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Campaign 21V522 Posted July 8, 2021 521 units

2019-2021 Thor Motor Coach RV Recall 21V522: Window Defect

RN
Reviewed by the RecallNotify editorial team
Published May 20, 2026

Recall 21V522 affects 521 2019-2021 Thor Motor Coach RVs for window adhesive failure. Repair is free at any franchised Thor Motor Coach dealer.

Thor Motor Coach is recalling 521 2019-2021 Challenger, Palazzo, Tuscany, Miramar, Aria, Outlaw, and Venetian motorhomes equipped with Hehr 6400 series windows because the adhesive holding the vented window section can fail. If that vent section detaches, it increases the risk of a crash or injury; Thor Motor Coach dealers will inspect and repair the windows free of charge.

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What's wrong?

The Hehr 6400 Series vented window on these 2019-2021 Thor Motor Coach Challenger, Palazzo, Tuscany, Miramar, Aria, Outlaw, and Venetian recreational vehicles is the window assembly with an operating vent. That vent lets air move through the coach while the glass and seals stay bonded in place, keeping the opening closed and weather sealed when latched.

On affected motorhomes, stress can break down the adhesive bond in the vented portion of the window. The bond is what holds the glass panes and vent structure together. Once that bond weakens, the vented glass section is no longer held with the intended strength. Thor Motor Coach says the corrected part uses an adhesive-backed glass spacer and a different secondary sealant to increase bond strength between the panes of glass.

Owners can notice this during regular maintenance as visible separation or loss of bonding around the vented window. That is the warning sign to report before the window bond gets worse.

Who's affected?

Covers 7 Thor Motor Coach RV lines from 2019, 2020, and 2021, all tied to 6400 Series vented windows.

2020 Thor Motor Coach Outlaw body or structural component
2019 Thor Motor Coach Tuscany Recreational vehicle/trailer
2019 Thor Motor Coach Tuscany body or structural component
2019 Thor Motor Coach Venetian Recreational vehicle/trailer
2019 Thor Motor Coach Venetian body or structural component
Units affected521
Field incidentsNHTSA has logged no field incidents to date.

The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific RV is included.

What's the safety risk?

In NHTSA campaign 21V522, adhesive failure can let the vent portion of the window detach, increasing the risk of a crash or injury. Treat loose glass or visible bonding loss as a reason to schedule the inspection soon. Repair is free at any franchised Thor Motor Coach dealer.

What should I do?

  1. Check your VIN to confirm your 2019-2021 Thor Motor Coach Outlaw, Tuscany, Venetian, Aria, Palazzo, Challenger, or Miramar is included in this recall.
  2. Contact a franchised Thor Motor Coach dealer to schedule the free Hehr 6400 window inspection and vent replacement if the adhesive has failed.
  3. Bring the recall notice if you have it, and reference recall number 21V522 when you call.
  4. Drive cautiously until the inspection and repair are complete, since the vented window portion can detach if the adhesive fails.

What happens at the repair

At the dealer, a Thor Motor Coach technician inspects the Hehr 6400 series windows and checks whether the vented portion is still bonded correctly. If a window vent is loose or the adhesive has failed, the technician replaces the vent. The inspection, replacement parts, and labor are free under the recall. Thor Motor Coach has a general reimbursement plan on file, so documented out-of-pocket repairs for this same window vent condition are handled through that plan. Bring related repair paperwork to the service desk.

ReimbursementReimbursement available

Timeline

July 8, 2021 NHTSA published the recall
September 8, 2021 Dealer notification began
September 8, 2021 Dealer notification ended
September 8, 2021 Owner notification mailed
September 8, 2021 Interim owner notification (was planned for this date)

Frequently asked questions

What is recall 21V522?

Recall 21V522 covers 521 2019-2021 Thor Motor Coach Outlaw, Tuscany, Venetian, Aria, Palazzo, Challenger, and Miramar RVs with Hehr 6400 series windows. The adhesive bonding the vented window section can fail, letting the vent detach and increasing crash or injury risk.

What should I do if my 2019-2021 Thor Motor Coach RV is on this recall?

Check your VIN to confirm your specific RV is included in recall 21V522. If it is, contact a franchised Thor Motor Coach dealer to schedule the window inspection. The dealer will replace the vent if needed, free of charge. Reference recall RC000232 when you call.

Is the recall repair free?

Yes. Federal recall law requires the manufacturer to repair the defect at no cost. Thor Motor Coach dealers will inspect the Hehr 6400 series windows and replace the vent if necessary, free of charge.

What is the safety risk in recall 21V522?

The safety risk is a window vent detaching from the RV. In NHTSA campaign 21V522, Thor Motor Coach reported that failed adhesive can let the vented portion of the Hehr 6400 series window separate, increasing the risk of a crash or injury.

What if I bought my Thor Motor Coach RV used?

The free recall repair still applies. Recall coverage follows the vehicle, not the first owner. Check your VIN to confirm whether your specific RV is included, then call a franchised Thor Motor Coach dealer and reference recall 21V522 or Thor Motor Coach recall RC000232.

More information

NHTSA campaign pagenhtsa.gov/vehicle-recalls/21V522000
Thor Motor Coach customer service1-877-855-2867
NHTSA recall #21V522
NHTSA recall # (full)21V522000

Source documents

This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →