Thermostat housings used OE

Thermostat housings used OE

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Car Thermostat Housings

The thermostat housing is a crucial component within your car's cooling system, primarily responsible for securely holding the engine's thermostat. It also plays a vital role in regulating coolant temperature and directing its flow between the engine and radiator, ensuring the engine maintains its ideal operating temperature.

Crafted from robust materials, this durable housing typically:

  • uses materials like plastic or metal,

  • can be a standalone unit,

  • incorporates additional elements such as seals and sensors in some designs,

  • connects directly to the engine block,

  • serves as the attachment point for the coolant hoses.

How does a thermostat housing work in the engine cooling system?

Housed within a component connecting the coolant hoses, the thermostat is crucial for managing coolant flow and engine temperature.

When the engine is cold, the thermostat remains shut, directing coolant to bypass the radiator. This confines circulation to the engine block, enabling a quicker warm-up, boosting efficiency, and reducing emissions.

Once the engine reaches its optimal temperature, the thermostat's wax element melts, opening a valve. This directs hot coolant through the top hose to the radiator for essential cooling.

The cooled fluid then flows back to the engine via the bottom radiator hose, where the water pump propels it, ensuring continuous circulation and preventing engine overheating.

What is the interaction between the thermostat and its housing?

The thermostat's housing provides a meticulously designed structure, enabling its sensing element to accurately detect coolant temperature. This stable environment is essential for effectively regulating coolant flow.

Crucially, a gasket or seal forms a protective barrier, nestled between the housing and the engine block. This component is vital for preventing coolant leaks. Modern vehicles increasingly feature integrated designs, where the thermostat, its housing, and associated sensors are often combined into a single, pre-assembled unit.

What causes thermostat housing leaks?

Thermostat housings are a frequent cause of coolant leaks, primarily due to material degradation, a compromised seal, or improper installation. Over time, plastic versions can become brittle and crack from repeated engine heat cycles. Even metal housings, such as those made from aluminium, are susceptible to corrosion or developing porosity. 

Gaskets, designed to prevent fluid escape, can also fail by drying out or cracking with age, losing their crucial sealing effectiveness. Additionally, errors during fitting, like overtightening bolts, can distort the housing itself, inevitably compromising the seal and leading to unwelcome drips.

What are the symptoms of a faulty thermostat housing?

Clear indicators often signal a faulty thermostat housing. Key symptoms include:

  • a coolant leak, visible as green, pink, or yellow antifreeze puddles or crusty residue,

  • steam from under the bonnet,

  • engine overheating, shown by high temperatures on your dashboard gauge,

  • erratic temperature gauge readings, with the needle fluctuating,

  • engine running cold, which causes poor cabin heating and higher fuel consumption (due to an open thermostat),

  • rapid engine warm-up, which can potentially causing severe overheating (due to a closed thermostat),

  • gurgling or rumbling sounds from the cooling system,

  • illumination of the check engine light, which indicates relevant diagnostic codes.

Should You Use OEM or Aftermarket Thermostat Housing?

Replacing a thermostat housing involves choosing between an Original Equipment Manufacturer (OEM) part or an aftermarket alternative. OEM components are exact replicas, ensuring a perfect fit, form, and function, making them directly compatible. Aftermarket parts, from various manufacturers, offer several advantages:

  • often more budget-friendly,

  • reputable brands offer high-quality options,

  • can meet or even exceed OEM standards,

  • performance options, such as CNC machined billet aluminium, offer greater strength,

  • custom options feature unique stud patterns or AN/ORB fittings for bespoke radiator conversions.

For everyday maintenance, a good quality aftermarket component from a trusted brand is usually adequate. However, for performance enhancements or custom applications, specialised aftermarket parts are the best choice.

What is the average replacement cost in the UK?

Replacing a thermostat housing in the UK typically costs between £70 and over £300. This cost is influenced by several factors: the component itself (ranging from £20 to £70+, depending on OEM or aftermarket and your car's make and model), labour charges (independent garages often offer more competitive rates than main dealerships), and the job duration (usually one to three hours, including cooling system draining and refilling). Any necessary diagnostic work will also add to the total expenditure.

At Ecooparts, we offer a wide range of reliable, competitively priced thermostat housings for various makes and models. Save money without compromising on quality. Shop now and keep your engine running smoothly.