3x Heater Fan Speed A/C Control Knob Switch For 1987-2011 Peterbilt 121-0001-000

Heater Fan Speed A/C Control Knob Switch for Peterbilt

This pack of three climate control knobs is designed to replace worn or broken switches on select heavy-duty trucks, cross-referencing OEM part number 121-0001-000.

Overview

This heater fan speed A/C control knob switch offers a direct replacement for worn-out interior controls. Constructed to restore full tactile feedback, this heater fan speed A/C control knob switch allows users to easily adjust cabin airflow and climate settings. It is designed for truck operators seeking to maintain functional dash controls during long hauls.

Built For Performance

• Molded from durable plastic to resist cracking and wear
• Textured grip surface prevents fingers from slipping during adjustment
• Engineered for a secure friction fit on the original switch shaft
• Clear indicator marking ensures clear visibility of the current setting

Fits These Machines

• for Peterbilt models from 1987 to 2011

On-The-Job Use

• Replacing broken interior climate control knobs in commercial truck cabs
• Restoring full adjustment of the cabin heater and air conditioning blower speeds
• Standardizing fleet vehicle interior controls during routine cabin refits

Specs At A Glance

Good To Know

Q: Are tools required to install these replacement knobs? A: No tools are typically required, as they press directly onto the existing control shafts.

Q: Does this control both heating and cooling functions? A: Yes, it physically turns the switch shaft that regulates fan speed for both systems.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.