Degowget Heater & A/C Control Switch for Peterbilt Q21-6012 — Direct Replacement, Plug-and-Play

Degowget Q21-6012 is a direct-replacement heater and air-conditioning control switch engineered to restore reliable HVAC operation in compatible Peterbilt trucks.

If your Peterbilt cab has unresponsive climate knobs, inconsistent fan speeds, or intermittent temperature control, this Degowget control switch provides a plug-and-play solution designed to meet original-equipment fit and function. It replaces the factory climate control module on specific Peterbilt models and model years, bringing back predictable heating and cooling without costly diagnostic downtime.

Which Peterbilt models and years does this control switch fit?

This control assembly is compatible with a wide range of Peterbilt models across multiple production years. Confirm the part number Q21-6012 (also shown as Q216012) against your truck VIN or existing panel before ordering to ensure exact fitment.

• Fits Peterbilt 325 and 330 model years 2011–2020
• Fits 335, 337, 348 series for overlapping years; see vehicle specifics
• Compatible with 357 (2006–2007), 378 and 379 (2006–2010)
• Works with 365, 367, 388 ranges (2006–2020) and 385, 386 (2006–2015)
• Also fits 384 (2008–2015) and 389 (2006–2024)

How does this replacement improve my HVAC performance?

The Degowget module replaces worn or failed controls that cause unsteady fan operation, nonresponsive temperature adjustments, or stuck mode selections. With restored circuitry and properly labeled controls, the driver regains simple, deterministic control over cabin climate.

• Restores accurate fan speed and mode selection
• Brings predictable temperature response to the HVAC system
• Eliminates common electrical faults in aging control panels
• Plug-and-play design reduces installation time

What are the product specifications and quality assurances?

Degowget manufactures this climate control switch to rigorous standards and subjects each unit to quality checks to ensure reliable operation comparable to OEM performance. The part is identified by numbers Q21-6012 and Q216012—verify these against your existing part before purchase.

• Part numbers: Q21-6012 / Q216012
• Manufactured to meet strict OEM-like quality controls
• Pre-tested for electrical continuity and button responsiveness
• Backed by a one-year warranty from Degowget

How simple is installation and what should I check first?

Installation is typically straightforward for anyone familiar with dash panels and truck wiring—most replacements use the existing mounting points and connector harness. Before starting, power down the vehicle and compare the old module to the Degowget unit to confirm connector type and part number match.

• Power vehicle down and disconnect battery before handling
• Compare connector pins and housing to ensure compatibility
• Use basic hand tools to remove trim and secure the new unit
• Test all functions before reassembling dash trim

Who is this for: This control switch is intended for fleet managers, owner-operators, and truck maintenance professionals who need a reliable, cost-effective replacement for malfunctioning Peterbilt HVAC controls. It’s ideal for those who want a high-quality aftermarket module that mirrors OEM fit and function and includes a one-year warranty for peace of mind.