To Whom It May Concern:
Recently, all of the illumination in my HVAC control head died. It was still functional, but I couldn't see it at night. I figured it was my fault - I probably damaged or broke something on the backside of the old control head when I was shoving it and a fire hazard's worth of audio wiring into my dash. So, I decided to replace the old and malfunctional $85 Amazon-bought unit with something "premium" from RockAuto - I prefer parts my Standard Brand (not their T-series) and don't mind paying for such quality. $200 later, I have a brand new, fully functional AND brightly lit HVAC control unit carefully installed in my dash.
Two days later, the unthinkable happens. The system stops blowing air. I thought the two-year-old blower motor died. So, I replaced it - to no avail. Followed by the high-speed relay and the blower motor resistor. Still, nothing. It was not until I changed the blower motor switch in the new HVAC control head that a hint of functionality returned - the new blower motor started blowing on High.
Neither the connector nor the wires for the blower motor switch show signs of excessive current. I cannot visually find any discolored wires or connectors anywhere. I broke out my DMM and did find that the Lo, Med-Lo and Med-High blower motor switch positions have 0 volts present at the positive connector for the blower motor while the only working position, High, has full system voltage.
I'm not sure what could be wrong and where said problem is located. As such, I would certainly appreciate some help and guidance in bringing my HVAC system back to full functionality. Thank you for your time.
- southidesmoka
Recently, all of the illumination in my HVAC control head died. It was still functional, but I couldn't see it at night. I figured it was my fault - I probably damaged or broke something on the backside of the old control head when I was shoving it and a fire hazard's worth of audio wiring into my dash. So, I decided to replace the old and malfunctional $85 Amazon-bought unit with something "premium" from RockAuto - I prefer parts my Standard Brand (not their T-series) and don't mind paying for such quality. $200 later, I have a brand new, fully functional AND brightly lit HVAC control unit carefully installed in my dash.
Two days later, the unthinkable happens. The system stops blowing air. I thought the two-year-old blower motor died. So, I replaced it - to no avail. Followed by the high-speed relay and the blower motor resistor. Still, nothing. It was not until I changed the blower motor switch in the new HVAC control head that a hint of functionality returned - the new blower motor started blowing on High.
Neither the connector nor the wires for the blower motor switch show signs of excessive current. I cannot visually find any discolored wires or connectors anywhere. I broke out my DMM and did find that the Lo, Med-Lo and Med-High blower motor switch positions have 0 volts present at the positive connector for the blower motor while the only working position, High, has full system voltage.
I'm not sure what could be wrong and where said problem is located. As such, I would certainly appreciate some help and guidance in bringing my HVAC system back to full functionality. Thank you for your time.
- southidesmoka
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