sat at traffic lights the oil pressure light starts to flash. engine is z18xe.
when i move off its fine again. read up that its caused by the engine getting too hot. but iv changed the thermostat, stat housing and cts in the last week. coolant was also changed for new stuff. is there an airlock somewhere or a blockage stopping the coolant getting round?
coolant will flow into the overflow tank and then suddenly it will stop flowing in and the top coolant hose (to the radiator) is very stiff, and have to unscrew the overflow cap to let some air out and then it will flow fine again. should i take it to a garage and have the system bled properly?