09 columbia htr mtr fuse location

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On a 2009 Freightliner Columbia, the main heater/blower motor fuse is located inside the main fuse panel behind the glove box on the passenger side dashboard. [1]
The critical detail to note is that the blower motor fuse is typically not labeled on the fuse diagram. [1, 2]

Specific Fuse Positions to Check:
Look at the lower-left side of the fuse panel (in the same row as the relays): [1]

• 30 Amp Fuse: This is the dedicated fuse for the cab blower motor. It is often plugged into what looks like an unmarked micro-relay socket slot rather than a standard fuse line. [1, 2]
• 5 Amp Fuse: This sits right next to or staggered with the 30A fuse and controls the HVAC control head / dashboard module. Note: If this 5A fuse blows, the entire climate system (including the blower) will die. [1, 2]
• 20 Amp Yellow Maxi-Fuse: Usually labeled "HVAC", but this controls the A/C compressor clutch, not the fan. [1]