2018 Yukon..Vinegar Smell&A/C issue

ComoYukonXL · Jul 6, 2020

Came across a funny vinegar smell lately when I first turn on our 2018 Yukon XL. Has anyone else experienced this before?

Also, unsure if my air is working correctly because at stop lights it really doesn’t cool that well.

Thank you to all in advance.

swathdiver · Jul 6, 2020

ComoYukonXL said:
Came across a funny vinegar smell lately when I first turn on our 2018 Yukon XL. Has anyone else experienced this before?

Also, unsure if my air is working correctly because at stop lights it really doesn’t cool that well.

Thank you to all in advance.

Do you have a set of gauges to take high and low side readings? It's probably low, but if so, the why needs to be determined.

GreyStone · Jul 6, 2020

ComoYukonXL said:
Came across a funny vinegar smell lately when I first turn on our 2018 Yukon XL. Has anyone else experienced this before?

Also, unsure if my air is working correctly because at stop lights it really doesn’t cool that well.

Thank you to all in advance.

Do you have a cabin air filter?

ComoYukonXL · Jul 6, 2020

I do, and probably should check/replace that.

OR VietVet · Jul 6, 2020

Could also be the smell built up from mold on a/c evaporator that is kind of common on some rigs. I think it also depends on how well the a/c drain drains and the area it is driven.

I also agree with @swathdiver about low on refrigerant. Needs gauges on it and post readings here. Readings when a/c is off and when turned on.

gat0r · Jul 6, 2020

definitely check your cabin filter.
then run by dealer & have them check the status of "afterblow" feature in your ECM.
have them enable it , if it is not.

OR VietVet · Jul 6, 2020

Also, you could have a cat climbing in somewhere that pisses and then the smell comes in the vents. Cat piss=vinegar smell

wu6fiend · Aug 1, 2020

ComoYukonXL said:
I do, and probably should check/replace that.

Definitely start with a new cabin filter. Changed mine today (slightly embarrassed to admit its the first time its been changed, and the Yukon's third anniversary has come and gone). Filter was amazingly dirty, clogged with dust and loaded with small leaves. I will make it a habit to replace these cabin filters regularly from now on.

hcvone · Aug 3, 2020

gat0r said:
definitely check your cabin filter.
then run by dealer & have them check the status of "afterblow" feature in your ECM.
have them enable it , if it is not.

This makes a big difference, had it done on all my GM cars/trucks, helped get rid of that smell in my cars that don't get driven daily

2018 Yukon..Vinegar Smell&A/C issue

ComoYukonXL

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swathdiver

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GreyStone

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ComoYukonXL

TYF Newbie

OR VietVet

Multnomah Falls

gat0r

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OR VietVet

Multnomah Falls

wu6fiend

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hcvone

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