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November 6, 2025 Service bulletin

In some geographic areas, ambient temperatures reaching below 15°F (-10 °C), including high levels of...

Workhorse technical service bulletin IK1201009 for 2011 Workhorse W22, 2013 Holiday Rambler Endeavor and 2013 Holiday Rambler Ambassador and others.

Bulletin number
IK1201009
Component
Structure: body
Summary
In some geographic areas, ambient temperatures reaching below 15°F (-10 °C), including high levels of humidity, an operator may experience engine stalling, low performance, and or poor aftertreatment performance. This is caused by condensation accumulating and freezing within the Charge Air Cooler (CAC); affecting air flow into the engine. This article lists all the currently available winter front covers that can be installed on the front grille and bumper to reduce cold air flow to the engine compartment.

Owners of these vehicles have filed 16 complaints in the body category.

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