Rather than modding the car, can you mod your trip? Much of the intermountain west gets cool to downright cold once the sun goes down, so if you can plan your trip to visit mountains/lakes/forests during the day (and let the dogs play!), and drive nights or early mornings, you won't have much need of A/C. Even further, if it's vacation and not going to a specific destination, driving through Colorado, Wyoming, and out to the Pacific Northwest is going to be a lot cooler (and have better scenery, IMHO) than taking I10 to LA.
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