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I would first check for a vacuum leak, going to or after vacuum selector valve. Check all the vacuum lines to make sure there aren't any holes. They are small hard plastic lines wich tend to dryrot and crack easy, so be carfull not to break them when looking. Replace anything that is damaged or looks to soon be a problem. You also need to check the vacuum at the diaphragms to make sure they hold a vacuum. All of this should be located under the dash, mainly on the passengers side. You may have to check the main vacuum line coming in to the system, located under the hood next to intake. Hope this helps out.

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2006-05-25 19:20:56
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Q: The blower on your 1995 Olds 88 ONLY works on the top defrost vents for the AC as well as the heater how do you locate and fix the problem?
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