Hi just changed the thermostat on my 2.0 ts 2001 it went very smoothly , however when i came to run it up to temperature the gauge went up quite slowly but got to 1/4 way up the gauge heater blowing very warm. My issue is the bottom hose on the radiator is not getting hot, i took the car for a drive temp increase to 90 but not above it fluctuated slightly but not much. After about 10 miles with engine still running checked bottom hose and it was still cold. The rad is only 12 months old could my problem be an air lock or something more worrying. Oh yes when i filled the cooling system up i did it via expansion tank dont know if this would make a difference also the 4 pipes on the thermostat all seem hot.