A Guide to the Engine Coolant Thermostat for the 2011-2018 Volvo S60
Keep your Volvo S60's engine temperature in check by understanding the signs of a failing thermostat.
- The most common failure is the thermostat sticking open, causing a P0128 check engine light code.
- You must replace the entire thermostat and housing assembly, not just the thermostat itself.
- Choosing an OEM or high-quality OEM supplier brand like Mahle, Wahler, or Calorstat is highly recommended to avoid premature leaks.
- Replacement is moderately difficult and may require moving the power steering pump or removing the intake manifold depending on the engine.
Is Your S60's Thermostat Failing?
A faulty thermostat can cause serious engine problems. It typically fails in one of two ways: stuck open or stuck closed. If it's stuck closed, your engine will overheat. If it's stuck open, your engine will take a very long time to warm up, or may never reach the proper temperature, especially in cold weather. This can trigger a check engine light.
Common Failure Symptoms
🎬 Watch: 7 common symptoms of a bad or failing thermostat- Check Engine Light: A common sign is the check engine light with code P0128, which means the engine coolant temperature is below the normal regulating temperature. This usually happens when the thermostat is stuck open.
- Temperature Gauge Issues: The temperature gauge on your dashboard may show erratic readings, swinging from cool to hot, or it may stay on cold for an unusually long time.
- Engine Overheating: If the thermostat is stuck closed, coolant can't get to the radiator to be cooled, causing the engine to overheat quickly.
- Poor Heater Performance: If the thermostat is stuck open, the engine may not get hot enough to provide warm air to the cabin heater.
- Coolant Leaks: The thermostat housing is made of plastic and can crack with age, leading to coolant leaks around the thermostat area.
Known Issues & Recalls
While there are no direct recalls for the thermostat itself on the 2011-2018 S60, Volvo has issued recalls for related cooling system components. Recall R29936 was issued for some 2016 models for a coolant bleeder hose that could crack and leak, posing a fire risk. Other recalls for 2011-2016 models also mention coolant leaks that could potentially lead to an engine bay fire. It is critical to address any coolant leak, regardless of the source.
Choosing the Right Aftermarket Thermostat
For most 2011-2018 Volvo S60 engines, you must replace the entire thermostat housing assembly 🎬 See this housing replacement overview for T6 and 3.2 engines, which includes the thermostat, the plastic housing, and often a new temperature sensor. You cannot typically buy just the thermostat itself. Given the plastic construction and the labor involved, choosing a quality part is important.
Brand Quality Tiers
- Tier 1: OEM & OEM Suppliers (Recommended): Brands like Genuine Volvo, Mahle, and Wahler are trusted suppliers that meet original equipment specifications. Calorstat by Vernet is another well-regarded brand known for making quality thermostats. These are your best bet for long-term reliability.
- Tier 2: Reputable Aftermarket: Brands like Gates and Motorad offer reliable products that are a good balance of price and quality.
- Tier 3: Economy Brands: While brands like Professional Parts Sweden or other lower-cost options are available, some owners have reported issues like premature leaking. Given the importance of the part and the labor to replace it, saving a few dollars here might lead to more costs later.
Pro Tip: When replacing your thermostat, it's also a good time to inspect your coolant hoses and flush the cooling system. Use the correct Volvo-spec coolant (blue or yellow, depending on the year and what is currently in the system) and do not mix coolant types.
Replacement Cost
The cost to replace the thermostat on a 2011-2018 S60 can vary based on your engine and who does the work.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Thermostat Assembly | $45 - $150 |
| New OEM Thermostat Assembly | $150 - $250 |
| Shop Labor | $200 - $450 |
| Total Professional Replacement | $245 - $700 |
Frequently Asked Questions
Can I replace just the thermostat and not the whole housing?
For most S60 models in this year range, no. The thermostat is integrated into the plastic housing and is not sold separately with a new gasket. You must replace the complete assembly.
How difficult is it to replace the thermostat myself?
It depends on your engine. For 5-cylinder models, the power steering pump often needs to be moved to access the housing. For the 4-cylinder 2.0L engines, the intake manifold may need to be removed. 🎬 Watch: DIY walkthrough for 2015-2019 water pump and thermostat replacement It is a moderately difficult job for a DIYer that requires specific tools (like Torx bits) and patience.
What is the P0128 error code?
P0128 means "Coolant Temperature Below Thermostat Regulating Temperature." Your car's computer expects the engine to warm up within a certain time. If the thermostat is stuck open, the engine stays too cool for too long, triggering this code. Replacing the thermostat assembly is the most common fix.
What coolant should I use for my Volvo S60?
Always use a Volvo-specific coolant. Volvo has used both blue (G48 type) and yellow (VCS type) coolants. They should not be mixed. Check your owner's manual or the color of the coolant in your expansion tank to be sure. When in doubt, purchase coolant from a Volvo dealer.
Helpful Videos
Technical Specifications
OEM Part Numbers: 31355151 LR006071 31293700 31319608
Most thermostats for this application are sold as a complete plastic housing assembly with an integrated thermostat and sometimes a coolant temperature sensor. Opening temperatures are typically 90°C (194-195°F).
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.
- Volvo S60: