Last week the 1st speed setting on my heater fan stopped working. A couple days later, the 2nd and then 3rd speed stopped working. As of right now, I only have the 4th/highest speed working. I remember reading somewhere that there is a resistor near the blower motor that could be causing this issue and only the high speed will work if the resistor is blown. But it sounds like a relay switch or something because I lost each speed on different days and not the entire system. I don't know where either the resistor or relay switchis located. Any help would be appreciated. Thanks.

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