alfas
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| posted on 11/8/17 at 11:47 AM |
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cooling temperature without pressurized cooling system
by mistake i forgot to close the lever on my radiaotr cap (cap is on thermostat housing, ford x/flow, overflow goes in an open bottle), means the
cooling system didnt get pressurized.
i was driving quite a long distance, outside temperature at the day was around 28 degrees, mix between a-roads, b-roads, mountains etc. and wondered
why my cooling temperature was around 5-10degrees lower than usual....until i recognized when arriving back home in my garage that i forgot to close
the lever.
anybody can explain me this phenomenon?
i know that pressurizing the system sets the boiling point of water higher, but never expected that an unpressurized system runs cooler?
typing those lines i remember having seen trucks in (hot) 3rd world countries driving around with removed radiator cap
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r1_pete
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| posted on 11/8/17 at 12:19 PM |
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Under atmospheric pressure, water boils at 100 deg C, so that is the maximum temperature it can achive.
Under pressure it can and does exceed that temperature, hence the immediate boil when the pressure cap is released.
Running without a rad cap will result in the water boiling away.
Your coolant level may have also dropped below the temp sensor, causing the low reading.
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alfas
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| posted on 11/8/17 at 02:11 PM |
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i know all those physical things...
the coolant level was spot on, the thermostat housing full of water (consecutively the temperature sender , which is lower than the thermostat
housing, also covered with water)....thats why im wondering
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