Hello everyone! I drive a 2008 Passat Sedan (https://www.edmunds.com/volkswagen/passat/2008/sedan/)). Today after I parked my car, I noticed that the front bumper air vent was hot when I stood in front of it to clean the hood. I waited for at least 15 minutes, and it still felt warm. I didn’t use Air Conditioning at all when driving and I’m not sure if this is normal. I remember the same issue happened in winter a few years ago. And I noticed that the coolant level is close to the minimum when I opened the hood. Do you think it means that my car needs more coolant or there’re some other mechanical issues? Thank you!
Open the hood and look!
Tester
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In addition to what Tester posted, have you had your cooling system serviced? You should be nearing time for your fourth coolant change. At this age, do not be surprised if a plastic component of the system fails.
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+1
And, if it does need coolant, here are two important points to consider:
Be sure to use coolant that is compatible with VW’s coolant specs.
Because coolant doesn’t evaporate, a low coolant level indicates that you have a leak, or that it is being consumed in the cylinders, and if the latter is the case, that’s not a good thing.
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Thank you for your comments! I remember 5 years ago my car had a coolant leak. I’ll take my car to a body shop for a checkup.
You want a mechanic, not a body shop.
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Why would you take it to a body shop for a probable mechanical issue? 
Would you go to a Plastic Surgeon if you needed surgery on your internal organs?
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Thank you so much for the reminder! I used to take my car to an official VW dealer whenever it had mechanical issues like this. They charged a lot and didn’t solve the issues of my car completely. So I’m not sure where to take my car besides a body shop owner I trust (he replaced several parts of my car last year). I’ve emailed him to see if he could refer me to an auto mechanic. Really appreciate all the advice here!