Because the heating and cooling systems work in tandem, problems with the cooling system will affect the heating system. Low coolant levels, for example, can affect the heating system’s ability to warm your vehicle’s interior. Leaking coolant can be attributed to a damaged heater core, radiator, heater hose, or cooling system. Sweet smells coming from the air vents are a sign of a coolant leak.
Other common issues that plague heating system components include a vacuum leak, heater valve failure, fan motor failure, heater core failure, or stuck thermostat. One of the most common causes of breakdowns is overheating, but heating system maintenance can help prevent this from happening. Consult your owner’s manual for recommended inspection intervals for the various heating system components, and be sure to seek out heating system repairs when necessary.