Car trouble in Huntsville
Huntsville driving means long, hot summers, heavy commuting, and every few years a storm that tests both the car and the driver. The repairs that come out of that pattern are fairly predictable, which helps when you're deciding what to approve.
Summer heat
NOAA's engineering weather data for the Huntsville airport station gives a 1% summer design temperature of 92°F with a mean coincident wet-bulb of 75°F. Sitting in a parking lot in that heat, a car's air conditioning has a lot of work to do, and humid air adds to the load. If the AC blows cool but not cold, ask the shop to check for a refrigerant leak before recharging; adding refrigerant to a leaking system only buys a few weeks. A shop should be able to tell you where the leak is and what the fix costs.
Heat is also hard on batteries. Many batteries that fail on a cold morning were weakened the summer before. Ask for a load test, not just a voltage reading, if your battery is three or more years old.
Commuter miles
Redstone Arsenal was built in Huntsville during World War II, and NASA's Marshall Space Flight Center opened in Madison County in 1960; the jobs around them put a lot of commuter miles on local cars. Stop-and-go traffic wears brakes and works the cooling system. Ask the shop to measure pad thickness and rotor condition and show you the numbers, not just say "you need brakes."
Hail
The National Weather Service in Huntsville calls the May 2, 2003 storm one of the costliest hailstorms in Alabama history, with hail larger than baseballs in places and over 30,000 insurance claims, mostly for roofs and cars. Hail repairs usually go through insurance. Ask whether the shop does paintless dent repair or sends it out, and get a written estimate you can give your insurer. A cracked windshield from hail should be replaced before the crack spreads.
Snow and ice
Serious snow is unusual here, but it happens. On February 25, 2015, the National Weather Service reported 5 to 12 inches across most of north Alabama. Most local cars aren't set up for that, and drivers aren't either. After an icy spell, have the alignment checked if the steering wheel is off-center after hitting a curb or a pothole, and look at tire tread before winter rather than after.
Before you approve a repair
Ask for a written estimate that lists parts and labor separately and says whether the parts are new, rebuilt or used. Ask the shop to call you before doing anything not on the estimate. Ask for your old parts back. For a large repair, it's reasonable to get a second opinion, and a good shop won't be offended.