Heat is not working I put a new water pump on and a new thermostat? on 1999 Ford F-250 Super Duty

I seem to be losing coolant slowly but I can't tell where, but heat still doesn't work after I refill coolant. Another symptom is normal temperature while running but gets hot when at a idle. Any suggestions would be appreciated.

by in Dandridge, TN on December 20, 2013
1 answer
ANSWER by on December 20, 2013
POSS LOW COOLANT LEVEL