Dumb question on overheating

[Babalu]

I posted a thread earlier on my 2008 Boxster S was overheating and developed a flat spot I replaced the expansion tank bought new caps and pulled the bumper cover off to inspect the three radiators wich were dirty especially in the corners I sprayed em with coil clean hosed em doen snd finally saw light through em with a flashlight at idle car is fine all fans are working but when I give it gas it has a a huge I guess vacuum leak when I dtep on the gas and the crankcase suction with oil cap is a lot checked lines going to intake from oil seperstor wich had a lil fresh oil in both fittings wich tells me this part is failing my two dumb questions are this vacuum leak when I step on. The gas or drive the vehicle would this cause the car to overheat? Second question looking for oil seperstors to replace mine I saw a internal oil seperstor for my vehicle but in Wayne’s book or google can’t find where this part goes or even if I have one oil clean and not losing coolant had lol pressure on coolant line under the car when gas pedal pressed wich in turn means I have flow idle fine gas it and it’ll start to heat up should Trykng to bleed air out by the valve on expansion tank doesn’t seem to work but lil confused maybe shop bound by thoughts would really appreciate it thanks babalu