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Old 01-26-2010, 11:15 PM
0twinview0 0twinview0 is offline
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Join Date: Jan 2010
Location: Nashville, TN
Posts: 5
Isuzu NPR a/c air won't change from dash and floor vents

Hey I have an 1998 Isuzu NPR 5.7l gas that has AC and Heater air only coming out of the dash and floor. The selector switch moves on the AC control unit but the air discharge is always on the dash and floor. What could be the problem? I have been told that the vacuum pump on the alternator could be bad. I looked at it but don't know how to check it. Is that even part of the AC system? Also, what all does the vacuum pump do on this truck?

Thanks For Looking
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Old 01-27-2010, 08:33 AM
Drew Gemma Drew Gemma is offline
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Join Date: Jun 2004
Location: Canton Ohio
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I would start with the switch behind the dash first that is cheaper and mosre likly the problem.
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Old 01-27-2010, 08:27 PM
0twinview0 0twinview0 is offline
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Join Date: Jan 2010
Location: Nashville, TN
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OK SOunds good to me. If I remove the AC control unit, where is the switch loacated or do you know the name of it?

Thanks for the advice
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