fews days mt car overheated, since them I changed the water pump, radiator expansion tank termostast, hose. But a lot aire ccome every time I start the car. I bleeded all I could. but geting overheated after short runiing. Now the computer showme a new sign, I neverf see before, that said pression oil too low. stop the engine.so I stop. next day was very cool I start the car. no sign of oil while was cold, afyer getting hot, the sign came again. also I chequed oil. no water, but the exaust pipe in the driver side starting to fume, like in the winter time. any sugestion?