Question about Air Conditioning and Heat for GMC Terrain

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Air flow will now come out of upper vents

Air flow will not come out of upper vents

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There are air sensors that open/close and mix the air...this is one of the GM product problems I have the same thing on my 2003 Sanoma..there are easy fix ones and unfortunately mine is the hard fix requiring the dash removal..the other is a door spring or plastic piece broken..can be seen just under the dash where the sir box is..easy fix..have it checked that is the common problem..Hope the best and good luck..

Posted on Oct 03, 2014

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Posted on Jan 02, 2017

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I have to assume you mean on the top shelf of a refrigerator. If so, then you need to look for the air vent(s) that are usually in the rear of frig compartment either on back wall or under the frig compartment ceiling. These vents are pouring very cold air from the freezer and the air needs to get distributed throughout the frig, however the coldness is falling on the milk or meats that are in the way (getting hit with the cold before the air is disipated within the frig).
Three options: if the air vent(s) have a movable or directional cover, then redirect the air so it blows away from the food on the shelves. If there is no movable cover, perhaps adjusting the freezer control (not the frigerator control) to the next colder freezer setting; this will reduce excess cold flow pouring into the frig. 3rd, make a shield of plastic or metal or cardboard to divert the direct cold flow of the air vent from falling on the upper shelves.

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Either the damper that the air flows up through is closed or the return air flow vents are blocked with clear ice.

Do you feel the air come out all the way at the top of the duct assembly when the freezer door is opened (but it then stops when the door is closed)?

If so, then it sounds like your return air flow vents are clogged. These are located to the left and right of the duct assembly in the rear/bottom of the refrigerator section. Sometimes you may have to slowly pour hot water into these vents to get the clear ice to thaw. The water should go down into the freezer section behind the evaporator and then out the drain in the back.

If you do not get the air to flow out the top of the duct assembly then the damper is staying shut. This could be either a bad damper in the duct assembly or the main board my not be sending voltage to the damper. Hope this helps.

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