The heater in the lx is not very warm.i checked with an automotive thermometer and the air coming out is 120 deg.i checked my new truck and it is 150 deg.i changed the thermostat to a 192 and triple checked to make sure it is in right,and changed heater core about 6 months ago.the water pump is also new.i also checked to ensure the knob from hot to cold is all the way on the hot side.my temp gauge in car at idle is only about 160 and at cruising speed will go up to about 175deg.any ideas??????