1997 GMC Savana 1500 Q&A

1997 GMC Savana 1500 Question: rear a/c

i have a 1997 gmc savanna 1500 5.0l v8. the front air is working fine but the rear air is blowing out hot air. i check the fuse and it was OK. is there a fuse somewhere just for the rear i don't know about, or could there be another problem? -
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