Car air condition sickly sweet smell?

I got a new 2014 sonic, it was ok then after the fist oil change a sickly sweet smell came out of the air conditioner.

Years earlier I had a Honda Civic, after they told me my air filter needed to be changed it had also the same sickly sweet smell. What are they doing to make that smell, what is it?

Should I buy a 2005 Honda or 1999 Nissan?

I'm torn between which used car to buy. The 2005 Honda Civic Si has 250000 km and the 1999 Nissan Sentra has 110000 km. Both have been inspected and passed safety/e-test. Same price. Which is better?

Should I get Ziebart on my 2014 Honda Civic Si?

I'm moving to Rochester, NY in a few days and I was wondering… Is Ziebart really needed for all of the salt roads up north? I'm from Oklahoma and I was already scammed into the Poly-steel scam by my fiancée and I'm really not looking to pay more… Ziebart offered me 750.00 for a full undercoat plus wheels and inside of the door panels, but should I?

My car is making a knocking noise when my air conditioner is on?

I have a 2010 Honda Civic Hybrid. 2 weeks ago it was involved in an accident where the front end was damaged. When I got it back and turned the air conditioner on, it makes a somewhat loud knocking noise every 5 to 10 seconds. It seems to be coming from the front right side of the car. My car will vibrate, and then I will hear the noise. It doesn't ALWAYS happen when I have the A/C on, but when it is happening and then I turn the A/C off, it will stop. The radiator, condenser, and an A/C pipe was replaced. It still blows cold air.

Maaco vs Pro Body Shop for cosmetic damage?

My car is a 2005 Honda Civic Coupe. I have a very large dent in my passenger side door panel and also a few dents on the panel behind it. I was going to take it to Maaco, but am not sure the quality of their paint matching etc. I could take it to a certified body shop but its a lot more expensive. My main question is this… How well does Maaco match paint and how good is their work? My car is a magnesium metallic gray, so its a unique color if you look at it carefully, its not just a matte gray.

Is it best to leave the pro shops for the major collision damage and just take it to Maaco for the cosmetic damage?

Added (1). Basically, I need to have the entire door skin replaced and paint matched…

2015 Honda Civic Window Problem?

I recently purchased a brand new 2015 Honda Civic SE. But when I open/close any windows, the handle part of the door (on the inside where the window switches are), pops in and out. The door physically moves in and out (about 1-2 inches). Is this normal? I went to a dealership, and he told me it was very common, but wouldn't cause any problems. But I have a hard time believing that these types of problems passed quality, and they didn't do anything about it, especially if it happens to a lot of people.

This issue doesn't bother me too much, but I want to find out if I should get it checked out, since I don't want it to become a problem later on.