You might want to check on the side right beside the vent. There is a switch that goes up and down with a solid square on top and an open square on the bottom. This controls whether or not your vent is open or closed. Just try sliding the control to the open square and that should open up your vent. If that doesn't work then something could be blocking your vent. Such as a clog.
possibly the blend door actuator.
The 2003 Jeep Grand-Cherokee has a drag coefficient of .45 Cd.
The gross weight of the 2003 Jeep Grand-Cherokee is 5150 lbs..
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The grand Cherokee is a body style, sport is a trim package that is used on all jeep models(wrangler, Cherokee, grand Cherokee, patriot, ...)
The 2003 Jeep Grand-Cherokee has 12 valves.
The 2003 Jeep Grand-Cherokee is a gas-powered vehicle.
The 2003 Jeep Grand-Cherokee has overhead valves (OHV).
The 2003 Jeep Grand-Cherokee has a 4-speed automatic.
The 2003 Jeep Grand-Cherokee has an inline 6 engine.
The maximum payload of the 2003 Jeep Grand-Cherokee is 1100 lbs..
The 2003 Jeep Grand-Cherokee runs on regular unleaded.
The 2003 Jeep Grand-Cherokee is 15 ft. 1.6 in. (181.6 in.) long.
The 2003 Jeep Grand-Cherokee's turning circle is 37.4 ft..
The 2003 Jeep Grand-Cherokee has a 28.6 degrees angle of departure.
The 2003 Jeep Grand-Cherokee has a drag coefficient of .45 Cd.
The 2003 Jeep Grand-Cherokee has a 36.7 degrees angle of approach.