The environmental experts this year are suggesting that it's going to be really hot out in the summer. I remember my first car - no heat, no AC, no floor ... lots of exhaust inside ... ah ... the "good ol' days". Not now! Now I always make sure I have air conditioning!
When I take my dogs out with me, I always make sure the AC is running properly in my vehicle. I figure that if I find it warm out, then my dogs must be overheated. Two of them are long haired and it doesn't take much for them to be too hot. Remember this when you're out and about this year with your canine companions.
Here in Ontario, we've already had a few days at 23C and if it's that warm outside then that means the inside of your car is WAY warmer! My sister lives in Tennessee and she said they have the AC on already.
When you take your dog out and about with you, please remember their comfort too. If you don't already have auto air conditioning (AC), consider having it installed. I don't know much about cars, but I do know that you can get an air conditioning compressor online at 1Airconditioning.com.