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We got the 12v socket car use air cooling fan from www.amazon.com/dp/B010CESJTC , it helps so much that now we are OK to keep the weak air conditioner now for the summer.
The biggest challenge for baby in summer is on the trip. For our experience, we used a 12v dual head car cooling fan ( you can find it from https://www.amazon.com/dp/B010CESJTC ), use 3M stickers comes with the product to fix the fan in arm rest area, then it helps so much to blow the car's air conditioner cold air from front seat to back seat to keep the kid at back seat cool. When air conditioner is kind of weak during hot summer, it dramatically change the game! I am not worrying about the kid any more when driving for long trip.FYI.
In hot summer, we use the AboveTEK cooling fan ( https://www.amazon.com/dp/B010CESJTC ) to quickly blow away hot air from inside car, and so efficient! FYI.