![]() This cools the coolant very well, desaturating the radiator in the process, and so the cold coolant shuts off the switch. When the radiator hasn't cooled the coolant enough, it turns on the fans. Thusly, it is kind of "testing" radiator function. It's located at the upper left corner of the radiator, the place where hot coolant will go if it's not getting cooled off enough by the radiator. The fan switch does one thing: form the upper bound for the temperature range. This "third position" forces all hot coolant to travel to the more-efficient radiator, and is why you should use a genuine SAAB thermostat, not an aftermarket one, which will likely only have two positions and may block off your heater circuit permanently. The second thing the thermostat does is block the inlet to the heater core when the car overheats. When the coolant starts getting warm, it opens, allowing warm coolant to hit the radiator and displace cold coolant from the radiator back up into the engine. When the coolant is cold, it remains cold, so the engine will only have to warm up the coolant in the block. First and foremost, it sets the lower bound for the temperature range. The thermostat in our cars does two things. A narrower operating range means the head and block will be undergoing narrower expansion/contraction cycles, and because they are aluminum and steel, different expansion/contraction ratios will be less likely to cause head gasket failure.įirst of all, we must think about how our cooling systems work. The only argument of his that really makes any sense at all is the argument that the 82º thermostat coupled with an 82º fan thermoswitch will keep the temperature within a very narrow range. He gives several reasons for this, including that you'll have more time to respond to a potential overheat situation. On this site, he does not hesitate to insist that all c900s would have fewer cooling system problems (and even fewer head gasket failures) with 82º thermostats. ![]() One of the first sites we all get directed toward as new c900 owners is Tom Townsend's SAAB advice site.
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