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This is normal, depending on the depth of the hill. This is frequent with standard/manual cars on uphills, they can roll back, but with automatic vehicles they usually have a small amount of throttle, (you'll notice this when putting your vehicle from park into drive with your foot off the break, it'll start slowly moving forward)
Now on the hill, if it's a steep incline your car will move backwards, it all depends on how high your throttle (the car itself) is, and the incline depth of the hill.
Your Climate control unit may have to be reset. The reset works as follows: With the key in the ignition and in posistion 2 push both the defrost button and the recirc button (at the same time) for five seconds or untill the led lights in those buttons begin to flash. Wait for 30 seconds or untill the led's stop flashing. Switch off the ignition. Check the evaporator temp sensor and pressure sensor for correct functionality.
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