Alright so my 2000 vw beetle is overheating. I tested the fans and they work. I've replaced the coolant temp sensor, coolant hoses, and fan module. Yet the fans still won't come on and I'm overheating. I know from the past if the coolant doesn't flow through the system the fans won't work but I replaced the thermostat a year ago. However when we tried to vacuum pump the air out of the system the coolant wasn't flowing at a steady stream like it needs to be. I'm going to test the thermostat but if that's not the problem what else could it be?