When your vehicle experiences problems with its heating system, it is often due to a problem with your heater core, or your climate control head (see our page on Climate Control). For the majority of vehicles, the heater core is located deep inside the dash and requires extensive labor to access and replace. In most cases, all or most of the dash must be removed to replace the heater core. Though heater cores or climate control heads are the most common causes of lack of heat, there are many issues that could contribute to this problem so it is best to bring your vehicle in for a free diagnosis.