Question about 1998 Pontiac Bonneville
This is usually caused by a control door inside the housing for the heater. Sometimes pens or other obstacles go down the defroster vents and block the doors. Lay on the floorboard while someone controls the heat and vent controls. You should be able to see the arms controlling the vents and heat. You may have to remove the lower dash covers to gain access to see these controls. Also check to see if there are any engine vacuum leaks. The heater and vent controls are ran by vacuum sometimes.
Posted on Dec 29, 2010
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Posted on Jan 02, 2017
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