Quote:
Originally Posted by jlspr
Do you mean the lower hose? Before the lower hose was cool and the top was hot. Now they are both hot. I'm wondering if the lower is hot from the temp under the hood. Its. It's not as hot as the upper is. Also would a stuck stat cause the fan not to come on? I haven't seen it come on yet since I've been driving the car. The sensor is right after the stat correct? So if its closed then it wouldn't know when to come on?
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They should both be warm after a while, so this sounds normal.
The fan should operate regardless of whether the thermostat is stuck or not because it should be controlled by a different thermostat that measures engine coolant temperature and signals the fan to turn on.
Do you have a way to measure engine coolant temperature? Most cars have a temperature gauge that isn't very accurate, but is useful to draw attention to serious issues with the cooling system. A Scangauge or Ultragauge also has the ability to report engine coolant temperature by connecting through the OBD2 port.
The term "thermostat" is confounding because it can describe a device that measures temperature, or it can describe a device which maintains temperature at a certain level. I'd prefer the thermostat in a car to refer to the device that measures the engine coolant temperature, and call the other thermostat a thermal variable control valve.