it wobbles when you reach med to high speed.
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.