Take it from someone who spent their childhood spending part of every summer on 3 day roadtrips (one way) in old cars...in the 80s! Old cars do not even have the OPTION of air-conditioning. They have air VENTS, but that's hardly the same thing (they just stir the hot air around really).
So, please stop writing about how the boys are all sweaty because the air conditioning is "broken"...write instead that they are all sweaty because they are driving around in a car that was built in 1967!
Thank you
PS: Yes, I do realize that improvements can be made to old cars - such as installing a tape-deck, which they have obviously done. But until I see canon proof that they've taken the time to install an air-conditioning system, I am going to continue to be annoyed by this.
ETA: Both
Also, the Impala would have had lap belts (that are probably never used)...and is an automatic transmission...and has a bench seat....and yeah, I think that's everything covered in comments. Feel free to chime in if I've missed something.
ETA (AGAIN): Ok,