Can you drive a car with a faulty thermostat?
This depends on how the thermostat is broken.
Most are designed to fail in an open position, however any can fail in a closed position (or partially closed).
If it is failed in a closed position then you cannot really drive it with the thermostat broken, as the engine would overheat.
How long can I drive my car with a bad thermostat?
The furthest you can drive an overheating car is about a half a mile before you risk irreversible engine damage.
While some vehicles could still make it as far as 20 miles, we would never recommend driving very far with an overheating engine.
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