What is your question?
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What is your question?
trying to work in all setting except 'high'. Just no air comes out through the vents. I suspect I need a resister for the fan motor at the minimum, but what would stop all air flow through the vents>
1 Reply
blowing out the defrost and floor vents. Not the dash vents. Further symptom: the fan seems to run on all settings except high.
you have a vacuum leak under the hood.check the smaller vacuum lines at the firewall,passenger side first.start the truck,turn the a/c on high or medium,listen for hissing sounds.if needed run your hand around the vacuum hoses to find the leak,repair the hose.then after you repair the hose/hoses.when you have a vacuum leak,the blower will default to the defrost and floor vent MODE!check all settings on the blower after repairing,low,,medium,high.post findings!