Dear friends. I do have the trickiest failure ewer. The car is a Vectra x20xev with automatic gear. It just had an overhaul, so the engine was completely apart. I just put back everything where it should be (at least I thought). The engine is running and no failure code is shown. BUT. Once is heating up it creates a huge pressure in the cooling system. Just to understand: Expansion tank open I just watch the coolant level and is normally till it reach around 90C. then he start to rise rapidly!!! (radiator already hot!) If I close the tank, he goes under pressure and stays so for couple second, then sucks the coolant out of it, till normal level. But the pressure will still remain.(it is fissing when I try to open).
My thought is that somewhere around EGR is entering exhaust gas in the cooling system. I tell this because in Idle, the engine warms up normally end the pressure is not created. Just when I drive it so EGR is operating. I went to a mechanic, but he has no glue. It is important ta say that the thermostat was taken out (mechanic did it) radiator heats up normally, temperature rise up till 90 then fun is spinning up and cooling down to 85. No sign for overheating no 100C! Just the pressure!!! So quetion for me is: How can the exhaust gas enter the cooling system??? How do I find the place. What did I installed wrong? any idea or advice can help. :-(
BR
My thought is that somewhere around EGR is entering exhaust gas in the cooling system. I tell this because in Idle, the engine warms up normally end the pressure is not created. Just when I drive it so EGR is operating. I went to a mechanic, but he has no glue. It is important ta say that the thermostat was taken out (mechanic did it) radiator heats up normally, temperature rise up till 90 then fun is spinning up and cooling down to 85. No sign for overheating no 100C! Just the pressure!!! So quetion for me is: How can the exhaust gas enter the cooling system??? How do I find the place. What did I installed wrong? any idea or advice can help. :-(
BR
