between 15 and 20 minutes

Similarly, can you drive a car with a faulty thermostat? Technically, yes, but you really shouldnt. With out a functioning thermostat the coolant cant circulate so your car will quickly overheat. It does depend on the make and model but even overheating for a short time can have pretty devastating effects on an engine.

In this regard, what are the symptoms of a bad thermostat?

There are several common symptoms associated with a bad or failing thermostat that will alert you that service is due.

Temperature gauge reading very high and engine overheating. Temperature changing erratically. Coolant leaks around the thermostat housing or under the vehicle.

Can I replace my thermostat myself?

An experienced DIY-er can install most programmable thermostats and some smart thermostats. Dont forget to turn off the breaker to the HVAC equipment! If the job requires more than just a replacement, a certified HVAC professional can ensure proper installation, as well as operation of your heating and cooling system.