Does Your Austin Healey Need a New Thermostat?

Keeping Your Cool: Why This Small Part Matters

Let’s be honest—most of us don’t think about the thermostat until something goes wrong. Overheating on a sunny Sunday drive or watching your temperature gauge dance around like it’s got stage fright usually does the trick. But this small, affordable part plays a huge role in how well your Austin Healey runs.Replacing the thermostat isn’t just preventative maintenance; it’s one of the smartest and most cost-effective things you can do to protect your classic Healey’s engine. So let’s dig into why it matters—and when it’s time to replace it.

In an Austin Healey, the thermostat regulates coolant flow between the engine and the radiator. When the engine is cold, the thermostat stays closed, allowing it to warm up quickly. Once it reaches the specified temperature—typically 74°C or 82°C—the thermostat opens, letting coolant flow through the radiator to maintain optimal operating temperature.

Think of it like a bouncer for your coolant system: it knows exactly when to let coolant in and when to hold it back.

Don’t Forget the Thermostat Housing

If you're replacing your thermostat, it's worth checking the housing for corrosion or warping—especially on cars that have seen decades of use. A clean, solid housing ensures a proper seal and prevents leaks.We stock both standard options:

Part: CHT120A Thermostat Housing 4-Cylinder Application: BN1 - BN2 Order Now

Part: CHT120 Thermostat Housing 6-Cylinder Application: BN4 - BJ8 Order Now

Final Thoughts

Thermostats are one of those unglamorous but essential parts of keeping a classic Austin Healey in top form. They're easy to overlook—until your temperature gauge gives you the cold shoulder or your heater blows air colder than a Yorkshire winter.

So, whether you're fine-tuning your Healey for springtime drives or sorting a cooling issue before it escalates, swapping out the thermostat (and checking the housing while you’re at it) is one job that pays off.

And as always, we’re here with the right parts—because close enough isn't good enough for your Healey.