Q: There is a coolant smell coming from the vents.

asked by on November 04, 2016

losing coolant and can smell antifreeze through the air vents once the engine is warmed up. Can't see any spills or leaks from the engine bay or on the ground. Also, the window fogs up when the heater is on. I think it's a heater core, but there is no quote on your site to fix that specifically, just upper or lower hoses..

My car has 118000 miles.
My car has an automatic transmission.

Smell in the car Inspection $94.99 - $114.99 Get a Quote

A heater core is the most likely failure you are having since it is causing the smell and fog on the window. You will need to have the heater core replaced. The heater core is mounted inside the A/C heater evaporator case behind the dash and, in order to replace the heater core, the entire dash needs to be removed for access to the heater case, and then it needs to be removed from the vehicle so the core can be removed and replaced.

This is more than a one day job and will need a full day and a half for most experienced mechanics to perform, which is why it is not listed as a repair, since we work outside and cannot leave a vehicle unfinished. I recommend having a certified mechanic, such as one from YourMechanic, come to your location to determine the exact source of the smell and determine what repairs are needed.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I set the temperature to synchronized mode?
When your vehicle is in synchronized mode, then the temperature settings will remain the same for both the driver and the front passenger. To turn on synchronized mode, press the SYNC button, then control the temperature settings with the driver’s...
Car leaking antifreeze
It is possible that the leak is coming from a hose; depending on which hose or water outlet the hose is connected to, this could be a relatively simple repair. However, the cooling system should be pressure-tested to verify the...
Why is my trip meter not working?
The trip odometer display typically allows you to track an A or B trip on a 2015 Dodge Avenger. If you've referred to your owner manual and followed the instructions for resetting the trip odometer, and it's not working, it's...
I have a clicking noise coming from my serpentine belt.
Hi there. To see if the idler pulley is making the noise or the crankshaft pulley is making the noise, simply remove the serpentine belt from the engine and start the engine. If the nose goes away, then a pulley...
Cv joint keeps breaking
Hello, thank you for writing in. The vehicle may be experiencing one of several different issues. The first thing to consider is the quality of the replacement you purchased. Re-manufactured CV joints are not terribly uncommon. When you purchase the...
P0420 code and engine is not starting.
Hi there. The p0420 (https://www.yourmechanic.com/article/p0420-obd-ii-trouble-code-catalyst-system-efficiency-below-threshold-bank-1-by-jamahl-walker) code means that the catalytic converter is below threshold and is not functioning correctly. This code comes up when the catalytic converter can no longer burn off any fuel in the exhaust system. Take a...
My car keeps cutting off when I put it in reverse and sometimes when it idles.
Hi There, Based upon what you are describing and how the car responds to load, it sounds like you may have a faulty MAP sensor. The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is...
My steering wheel is locked.
Hi there. Sounds like the steering wheel lock solenoid is not working. To get to the solenoid or to remove the lock, you would need to remove the battery cables (https://www.yourmechanic.com/services/service-battery-cables) (both) and remove the horn with the airbag from...
replaced the starter. went to connect the negative battery terminal, the starter made a whirring sound and sparked at terminal.
Electrically, there a couple scenarios that can account for this, all equally odd, but if you were not having any problems with the car's starting circuit prior to replacing the starter (i.e., just the starter motor failed) and you have...

Related articles

The Best Used Cars to Buy for Dog Owners
Dog Dog owners are a special breed of drivers. When they shop for a used car they have a list of requirements that can be quite different from other drivers, which tends to make the process a bit of a...
How Long Does a Coolant Tube Last?
The The coolant tube, or hose, carries coolant to and from the engine in your vehicle. First, the coolant tube removes the hot coolant from the engine and brings it to the radiator which cools it down. The cooled fluid...
How to Replace a Coolant Level Sensor
Coolant level sensors are faulty if the coolant level sensor light stays on extensively or the engine overheats without the light coming on.