Skip the auto shop - Our mechanics make house calls

Q: There is a smell when the heat is on

asked by on

Sweey smell sometimes when heater on. It's not all the time and when looked under the hood the coolant overflow was normal

A: Hi there. The sweet smell is coolant leakin...

Hi there. The sweet smell is coolant leaking and the smell of the coolant is going through the cab vents. Check the heater core for any leakage, and look under the dash or on the coils of the heater core for any fresh coolant or steam. The only way you can smell the sweet coolant smell when the heater is on is either a heater core that is leaking or an engine coolant leak with the blend doors open to the outside air.

If you need further assistance diagnosing your vehicle, then seek out a professional mechanic, such as one from YourMechanic, who can come to your location to help you determine the source of the smell while the heater is on.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car heater isnt working.

This may be related to a faulty blower motor or blower motor relay. The blower motor is a unit inside your vent system that blows warm air from the heater core to the vents when the heater is on or...

Q: Judder at low speed and lose power

There are a few options to consider when diagnosing a loss of power problem like this. It would appear you are having and issue with either fuel, air, or spark. Were these issues occurring before or after the work you...

Q: Engine rattled, something fell out, and engine died

Hello. I would go ahead and follow the dealership's recommendation and have the updated water pump installed. I would also recommend having the belts, and any other pulleys, replaced if possible. If the vehicle is still under factory warranty then...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.