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Heater fan switch issues


old timer 1

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Mar 12, 2016
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Vehicle Year
84 85 87 89
Vehicle
ford
Have an 87 Bll non factory air that's got a heater fan issue. Thought it was the fan switch because when driving home fan just quit but when I moved the heater/fresh air door switch it started working again. So I bought a switch that came with an a/c button on it like my 84 with add on air has. Just ground the rivets off ending up with the switch with 5 connectors I needed. Installed it with same issue no 4 separate speeds just two med and high. Thought then the resister died. Replaced that and the blower motor at the same time. Still have same issue just 2 speeds. What did I miss?
 

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