Call Of The Week - Ron Ananian, The Car Doctor

• Vehicle: 2008 Honda Ridgeline

• Issue: Blower fan and AC stop working after restarting the car (typically after refueling)

• Behavior:

•  

  No blower, no AC compressor

  • Comes back on after driving or waiting

  • Happens intermittently

Most Likely Cause:

• Blower Motor Power Transistor (Resistor Module)

  • Controls blower speed and provides ground

  • Common failure point on this vehicle

  • Failure prevents both blower and AC compressor from working 

Recommended Action:

• Replace the blower motor power transistor

  • Located under dash, by blower housing

  • Use OEM or Denso for reliability

Optional Diagnostics:

• Check for 12V at white/blue wire (blower power)

• Test blue/black wire for ground (from transistor)

• Bypass transistor ground to confirm blower motor works

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