Wow, an iguana. I hope you know what you've gotten yourself into! Iguanas have very specific dietary, lighting, heating, and space requirements.
Check out
www.greenigsociety.org ,
www.anapsid.com , or
www.iguanaden.com for oodles of iguana keeping information. If you're planning on keeping him, you'll want to buy either "Iguanas for Dummies" by Melissa Kaplan or "Green Iguana: Ultimate Owner's Guide" By James Hatfield. The latter is best, but I have both and have referred to both on occassion.
For now, though, you'll need to feed him. Iguanas are 100% herbivore- never feed any kind of meat product. They need a salad with varied ingredients, most of which being leafy vegetables, but some of which being actualy veggies and fruits themselves. Try collard greens, mustard greens, dandelion greens, escarole, arugula or watercress with some chard, kale, or romaine lettuce. Don't feed corn, and go very moderate on the carrots (consider cooking them first or grating them) Orange squashes are great nutritionally, as are green beans and peas. Most igs like their fruit, but go sparingly on it.
You also might consider having a vet look him over since he might have been exposed to smoke and things; you know reptiles and their sensitive respiratory systems. While you're there, have them do a fecal.
Temps need a bit of work... bump his basking spot up to the low 90's for now since you don't know what his health condition is yet. But he should also be able to get away from the basking spot. The general ambient should be mid to low 80's, but there should also be a cool spot in his cage around 75F.
2 hours in a hot car might sound like a good thing, but I wouldn't let it happen again. Iggies can overheat very quickly and easily die if they can't get to a cool spot. Best to warm up a cold iggy slowly with a warm bath, not such an extreme temperature so quickly.
Make sure you mist his food really good so he can get rehydrated. While you're at it, mist him down. You might even consider offering him a nice warm bath.
I don't know what you're housing him in now, but keep in mind that iggy's need lots and lots of room to move around, stretch completely out (tail and all!) and climb. They are also very dependent on
UVB lighting, so you should look into getting some of that very soon.
I'm just going on my iggy/sick iggy experience. There are others here who have more experience rehabbing sick iguanas than I do, and I'm sure they'll have plenty to share as well. All the stuff I've briefly mentioned, and more, is covered in greater detail on the sites I gave you and the books I recommended.
Freddy is doing great.
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