Tips on Buying a Replacement Thermostat Housing Cover
The thermostat housing cover is a relatively straightforward function in your vehicle: it houses and covers the radiator thermostat and directs the flow of coolant to and past the thermostat whenever the valve opens. The cover is essential in ensuring accurate readings of the thermostat, so when it malfunctions due to wear or damage it must be replaced immediately. Thankfully, replacement thermostat housing covers are can be easily purchased in auto parts stores as well as in online retailers.
In this guide, we will share with you some tips on buying a replacement thermostat housing cover for your ride.
Thermostat housing covers are usually made of three materials: pot metal, aluminum, and a plastic composite. Older vehicles, particularly the vintage models, typically have a pot metal thermostat housing cover, while newer models have aluminum or plastic housing covers.
Ideally, you should get an aluminum or thermostat housing cover, as these tend to last longer and are invulnerable to corrosion compared to covers made of pot metal. However, if you have a classic car, using a pot metal cover may be inevitable. While there are manufacturers that offer thermostat housing covers for classic vehicles made of upgraded materials, they are not normally OEM-compliant that may lead to fitment issues along the line.
When buying a thermostat housing cover, it is recommended to purchase one that comes with the gaskets included. Thermostat housing covers require two gaskets: one to seal the gap between the cover and the engine block and the other one - usually an O-ring - prevents coolant from seeping past the thermostat inside the housing. These gaskets must be specifically designed to match the housing cover to ensure a perfect seal, so make sure that the housing cover you purchase comes with these gaskets.
As mentioned earlier, the thermostat housing cover is designed to protect the thermostat. But not all thermostats are the same, with different thermostat housing covers made available to be compatible with these distinct thermostat types.
Basically, thermostats come in two forms, namely the wax thermostat and the double valve thermostat. A wax thermostat, as its name implies, uses a small wax pellet to gauge the temperature of the coolant and release it once it gets hot. A double-valve thermostat, on the other hand, uses a similar wax pellet but has an additional primary and secondary disc valve for a more precise control of flow of the coolant. These thermostat types use a different type of housing covers, so make sure that you purchase the right one.
Another thing that you should never do without when buying a thermostat housing cover is the warranty. Even OEM-grade thermostat housing covers are no guarantee that it will function properly in your vehicle, and even if it did it is not 100% certain that they will do so in the long run. Most branded thermostat housing covers offered in stores today have comprehensive warranty and return policies, although many off-brand models now also offer housing covers with fairly adequate guarantees. But whatever you do, always check for and buy a thermostat housing cover with a certified warranty policy.