As New Zealand rolls into the colder, wetter months, motorhome and caravan owners face a crucial seasonal task: winter maintenance. Whether you’re tucking your vehicle away until spring or braving the scenic South Island in frostier conditions, winterising your motorhome is essential for protecting your investment – and your future adventures.
Over my 22 years of repairing motorhomes and now inspecting pre-owned RVs, I can tell within minutes which vehicles have been properly maintained through winter – and which haven’t. Common signs of neglect include rotting floorboards, mould and mildew, electrical issues, deteriorated seals, and even pest infestations.
The good news? Most of these issues are preventable with a bit of preparation and routine care.
Here’s everything you need to know to get your RV ready for winter, stay on top of maintenance, and avoid those nasty surprises when it’s time to hit the road again.
Why Winter Maintenance Matters
New Zealand winters are no joke, especially for RVs. Heavy rain, fluctuating temperatures, and high humidity all create perfect conditions for moisture build-up. If left unchecked, that damp can lead to everything from musty smells and mould to serious structural damage.
But moisture isn’t your only enemy. Sitting idle over winter can lead to flat batteries, tyre damage, and stiff or cracked seals. Long periods without movement or ventilation can cause materials to deteriorate faster than you’d think. Whether you’re parking up for the season or just scaling back your travel, giving your vehicle the right care over winter is the best insurance policy you’ll ever take out.
Start with a Pre-Winter Check
Aim to do your first comprehensive winter check at the start of the cold season – King’s Birthday weekend is a great time to make this an annual ritual. Then, set a recurring reminder on your phone to repeat a simple monthly check through the winter.
Use the checklist below to stay on track. It’s designed to be practical and New Zealand-specific, based on what I see in the field every day.
Your Winter Maintenance Checklist
Exterior & Structural Care
- Inspect for leaks: Carefully check the roof (especially around hatches or solar panel installs), windows, vents, and awnings. Soft spots or hairline cracks in sealant could let water in.
- Roof check after first rain: This is key! New leaks often appear after recent roof work. Don’t wait until spring to find the damage.
- Clean and wax: A protective wax coat can help guard against rain, dirt and even sea spray if you’re coastal.
- Use a breathable RV cover: Choose one designed for RVs – not a plastic tarp, which traps moisture.
- Keep storage space clear: Remove leaves or long grass around the RV to discourage pests.
- Check for rodents: Look for signs of nesting under the bonnet, in ventilation areas, or near wheel wells.
Moisture Prevention
- Drain water systems: Fully empty fresh, grey, and black water tanks. Don’t forget to run the pump and open taps.
- Drain water heaters: And leave taps open to avoid pressure build-up or trapped moisture.
- Interior checks: Inspect for dampness, musty odours, or surface condensation – especially under mattresses or in storage lockers.
- Ventilation matters: Crack open a vent or window slightly. Use moisture absorbers or a portable dehumidifier inside the cabin.
Battery & Electrical
- Remove or trickle-charge the battery: A flat battery is a common winter casualty. If you’re not using the vehicle, take it out and store it somewhere warm and dry, or leave it connected to a trickle charger.
- Turn off all appliances: Don’t leave any part of the electrical system running. Isolate power to avoid parasitic drains.
Check solar systems: If you have solar panels, make sure they’re clean and getting enough light to maintain battery charge (especially in the far south).
Tyres & Suspension
- Inflate to spec: Cold weather causes air to contract, leading to lower pressure.
- Rotate or move vehicle monthly: This helps prevent flat spots and keeps suspension components moving.
- Use levelling blocks: This takes stress off the tyres and helps avoid uneven pressure distribution if parked long-term.
Interior Prep
- Empty the fridge: Defrost and clean thoroughly. Leave the door slightly ajar with a towel to absorb any drips.
- Remove perishables and fabrics: Store bedding, towels, food, and toiletries elsewhere to prevent mould and deter pests.
- Pest prevention: A few sachets of peppermint oil or citrus peels can help deter rodents. Avoid traps unless you check regularly.
Monthly Winter Routine
It’s not just about packing your motorhome away once and forgetting about it. A regular check-in can save thousands in the long run. Once a month:
- Remove the cover
- Wash the exterior (especially the roof)
- Open all windows and hatches
- Run the heating, water, and appliances for an hour
- Check battery voltage and tyre pressure
- Air out all cupboards, lockers, and storage areas
- This doesn’t have to take more than an hour, and it’s a good excuse to get out and dream about your next trip.
Keep a Maintenance Log
This one’s often overlooked, but it’s invaluable. Use a basic notebook or a digital log to record:
- Dates of checks and maintenance done
- Battery voltage readings
- Tyre pressure
- Any issues noted and repairs made
Keeping a detailed maintenance log not only helps you stay on top of seasonal upkeep, but it also adds real value when it’s time to sell. A well-documented, well-cared-for RV is far more appealing to buyers and can command a higher price.
With many Kiwis starting their search for a second-hand motorhome in late winter or early spring – keen to gear up for summer adventures – you’ll be ahead of the game if your RV has been properly maintained over the colder months. It also gives buyers confidence, especially at a time of year when it’s easier to spot signs of leaks or wear after a season of rain and rough weather.
Final Thoughts
Taking the time to winterise your RV isn’t just about avoiding damage, it’s about peace of mind. It ensures you’re not dealing with costly repairs when you could be planning your next roadie. Whether you’re parking up under a tree in Taupō or storing your van near the coast in Kaikōura, a little preparation now pays big dividends down the track.
Remember: roofs are the most neglected part of RVs, and the most common source of expensive damage. Check them early, check them often.
By making winter maintenance part of your yearly routine, you’re not just looking after your vehicle, you’re investing in all the journeys still to come.
Happy wintering! And here’s to dry floorboards, strong batteries, and mould-free mattresses when spring rolls around.
