"How did my water pipes freeze and crack?" "The battery had power when I parked — how is it dead after sitting for a while?" Questions like these are raised by a handful of users after every winter. These problems may seem coincidental, but they stem from a systematic neglect of winter-specific characteristics. Today, we will walk you through three major scenarios — pre-parking, during use, and long-term storage — to give you an item-by-item winter maintenance checklist you can actually execute.

Exterior Inspection and Cleaning

Start with a comprehensive and thorough exterior cleaning of your slide in camper, including washing the exterior walls and, if possible, the undercarriage. Use a sponge or soft cloth with a mild acrylic glass cleaner to gently clean the windows and roof skylights. Maintain the rubber weatherstripping on doors and windows to prevent aging or cracking in low temperatures.

Tire and Jack Maintenance. Tire pressure drops with temperature (by 7-10 kPa for every 10°C decrease). Check monthly and reinflate to the standard value (typically 280-320 kPa). For jacks, hydraulic jack fluid may solidify below -20°C. Use low-temperature hydraulic fluid, or switch to mechanical screw jacks.

For slide in campers with slide-out rooms, ensure they are fully retracted before parking. For pop-top slide in campers, the roof must be lowered. Keep the awning closed, and promptly clear away dust, dead leaves, and debris from all surfaces during long-term parking to prevent mechanisms from sticking or malfunctioning when you use them again the following season.

The final step is to park the vehicle on a level surface. If the ground is uneven, use leveling blocks or ramp pads to adjust. Some slide in campers are equipped with electric auto-leveling jacks, making this even easier. If possible, park the camper in a covered space. If that is not an option, use a dust cover to keep the freshly cleaned exterior from getting dirty again.

Interior Inspection and Cleaning — Fully Draining the Water System Is the Core of Winterization

Water freezes at 0°C and expands by 9% in volume — enough to crack interior water pipes, fresh water tanks, pump fittings, and other components. Therefore, draining the water system is the top priority for freeze protection. The specific draining procedure is as follows:

Shut off the external water supply and open all faucets (including shower, kitchen, and bathroom). Turn on the water pump to flush out residual water from the lines until the flow becomes intermittent. Open the drain valve at the bottom of the fresh water tank (typically located at the undercarriage service port) and fully drain the tank. Disconnect the inlet and outlet hoses of the water heater and tilt the vehicle to assist drainage (some models may require manual shaking). Pour in food-grade antifreeze (not automotive antifreeze) — approximately 4-6 liters — and circulate it through the pump until pink fluid appears at every outlet. Close all faucets to prevent evaporation. Important note: if food-grade antifreeze is not added (never use alcohol as a substitute), residual water in the lines can easily freeze and cause damage, and repair costs can be significant. To resolve residual water issues, simply use an air compressor to blow out the lines.

Kitchen area: Clear out all food supplies — this prevents mice and insects from finding a food source. Defrost and thoroughly clean the refrigerator (if needed, install winter vent covers for the ventilation openings). Use a towel or dry cloth to prop open the refrigerator and freezer doors, keeping them in an open position. Clean the kitchen area and stove.

Living and sleeping areas: Use a mild cleaner (such as diluted mild soapy water) to clean the furniture. If possible, remove all textile items and store them indoors. To improve air circulation, stand cushions upright or elevate them from underneath — this helps prevent mold. For fixed beds, open the storage box beneath the bed or stand the mattress upright. Empty all storage cabinets and keep doors and compartments open as much as possible. Remove all moisture-absorbing materials (carpets, clothing, bedding, towels, paper, toilet paper, etc.).

Electrical System: Lithium Battery Performance Drops Sharply in Low Temperatures

While LiFePO4 batteries have become the preferred choice for slide in campers in recent years, lead-acid batteries are still widely used due to their lower cost. However, it's important to note that LiFePO4 capacity drops by 30%-50% below 0°C, and charging may become impossible at -10°C.

Some slide in campers are equipped with BMS systems featuring low-temperature protection — for example, a -20°C low-temperature heating pad that automatically preheats the battery before charging. If no heating function is available, it is recommended to bring the battery indoors, or use a dedicated insulation sleeve with a self-regulating heating tape (power ≤ 50W to avoid overheating). Also, avoid deep discharging: in winter, recharge promptly when the charge drops below 30% to prevent permanent battery failure caused by the combined damage of low temperature and low charge.

Long-Term Storage Is Not Simply "Cover and Forget"

Winter in the north lasts a long time — typically around 4 months — so you cannot simply "cover and forget." Regular inspections are still necessary. For example: disconnect the main power switch and, after fully charging the battery, disconnect the negative terminal. Fully drain the water system and add antifreeze. Leave doors and windows with a 5mm gap for ventilation to prevent interior frost and mold. Lower the pop-top roof and cover with a waterproof tarp (do not use plastic film, as it traps condensation). Place wooden blocks under the chassis tires to keep them off the ground and prevent rubber aging. Release the parking brake, and ideally cover the tires to block direct sunlight.

Important Note: Do not store your slide in camper long-term in a sealed, enclosed garage. Trapped moisture inside the vehicle cannot escape, which can easily lead to mold on wall panels and corrosion of electrical circuits.