I have an '06 sedan. There has been a slight antifreeze odor lately after I shut the car off. I checked the levels, they are ok and so is the cars temperature when running. No problems with the A/C either. Recently after a hard rain I noticed the floor of the front passenger side was very wet. I thought maybe the window had been cracked open and some water got it but then it happened again last week. The second time I know the window was sealed. I looked under the car and did not notice any holes in the floor pan. Any thoughts? Could the two issues be related?

 

My initial assesment would be that your Heater Core is leaking.... hence the smell... however the issue with the floor only being soaked after the rain wouldn't be related to that I wouldn't think....