Overheating 2000 Jetta 2.0
Bought the car, realized it had a slow coolant leak. Figured out it was the plastic housing for the temp sensor. Replaced it and the sensor. Topped it up with off brand coolant. Worked for a couple days. Started over heating even though the heater in the cab still works. Flushed the cooling system with water. Worked for a couple days, then same thing again. Replaced the thermostat because the rad was staying cold. Got halfway to work this morning and it overheated again, even though I took it out yesterday and climbed a big hill in 4th to the floor to test it and it was fine. Rad is staying cold still. Both fans come on when ac is on, otherwise main fan seems to kick in randomly. Hoses seem to pressurize. WTF?