In most cases on that truck there is a vacum lind that get a hole in it and your blindoor will open and close by it self look undre the hoodin the middle of the firewall nextto the evapbox there will be a vacumhose comeing from the firewallcheck tosee if its hooked up andif its sealed good
Need A LITTLE more info about what its doing is it when you first turn the ac on or is it all the time
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