Volvo S40 The S40 is Volvo's most affordable sedan with all the amenities of a luxury sports car.

thermostat

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Old 04-01-2015, 02:29 PM
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Default thermostat

So I need a new one. There r three listed with three different temps. How do I pick the right one?
 
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Old 04-01-2015, 03:44 PM
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eeny, meeny, miney, mo......
 
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Old 04-01-2015, 10:18 PM
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Originally Posted by migbro
eeny, meeny, miney, mo......
Ha, sort of.

The 'temperature' of a thermostat does not effect the regular operating temp of an engine. If a car is designed to run at 200°F, it should run at 200°F no matter what temp thermo you put in it. The radiator and other design features of the cooling system control the maximum temperature.

A low temp thermo simply opens up at a lower temperature, which will cause your car to take longer to warm up in the morning. And why would you want to do that? In a street car there is NO advantage, and might even contribute to more wear on your engine.

That said, I believe stock temp thermostat for any year S40 is 90°C or 195°F. I would go with that.
 
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