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Temperature gauge on dash on modern cars is a total work of fiction it tells you what the cars computers want you to see Often they will remain on N between 65 and 115c which is alarmingly high by old school standards and it is normal when the sensor unplugged for the gauge to sit on N and the fan to run.
Istr on Ford's the cooling fan low speed cut in temperature is about 105 to 108c
What exact symptoms are you getting ? I am thinking the cooling system isn't under pressure due to a failed pressure cap or pin hole leak
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
I wonder if the ECU has a bad ground - joining pins 4 and 5 at the obd plug would give it chassis earth. It may be worth a quick test while it's running but not when cranking the engine. Someone on another forum recently melted their scan tool lead because the scan tool plug automatically joins 4 and 5 and the engine had no earth so it used the scan tool cord.
Getting involved in discussions because I have a lot to learn still.
Can't be 200c and 200f isn't boiling. 200f is in the normal temperperature range of an engine and below expected fan switch on temperature.
Normal boiling point at atmospheric pressure as you find in a kettle is 100c that is 212f. In a radiator the anti-freeze solution is under presure so the boiling point running engine the coolant boils at over 120c that is 248f . If you take the presure cap off when the engine is hot but not hot enough for the computer to turn the fan on it will boil.
If the engine if forcing coolant out with the cap tightly on and the dash gauge on "N" and OBD2 reading 200c it could be a cylinder head gasket failure which there a test for but I would want to check the water circulation an.d pressure test the cooling stystem first
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
Can't be 200c and 200f isn't boiling. 200f is in the normal temperperature range of an engine and below expected fan switch on temperature.
Normal boiling point at atmospheric pressure as you find in a kettle is 100c that is 212f. In a radiator the anti-freeze solution is under presure so the boiling point running engine the coolant boils at over 120c that is 248f . If you take the presure cap off when the engine is hot but not hot enough for the computer to turn the fan on it will boil.
If the engine if forcing coolant out with the cap tightly on and the dash gauge on "N" and OBD2 reading 200c it could be a cylinder head gasket failure which there a test for but I would want to check the water circulation an.d pressure test the cooling stystem first
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
Can't be 200c and 200f isn't boiling. 200f is in the normal temperperature range of an engine and below expected fan switch on temperature.
Normal boiling point at atmospheric pressure as you find in a kettle is 100c that is 212f. In a radiator the anti-freeze solution is under presure so the boiling point running engine the coolant boils at over 120c that is 248f . If you take the presure cap off when the engine is hot but not hot enough for the computer to turn the fan on it will boil.
If the engine if forcing coolant out with the cap tightly on and the dash gauge on "N" and OBD2 reading 200c it could be a cylinder head gasket failure which there a test for but I would want to check the water circulation an.d pressure test the cooling stystem first
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
Can't be 200c and 200f isn't boiling. 200f is in the normal temperperature range of an engine and below expected fan switch on temperature.
Normal boiling point at atmospheric pressure as you find in a kettle is 100c that is 212f. In a radiator the anti-freeze solution is under presure so the boiling point running engine the coolant boils at over 120c that is 248f . If you take the presure cap off when the engine is hot but not hot enough for the computer to turn the fan on it will boil. That the pressure cap is working properly and the system is free from even minor leaks and holding pressure is really important.
If the engine if forcing coolant out with the cap tightly on and the dash gauge on "N" and OBD2 reading 200c it could be a cylinder head gasket failure which there is a chemical test for but I would want to check the water circulation and pressure test the cooling stystem first
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
Last edit: 5 years 7 months ago by Andy.MacFadyen.
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer." I have learned more by being wrong, than I have by being right.
It looks to me like a coolant circulation issue or a headgasket failure --- chemical test or gas analyser sniff test on the air space in the coolant expansion tank
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
ok so i found the problem i have another escape from a friend and i switched cabs and i was monitoring the obd scanner and at 220F the fans will come on
i`ve noticed the problem when i jump started a car and the tank was overflowing so that made me concerned
i really appreciated the help and i`m glad it was just a simple cap
(but if feel pretty stupid about this little thing)
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