The thermostat won't blow heat anymore - Cars & Trucks

It sounds like either a fuse for blower motor or wires to it. Or blower motor may have just quit. Depending on the year..make..and model.. could be vacuum or electrically controlled. Check fuses first!!!!Also. Check coolant level aswell!!!! Sometimes low coolant doesnt allow heat to blow through the vents. Just cold. If you are low on coolant. Refill it when vehicle is cooled down after not driving. Check after 2 hours of driving. If level has changed. Check under oil cap for milky consistency. Check for visible leaks on ground. Hope this helps get you started