Heater only blows hot when on high

Hi - Dave here, contributing to RepairPal and providing expert advice since 2010. Typically when the heater is only working on high speed, there is a concern with the blower speed controller – or resistor. Depends on your climate control system, if it's an automatic temperature control system, or a manual control. Not difficult to repair, but troubleshooting is necessary first. https://repairpal.com/auto-repair-near-me Click the link to find some shops near you who can help out!