The 2014 Nissan Altima uses a single thermostat to regulate engine coolant flow. There aren’t two separate thermostats in this model year’s cooling system.
Understanding the cooling system in the 2014 Altima
In both the 2.5-liter four-cylinder and the 3.5-liter V6 versions, the cooling system is designed around one thermostat that opens at a set temperature to regulate warm coolant to the radiator. The heater circuit draws from the same cooling loop, controlled by the vehicle’s climate controls, not by a separate thermostat.
Engine options and thermostat count
Both common engine options offered in the 2014 Altima share the same thermostat configuration.
- 2.5-liter inline-4 (QR25DE or its update in that generation): 1 thermostat
- 3.5-liter V6 (VQ35DE/HR): 1 thermostat
In practice, regardless of which engine the car has, the Altima’s cooling system relies on a single thermostat to regulate engine temperature.
Location and function of the thermostat
The thermostat is typically housed at the engine end of the upper radiator hose, inside the thermostat housing. It sits between the engine and radiator, opening and closing to control coolant flow as the engine warms up and operates, with the engine temperature monitored by the coolant temperature sensor and the engine control module.
Maintenance tips: if you notice symptoms of a failing thermostat (overheating, heater not warming, erratic temperature gauge), diagnosing the thermostat is a common first step, but be aware of other cooling system issues that can imitate thermostat problems.
Bottom line and what owners should know
Owners of a 2014 Altima should expect a single thermostat, regardless of whether their car has the 2.5L or the 3.5L engine. This simplification helps explain why thermostat replacement is typically a straightforward job compared with vehicles with multiple thermostats.
Summary: The 2014 Nissan Altima uses one thermostat to regulate coolant flow in the engine cooling system, for both engine options, 2.5L and 3.5L. If you're experiencing cooling issues, check the thermostat, radiator, water pump, and related hoses, but remember that thermostat count remains singular in this model year.
What is the most common problem with a 2014 Nissan Altima?
Owner Reported Trouble Spots
- Fuel System/Emissions.
- Engine Minor.
- Engine Cooling.
- Engine Electrical.
- Transmission Minor.
- Electrical Accessories.
- Noises/Leaks.
- Engine Major. Engine rebuild or replacement, cylinder head, head gasket, turbocharger or supercharger, timing chain or belt.
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How do I know if my Nissan Altima thermostat is bad?
Signs of a Bad Engine Thermostat:
- Temperature Fluctuations: One of the most common signs of a bad thermostat is erratic temperature readings on your dashboard gauge.
- Engine Overheating: An engine running hotter than usual is a red flag.
- Poor Fuel Efficiency: A faulty thermostat can lead to inefficient fuel usage.
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Do Nissan Altimas have two Thermostats?
This clips right here. This other one right here on this side then we're going to remove. This air filter housing. Two clips lift up and remove.
Does a 2014 Nissan Altima have two Thermostats?
Many 2002-2014 Nissan Altimas, especially those with the 2.5L 4-cylinder engine, are equipped with two separate thermostats (sometimes called a thermostat and a water control valve). They work together to control engine temperature.
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