1997 BMW 528i Questions

All 1997 BMW 528i Questions

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there are no leak - when I release the pressure after the radiator cools down and add a little water from the pressure released it no longer goes to the red overheating mark
Just bought it it's my first bmw can someone please help
or is there a way to clean the sensors? And is there a way to try to clean out the catalytic converters?
at low speed. could it be fuel filter or fuel pump. Fuel filter has never been replaced.
how do I disconnect the security alarm or reset it so the car starts