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I hate to do this but I have this posted on the full size van forum but that place is like dead, just doesn't have the people the superduty section has so if anyone can help I would appreciate it. I know a lot of people on this forum have extensive electrical background maybe some one can help me out. Here is my post from the van forum.
Hi guys, I've been struggling with this issue for a while, only have high fan for the front heat, rear heat works fine. I have a new resister block in it, and tried the one out of my superduty which I know is good, and replaced the switch. Found no melted wires that I could see but can't get the fan to work on low and medium settings. Any help would be appreciated. Thanks This is as my sig shows a 99 E250 Hi Top conversion van.