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AC blows wrong


icon skull
04-28-2008, 05:39 PM
1994 S15 GMC Jimmy-air conditioner blows cold air but it all comes out the defrost or the heater ports, no matter where you put the switch.

brcidd
04-28-2008, 07:26 PM
Look underhood at the vacuum ball reservoir that is mounted to the hood- See if the rubber vacuum hose has come unplugged from the ball- this is usually what is wrong when as you have described your situation.....

icon skull
04-28-2008, 09:10 PM
only vacum ball is next to engine coolant reservoir, one hose on it. nothing is mounted on the hood but the light.

MT-2500
04-28-2008, 09:25 PM
Check vacuum lines from engine to heater controls.
Also make sure it uses one or two hoses on vacuum ball.
MT

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