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Discussion Starter #1
Hello everyone. This is probably a previously discussed topic here, but can anybody tell me what could possibly be the cause of a very bad toxic smell coming out of the left driver's a/c vent ?. Sometimes when I am driving and come to a stop, that awful smell appears. I think it is burnt coolant smell, but everything around the engine and coolant reservoir looks fine. I even took it to a local Chevrolet dealer for service and they replaced the water pump, and the smell comes in from time to time. Any feedback will be greatly appreciated.
 

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Discussion Starter #5
The smell happens when car is running / engine hot. It is a 2014 LTZ. I say toxic because it really smells as if something leaks, specifically when I stop or start running the car after stopping at a red light or such. Happens veery seldom. It does not smell like oil burning when dripping on the hot engine block, but more like coolant burning. One day when I stopped at a red light and it started to smell, I noticed a bit of smoke coming out of the hood, driver's side, exactly where the fuse box is located. When I parked the car I opened the hood to check out the area and everything looked fine.
I really appreciate the responses!. God bless!
 

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Check that your cap for the coolant reservoir is tight. That cap has caused a lot of smell issues...if you don't see anything obvious take it to the dealer. It should be under warranty unless your mileage is high.
 

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Discussion Starter #7
Good deal, I'll check it right away. I'll reply the results... fingers crossed!.

Thanks for the feedback!!
 

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The 2014s don't have the issue with the HVAC grease, which eliminates one source of odor. Engine being hot reduces, but doesn't eliminate the possibility that you're smelling mold/mildew.
 

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Discussion Starter #10
I really appreciate all the responses. I'll try replacing the cap first, as I was able to notice a bit of residue buildup on one side of the cap around the O ring
 

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Your cap isn't holding pressure. In the thread I referenced there is information about the cap/tank seal.
 
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