Why is there a gas smell inside the car when starting car in A/C heater on?

Asked by Dec 18, 2013 at 02:46 PM about the 2006 Nissan Altima 2.5 S

Question type: Maintenance & Repair

I have a 2006 Nissan Altima 2.5 S with 111,000 miles on it. Lately, I smell sweet
gasoline smell when I start the car engine with A/C heater on. I can smell it through the
front A/C vent which stays for a couple of minutes and then fades away when I drive the
car for about a 1/2 a mile. I noticed this started only when it is cold outside and when I
start my engine in the morning to go to work, or after work to get home. I also tried
turning the A/C to cold the smell goes away. Is this something serious and should be
taken care of immediately?

2 Answers


I think what you are smelling is a coolant leak, because you mention the word "sweet" and heater "ON". Gasoline NEVER has a sweet smell but antifreeze ALWAYS has a sweet smell/taste and that is why animals drink it and die. Check your passenger floor for tell tale signs of coolant leaking from the heater core.

1 of 1 people found this helpful.

Take care right away. if it is a coolant leak you dont want to overheat if it gets worse, but if it was that is would get worse as you warm up so i believe it is a fuel leak but from a injector. when air is pulled from outside it brings the fumes that accumulates from higher fuel pressure in fuel lines when car is stopped. it wont do this as much while you drive so it goes away. just a thought.

4 of 4 people found this helpful.

Your Answer

Nissan Altima Experts

  • #1
    Tom Demyan
  • #2
  • #3
    Cassie Sapphire
View All

Related Models For Sale

Used Nissan Maxima
252 Great Deals out of 22,718 listings starting at $1,400
Used Honda Accord
965 Great Deals out of 59,154 listings starting at $1,099
Used Toyota Camry
891 Great Deals out of 81,516 listings starting at $999
Used Honda Civic
740 Great Deals out of 68,802 listings starting at $1,350
Used Nissan Sentra
568 Great Deals out of 52,471 listings starting at $1,599
Used Hyundai Sonata
716 Great Deals out of 50,453 listings starting at $1,995
Used Toyota Corolla
755 Great Deals out of 54,182 listings starting at $1,500
Used Chevrolet Malibu
931 Great Deals out of 64,932 listings starting at $1,995
Used Ford Fusion
911 Great Deals out of 66,353 listings starting at $1,500
Used Dodge Charger
396 Great Deals out of 28,196 listings starting at $2,490
Used Kia Optima
386 Great Deals out of 30,178 listings starting at $1,900
Used Chevrolet Impala
536 Great Deals out of 35,070 listings starting at $800
Used Hyundai Elantra
456 Great Deals out of 46,606 listings starting at $795

Used Cars For Sale

2017 Nissan Altima 2.5 S For Sale
13 Great Deals out of 10,673 listings starting at $11,926
2016 Nissan Altima 2.5 S For Sale
62 Great Deals out of 3,354 listings starting at $9,908
2015 Nissan Altima 2.5 S For Sale
153 Great Deals out of 4,643 listings starting at $8,495
2014 Nissan Altima 2.5 S For Sale
73 Great Deals out of 2,083 listings starting at $3,900
2013 Nissan Altima 2.5 S For Sale
31 Great Deals out of 1,154 listings starting at $5,499

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.