z31t70

i bought a tt with a bad turbo. now that i have replaced the turbo the car keeps heating up. i checked the thermostat and its not stuck, water pump fins feel good, system does not seem to get pressure no matter how hot it gets. the only thing is that i bypassed the auxilary water pump. does the car really need it? and fans do turn on with ac, even then it heats up. please help im sord of new to the 1.8t.. i dont want to replace the water pump or spend 100 on the aux pump if its not needed.