Well it could be something the previous owner spilled in the vents, or sprayed into the vents to try to cover up a moldy smell.
You might try a detail shop to get rid of the smell.
Took it back to the dealership they disinfected and cleaned what they thought it was but it still does it. If something was in the vents then you would smell it all the time. What in the engine area smells like maple syrup?
I still go with taking it to a detail shop for advice. One possible cause would be coolant. It has a sweet smell and the heater core is under the dash.
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SOURCE: 2004 escalade ac problem
I had the same problem. Took it to an AC guy and they told me it was going to cost $1,400 to replace all kinds of parts. I didn't get it done right away because I went on vacation. When I got back from vacation the air blows cold. It hasn't gone back to blowing hot since.
SOURCE: difference between the cadillac escalade and the cadillac esv
the esv
is longer 16'', longer wheelbase and 21" in length
SOURCE: Cadillac Escalade
i had the same problem u need to take off and clean the throttle body and it clears right up
SOURCE: how to replace ac belt 2003 Cadillac Escalade ESV
1st: remove serpentine belt then use tensioner by ac compressor to relieve tension on ac belt.
remove old belt & install new one then install serpentine belt
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