a serious problem that will cause the engine to overheat quickly, as coolant cannot get to the radiator.
- Coolant leaks: The thermostat is housed in a plastic assembly that can crack over time, leading to visible coolant leaks near the passenger side of the engine.
Choosing the Right Aftermarket Thermostat
For the 2012-2020 Grand Caravan, the thermostat is sold as a complete assembly with the plastic housing. While some owners prefer to stick with the OEM Mopar part, quality aftermarket options provide a reliable repair at a lower cost.
Pro Tip: Some owners report repeat failures of aftermarket thermostats. While brands like Gates and Motorad are generally considered reliable in the industry, quality can vary. If you want the most peace of mind, an OEM part may be worth the extra cost, but a quality aftermarket part is usually sufficient.
Brand Quality Tiers
- Gates: A well-known brand that produces a wide range of automotive parts. Their thermostats are generally considered a solid OE-quality equivalent.
- Motorad: Another major manufacturer that supplies parts to many brands. They offer a cost-effective option that meets OE specifications.
Known Issues & Recalls
There are no specific recalls or Technical Service Bulletins (TSBs) from Dodge or the NHTSA for the thermostat itself on the 2012-2020 Grand Caravan. However, the 3.6L Pentastar engine is known for cooling system issues, including problems with the radiator and oil filter housing, which can sometimes be misdiagnosed. A TSB (R62) was issued for some 2014-2015 models for an HVAC blend door issue that could affect temperature control inside the cabin, but this is unrelated to the engine thermostat's function.
Cost of Replacing a Dodge Grand Caravan Thermostat
The cost depends on whether you do the job yourself or take it to a shop. The part itself is affordable, and the job is straightforward for a DIYer with basic tools.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Thermostat Assembly | $21.57 - $49.94 |
| New OEM (Mopar) Thermostat Assembly | $70 - $100 |
| Shop Labor | $100 - $200 |
| Total Professional Replacement | $120 - $300 |
Frequently Asked Questions
Is it hard to replace the thermostat on a Grand Caravan?
No, it is considered an easy repair. It is located on the passenger side of the engine and is held on by two 10mm bolts. The main steps involve partially draining the coolant, removing the air filter box for better access, swapping the thermostat housing, and then refilling and bleeding the air from the cooling system. The entire job can typically be done in under 2 hours.
🎬 Watch: How to replace the thermostat and bleed the systemDo I need to drain all the coolant to change the thermostat?
You don't have to drain the entire system from the radiator petcock. You can place a catch pan underneath and expect to lose about half a gallon of coolant when you remove the housing. However, for a cleaner job, draining from the radiator is recommended. Always use a spill-proof funnel to refill and bleed the system to prevent air pockets.
What is the bleeder screw on the thermostat housing for?
The small screw on top of the new thermostat housing is an air bleeder valve. When you are refilling the coolant, you should loosen this screw until a steady stream of coolant comes out, which indicates the air has been purged from that part of the system. Then you tighten it before starting the engine to complete the bleeding process.
🎬 Watch how to properly bleed air from the Pentastar cooling systemWhat kind of coolant should I use for my 2012-2020 Grand Caravan?
Your Grand Caravan requires an OAT (Organic Acid Technology) coolant that meets Mopar specification MS-12106. This is typically a purple-colored coolant. Using the wrong type can cause damage to the cooling system. Always top off or refill with the correct type of coolant.
Helpful Videos
Technical Specifications
OEM Part Numbers: 4573560AB
The thermostat for the 2012-2020 Dodge Grand Caravan is an integrated housing assembly with a specified opening temperature of 203°F (95°C). It includes the thermostat, housing, and seal as a single bolt-on unit.
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.
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