1995 Toyota Corolla coolant overflows

1995 TOYOTA COROLLA
220,000 MILES • 1.6L • 4 CYL • 2WD • MANUAL
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YAZO
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Hello, i have a problem with the coolant in the coolant bottle that over flows when the car drives for a long period. But the heat gauge is normal running temp and never over heats but spills the coolant into the water overflow. I have checked thermostat and all pipes i have even flushed and filled the radiator the radiayor flows fine too. But still does the same. I have done a head test buy the liquid changes colour very slightly a hardly noticeable colour change.what could possibly be my problem
Jan 22, 2015 at 1:25 PM
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JOHNNYT73
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Does the oil in the engine look normal? IT could be that your cap is bad. Its not allowing the system to build up pressure (raise the boiling point), and is causing the coolant to boil. Could also be that you have an air pocket. Try leaving the cap off and running the car with the heat on and kepp checking the coolant till it reaches operating temp (thermostat open).
Jan 22, 2015 at 1:38 PM
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YAZO
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Hi johnny thanks for your response i have bought a new cap and oil looks normal i have tried removing the the cap letting it run with the heater on.
Jan 22, 2015 at 7:44 PM
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JOHNNYT73
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Have the symptoms gone away since putting on the new cap?
Jan 24, 2015 at 3:56 PM
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YAZO
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No still the same
Jan 25, 2015 at 7:54 PM
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JOHNNYT73
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I think you may need to take the car to a pro to have your cylinder head checked.
Jan 25, 2015 at 7:59 PM