I have noticed in the last couple of days that temperature gauge is fluctuating medium to high. I can hear my radiator fan running at high speeds all the time and even with the heat turned off my cabin gets very toasty near the engine compartment. I have checked the oil and coolant levels and they are normal. I have checked my air filter and noticed some oil residue which tells me it may be plugged PCV valve. Problem is, my car is a 1994 Infinity Q45 and PCV valve is not readily available off the shelf and also nearly impossible (for me) to get to. So, here's my question, can a plugged PCV valve cause engine to overheat or should I look at something else?