It needs to be long enough to make sure all the systems work. The engine needs to get warm to check the heater and air conditioner.
May 9, 2013 at 10:41 AM
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THIS IS MIKE
✓Experienced Mechanic
686 POSTS
Make sure to drive over different terrain, bumps, hills, tight turns, acceleration and braking. Depending on the problem reported it may take a longer test drive to see the symptoms.