HEAT STOPPED WORKING. BLOWER FAN WORKS . A/C WORKS
Check your coolant level. Repair leak and top off fluid level. Then re-test operation.
Anytime the coolant level becomes low the heat will not work. If the coolant level is full , check both heater hoses to see if they are too hot to touch. If they are, your heater core is clogged and will need to be replaced.