Winter care for your caravan


So, you’ve had your last caravanning trip of the season and it’s time to put your unit into hibernation until spring. No matter where you store it, there are lots of things you can do to ensure that everything is in good working order when you get it out again for next season’s touring.

A caravan is a big investment, so here at Winchester Caravans we want to make sure your caravan journey keeps on going for years to come.

Winter care

Much of this relates to draining down water systems to prevent any possible damage from icing, ensuring best possible ventilation around the ‘van, and checking the internal and external fabric is set-up for long-term storage. As well as the cold, other climate factors to be aware of include damp and even air pollution.

Also, we would like to offer advice on tyres, security and other issues. All of this is based on common sense and tried-and-trusted techniques found to work when putting your caravan away over the winter. Follow these simple procedures and you’re well on the way to trouble-free caravanning the following season.

Looking after Your bodywork

Preparing the exterior of your caravan prior to winter will certainly pay dividends the following spring. Irrespective of whether you intend to use a cover or overwintering wax coating to help protect your ‘van, a thorough cleaning is essential. Thorough cleaning of the body also provides the opportunity to inspect the bodywork for any kind of damage as the winter season is a good time to get it fixed when our workshops are less busy.

Always use proprietary caravan cleaning agents that are designed to be kind to the various materials used in caravan construction. Beware the use of pressure washers. These are often powerful and can direct spray under trim and damage bodywork and seals. Pay particular attention to removing any signs of green or black mould, if left to grow over winter it may create conditions where the aluminium or plastic surface is permanently marked if left to grow over winter.

Also, take a personal-safety-first approach to cleaning your caravan. Be careful about stretching and using ladders, especially when it comes to cleaning the roof, which might not appreciate your weight on it!

Of course, there are other external aspects to consider - 

  • Tyres – these do not like standing around on the same piece of tread for long periods
  • Consider turning the wheels, say every six to eight weeks and raise the pressure to help alleviate any problems, but don’t forget to drop the pressures down when you go on the road. Ideally shield the tyres from sunlight to help prevent degradation of the rubber but avoid using plastic bags that seal the wheel and bearings and may cause condensation in the hub. Winter wheels (special clamps instead of wheels) can be used, but they do not meet the required criteria for some caravan insurance policies, so check first
  • Security – remember to fit hitchlocks, wheelclamps and the like, especially if required by your insurer. If nothing else, these act as a visual deterrent.
  • On older caravans, exterior light fittings can benefit from the removal of the lens, a quick clean of the seals and lens (inside and out) and the checking of any electrical connections, before replacement.
  • Check your 13-pin or 12N and 12S (7-pin) car-to-caravan connectors for any signs of wear or damage.
  • Ideally, store your caravan with all corner steadies down and the handbrake off, to prevent it sticking. Use wheel chocks if necessary.
  • Apply grease to any moving mechanical parts or linkages, such as corner steadies’ rotating screws and the spare wheel carrier

Caravan Electrics    

Interior Actions -

  • Vacuum clean and wash down your caravan’s interior throughout. As well as getting
    everything clean, it’s a great way of checking you don’t leave anything untoward in a cupboard or seat base. Creating best possible air circulation is the key to keeping your interior damp free.
  • Cleaning the kitchen thoroughly should prevent any mould appearing here, although for the fridge it is also essential to leave the door ajar – there is usually a special catch provided for this purpose. Use products designed for caravan use, rather than normal domestic cleaning fluids, as these may cause damage to surfaces and seals in a caravan.
  • Cushions are best left standing up away from the walls after vacuuming. This helps aid air circulation and prevents mildew occurring, especially in units with solid ply bed bases (as opposed to slats).  A further measure to keep upholstery in top condition is to cover with a breathable material such as old cotton sheets to keep the dust off. Ideally if you have room, store cushions at home in the warm, which is also a deterrent against caravan theft
  • Fixed beds are best left in the open position. Again, this aids air circulation.
  • For blinds with any kind of spring mechanism, it’s best to leave them open, otherwise the springs are gradually stretched over a period of time and subsequently fail to work efficiently.
  • Leaving locker and wardrobe doors open optimises ventilation.
  • Make sure all rooflights and windows are fully closed.
  • Lightly coat hinges with thin oil or water dispersant such as WD-40 to protect against rust, taking care to avoid contact with door surfaces.


Water Systems - 

Draining down is the best form of protection from frost damage, but it is important to ensure the system is fully emptied, just a small amount of water trapped in a tap head can cause costly damage.

Drain down procedure:

  • Start by opening all taps (for mixer taps ensure the lever is in the central position to allow both hot and cold to drain).
  • Open all drain valves and remove any drainage plugs (keeping them in a safe place), not forgetting the external plug for older water heaters.
  • The shower head is best removed and shakenfree of water.
  • If you have an internal water tank, it should have some means of drainage and/or removal.
  • Remove any filters and save them for when you sterilise the system in spring (some sterilisation treatment damages the filter) and then replace.
  • If you have an on-board pump, run it for a few moments to clear it of water, most good pumps can be run dry for a minute or so without any problem, check your handbook for details. Your external submersible pump can be shaken free of water.
  • Don't forget your Aquaroll or other portable water container, drain it and allow it to dry out thoroughly to prevent mould growth.
  • Finally, one of the more effective ways of achieving full drain down is to empty the system on your last stay on site and leaving any drainage points open before towing home. The final journey allows the last drops of water to leave the system. Be aware, however, that it is illegal to discharge water on to the highway.

  Open Tap  Waste Outlets  Filter

Toilet Duties - 

  • If your caravan has a cassette toilet, this should be thoroughly drained and cleaned before storing over winter.
  • Drain the flushing water tank via the drain tube, if it's provided, or flush as much water as you can through the system and into the cassette waste tank.
  • Remove the waste tank, empty and clean it out.
  • Clean and wipe the valve blade sealing the toilet from the waste tank with an appropriate seal lubricant (or silicon lubricant, but do not use petroleum jelly or any vegetable oil except olive oil). Manufacturers often also advise leaving this valve in the partially-open position for storage purposes to prevent it sticking shut. This is also a good opportunity to clean and lubricate other rubber seals in the cassette to ensure they remain supple. 

Electrics - 

Having the ability to hook up your caravan to a 230V electricity supply throughout winter can have advantages, not least the fact that you can power up any systems, such as the heating, from time to time, as well as keeping items like the battery in tip-top condition. For many, however, this is not an option and you need to consider alternatives.

Leisure batteries are often among the casualties of long periods without use. If left in the unit, ensure the battery is kept fully charged and isolated from all 12V equipment by means of the unit's isolation switch or disconnect it. Alternatively, ensure all interior electrical items are in the off position and disconnect any plugs. Don't forget the TV aerial booster in the cupboard, if fitted. Anything left on standby mode is still draining the battery, even the voltmeter on the control panel.

Remember, even when disconnected a battery will discharge over time and once left in a discharged state its storage capacity can never be fully restored.

If feasible, disconnect the battery and take it home where you can charge it periodically. A battery should not be left much more than six weeks before re-charging less if the battery needs to remain connected to operate a security system. If your caravan has a tracker or other security system this needs a source of power, which will probably mean leaving your caravan battery in situ and finding a way of charging it on-site or having a substitute battery. Wherever you keep your battery, clean over the terminals and smear them with petroleum jelly.

Gas Systems - 

Wherever you're storing your caravan, it is essential that the gas valves on top of the cylinders are closed or the regulators (if a clip-on type) are disconnected from the cylinders and caps or cloths are fitted over the ends of any open pipework.

If you're putting your unit into storage, check with the storage operator regarding its gas cylinder policies. Some don't allow you to store cylinders with your unit for any length of time. If you can store the cylinders in the dedicated gas locker of your unit so much the better. Alternatively, they should be stored in the open air in a secure place. Storing in a shed or garage is not recommended as in the case of a fire the fire service will be unaware of presence of the cylinders, whereas a fire in or near to a caravan or motorhome immediately suggests the likely presence of gas cylinders.

Wherever they are located, cylinders should be stored at least two metres from open drains, openings into cellars (LPG being heavier than air) or buildings. The cylinders should also be kept away from heat and readily-ignitable materials and corrosive, toxic or oxidant materials. When removed from the unit's gas locker, plastic caps or plugs should be fitted to the gas cylinder's outlet. When handling, connecting and disconnecting gas cylinders ensure engines and electrical equipment are switched off.

Covering up - 

To help preserve the exterior of your unit and ease the chore of cleaning it before your first spring outing you may wish to consider either a breathable cover or the use of a protective coating, such as Fenwicks Overwintering Fluid.

When choosing a cover it's important for it to be breathable, soft enough not to damage the caravan surface and tough enough for longevity. The alternative of a waxy protective coating has the advantage of low cost and if you leave it on all winter it is relatively easy to wash off in spring because of the natural degradation of the coating. All caravan covers have a limited life, but some inferior products can last little more than one season. The main problem is ultra-violet light degradation. Consider the cover as sacrificial, it's better the cover degrades than your GRP panels discolouring.

If you use your cover throughout the year and so expose it to summer sun, consider a lighter colour to help reduce heat build-up. Also expect its life expectancy to reduce. Generally, you get what you pay for here, from cheap imported products right up to premium, custom-made items  not only are the custom made a much better fit the quality and workmanship is superior. Do ensure it's the right size for your van with the doorway in the right location and provision for the protruding external fittings such as a roof aerial and gas flue. Another life-shortening aspect of caravan construction to covers is the sharp ends of aluminium awning rails and roof joint strips. The cover needs to be protected at such points with robust material to prevent premature wear. Before fitting a cover it is essential that the surface of the unit is clean and dry, otherwise even with the softest of covers a surface layer of dirt and grit will damage your paintwork as the cover moves against the side of the unit.

Take particular care to ensure the windows are clean as the soft acrylic material scratches easily.

Ignore any advice to protect the windows with cling film before fitting the cover as this is not wise and may cause cracking to the windows.

We hope you find the above information useful, If you have any questions and need help with the care of your caravan please do not hesitate in contacting one of the Aftersales team at Winchester Caravans.

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