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Thermostats are put in cars to regulate coolant flows throughout the engine. The thermostat is closed at cold temperatures so that the coolant can warm up really fast. Thermostats come in different temperature range so a 95 degrees thermostat will open up a lot sooner than one that is 110 degrees. Once the coolant reaches a set temp the thermostat opens to allow the coolant to run through the entire engine to keep it from overheating. At this point the warm/hot coolant also travels to the heater core located inside your cabin to give you heat in the winter. If it takes a very long time for your car to heat up in cold whethers, chances are your thermostat is bad or going bad. It is a good idea to replace the thermostat the same time you do the water pump as the coolant will be drained. Hope this helps.

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Q: How do you know if your thermostat is bad in your 2001 Subaru Outback?
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