i'm trying to narrow down the possibilities of why my car is overheating very badly. i just finished my motor swap and turbo, and i drive the car for a few minutes, it gets up to temperature and then pegs out in the red, boiling coolant in the reservoir and cracking the plastic end tank on my radiator. would this be caused by a bad water pump, faulty thermostat, or something else? my guess is that the motor i bought had a blown headgasket. i did a compression check today, and the number one cylinder hit barely 100, then hit 175 on the next revolution. then they all pretty much hit 175 with no problem. the car runs, it just gets hot and stays hot, fan blazing and coolant boiling. any other things to look into, i'll check them... could this also be the cause of my iacv cel and crappy idle?