Antifreeze level is good. I've listened for a vaccum leak, but didn't hear anything. All my vents are opening and closing ok. I'll try to get a piece of hose and listen more carefully around all the connections.
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1987 GMC 1500 5.7L
1985 Chevy 3/4 4X4
2001 Chevy 2500 HD 4X4
2007 Chevy 3500 Duramax 4X4
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