Pre-purchase inspection checklist — 2003 Thor California Wanderer
The 2003 Thor California Wanderer has key safety concerns related to exhaust and furnace systems. It's crucial to verify that these systems have been properly addressed, as they pose carbon monoxide dangers. A single tire complaint suggests few widespread tire issues but remain cautious.
Known issues to inspect
Furnace exhaust vent leaked gases
How to check: Inspect furnace exhaust vent installation and odor signs.
Tailpipe not long enough
How to check: Verify tailpipe extends beyond trailer base.
Test-drive walkthrough
- 01
Before starting
What to check: Inspect furnace vent and tailpipe.
Red flag: Visible signs of poor installation
- 02
Cold start
What to check: Look for fumes around generator.
Red flag: Noticeable exhaust smell
- 03
First minute idling
What to check: Listen for unusual noises from exhaust.
Red flag: Audible leaks or fumes
- 04
Initial acceleration
What to check: Sensitivity to exhaust issues.
Red flag: Persistent exhaust smell
- 05
Stopping the vehicle
What to check: Finalize checks for leaks or fumes.
Red flag: Strong odor near exhaust
Questions for the seller
Use this exact phrasing.
- Has the furnace vent been fixed?
- Is the tailpipe extended sufficiently?
- Were there any exhaust-related incidents?
- Any modifications to the furnace?
- How often coolant systems were checked?
Documents to request
Don't sign anything until you have these.
- Furnace installation records
- Exhaust modification proof
- Maintenance history
- Accident report
- Safety recall completion
Generated by gpt-4o on 8/24/2026. Grounded in the NHTSA recall corpus and owner-complaint patterns for the 2003 Thor California Wanderer.