Key takeaways
- Treat any forecast of 34°F or below as a freeze night. Exposed lines freeze before the air hits 32°F.
- Walk the tunnel with a written checklist: drain, heat-trace, weep valves, pit heaters and the exit apron.
- Store concentrates above 40°F and off the floor. Frozen chemistry may not perform after it thaws.
- Make the close-or-open call by 3 p.m. the day before, and tell staff and members the same way every time.
Most Southeast operators don’t think of themselves as cold-weather washes, and most of the year we aren’t. But every winter brings a handful of nights, sometimes three, sometimes a dozen, when temperatures drop into the 20s. Those few nights cause more damage per hour than anything else on the calendar: cracked manifolds, split hoses, frozen pumps, and a sheet of ice at the tunnel exit that turns a slow Tuesday into an insurance claim.
The good news is that freeze damage is almost entirely preventable. It just takes a plan that’s written down before the first cold front, not improvised at 10 p.m.
1. Define a freeze night, then stick to it
Pick a trigger and make it automatic. We use 34°F on the overnight forecast, not 32°F. Wind, low spots and exposed piping mean equipment can freeze before the official temperature does. When the forecast hits the trigger, the freeze plan runs. No debate, no judgment calls from whoever happens to be closing.
2. Walk the tunnel with a checklist
Every tunnel is different, so build your list with your equipment provider. Most will include these steps:
- Drain and blow out lines that can’t be heated, especially arch feeds and anything near the entrance and exit doors.
- Check heat trace and pit heaters before the season, not the night of. A breaker that tripped in March won’t announce itself in December.
- Open weep valves or set low-flow bleeds where your manufacturer recommends them.
- Close doors and check that door seals and heaters work.
- Treat the exit apron and lot with ice melt that’s safe for concrete.
“Freeze damage is almost entirely preventable. It just takes a plan that’s written down before the first cold front.”
3. Protect your chemistry
Chemicals are easy to forget until they fail. Many concentrates separate or lose performance after they freeze and thaw, and you won’t know until the cars come out dirty. Keep drums and totes in a room that stays above the manufacturer’s minimum, usually around 40°F. Keep them off the slab and away from overhead doors. If something does freeze, call your chemical supplier before you put it back in the system.
4. Staffing on cold days
Cold mornings are slow and cold afternoons can surge. Decide in advance who gets cut, who comes in late, and who is on call if the tunnel goes down. Make the close-or-delay decision by 3 p.m. the day before, and send it to staff, and to your unlimited members if you close, through the same channel every time. Consistency builds trust faster than perfect forecasting.
Safety matters more than throughput. Give your attendants traction cleats, a warm place to rotate through, and clear authority to shut the entrance if the exit is icing.
5. After the freeze
Don’t just flip the switch at opening. Walk the tunnel again, look for leaks and cracked fittings, run each arch empty before the first car, and log what you found. That log becomes next year’s checklist.
A few cold nights don’t have to cost you a week of revenue. Write the plan, assign the owner, and run it the same way every time.
FAQ
When should a Southeast tunnel start freeze protection?
Plan for any night forecast at 34°F or below, not just 32°F. Exposed lines, pits and pump rooms can freeze before the official air temperature does.
How should car wash chemicals be stored in winter?
Keep concentrates in a space that stays above the manufacturer's minimum, usually 40°F, off the floor, and away from doors. Frozen and thawed chemistry can separate and stop performing.
Should a car wash close on freeze nights?
Many Southeast operators close early or delay opening when the tunnel exit or lot could ice. A clear call by 3 p.m. the day before keeps staff and customers safe.