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Discussion Starter #1
I recently replaced the heater core in my 89 foxbody, once I attempted to use the heater the fan knob was completely loose even though I had it connected. I attempted to search for an answer but haven’t found anything. The knob is in great condition but idk what the issue could be.
 

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Remove the HVAC panel and investigate if the fan knob was damaged. The fan speed switch is electrical in nature, so it's possible it was physically damaged.

None of us have the part in hand, so we can't say how it was damaged. You either need to post pics or assess yourself
 

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Update I did damage the knob and the connector for it so I’m gonna order it from LMR. Though I do have another issue, I went to hook up my after market stereo and it turns on and everything is connected tho I don’t have any sound coming through the speakers now
 
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