I'm changing out the HVAC control module in my wife's 2008 Elantra. It's a really easy job if you know how, so I'll show you how. You'll need a #2 Phillips screw driver, and something thin that is suitable for prying. I used my pocket knife as my pry bar, but a plastic pry bar made for car interiors would be better. If you also have a stubby #2 Phillips, it will make two of the screws a little easier. if your screwdriver is not magnetized, you may also want an extendable magnet, but that's totally optional.
Be advised: some Elantras have the "OFF" switch on the middle (fan speed) knob, and some have the "OFF" switch on the right (blend selection) knob. They plugs on the back appear to be identical, but I do not know if they are interchangeable. Our original had "OFF" on the right hand knob. We bought a replacement, and it had "OFF" on the middle knob, and the module did not work. It may have just been a bad module, or they may actually be incompatible. I have no way of knowing at this time. We bought a second replacement module that actually worked, and it's "OFF" position was on the right, like our original one.
