Mobile RV Dewinterization and Spring Startup Service Across Florida

By Jesse Marcer, Founder - Triton RV Repair  |  September 2026

Dewinterization Is More Than Just Flushing Antifreeze

When a Florida coach comes out of storage - whether it sat through a six-month summer absence or through a shorter winter storage period - it has experienced a set of conditions that affect every system, not just the water lines. Battery voltage drops during extended storage as self-discharge, parasitic draws from smoke detectors and propane detectors, and heat-accelerated chemical reactions all reduce battery capacity. Roof sealants dry and contract slightly, sometimes opening micro-gaps at seams that were perfectly sealed at storage time. Slide seals dehydrate in the Florida heat and become less pliable, which means the first extension of a slide after months of storage may not fully compress the seal against the coach body.

The water system flush is the most mechanical part of dewinterization and also the most straightforward. For coaches winterized with antifreeze, the flush requires running water through the system until all traces of pink color are gone from every fixture, then sanitizing with a dilute bleach solution, then re-flushing with clean water. For coaches winterized with compressed air, the flush is simpler - restore water supply, purge air from the lines by running each fixture in sequence, and check for leaks at any fitting that was loosened or stressed during the blow-out process.

The water heater re-light is the step where most dewinterization problems surface. A water heater that has been bypassed and drained since the previous fall needs to be filled, purged of air, and re-lit in the correct sequence. Atwood and Suburban heaters have specific procedures for re-lighting after storage - attempting to light a heater with air in the tank can cause repeated ignition failures that trip the circuit board lockout, requiring a reset procedure before the heater will try again.

Flushing Antifreeze Completely

RV pink antifreeze - propylene glycol - is non-toxic and will not harm gray and black tanks, but it is not pleasant to drink and must be fully removed from the fresh water system before the coach is used. The flush requires running each fixture in sequence from the farthest point from the pump back toward the pump, rather than in random order, to push the antifreeze out systematically rather than mixing it with fresh water across multiple circuits simultaneously.

The water heater requires special attention after an antifreeze-method winterization. Even with a bypass kit installed, some residual antifreeze may remain in the heater inlet and outlet ports. The heater should be filled, allowed to heat, and drained once before being put into service to ensure no antifreeze is left in the tank that could affect the taste of hot water. This extra step takes 20 minutes and eliminates the faint sweetness that some owners notice in their hot water after a first flush without this drain cycle.

The fresh water tank itself is often neglected in the flush process. If the tank was not drained before winterization - which it should have been - it may contain a small amount of antifreeze that dilutes slowly into the fresh water supply over the first days of use. We flush the tank by filling to one-quarter capacity, running the pump to circulate, and draining before the final fill. A tank that was stored dry needs no additional treatment unless it has been open to the environment during storage, in which case we inspect for debris before filling.

System Sanitization After Extended Storage

Any coach stored for 90 days or more benefits from water system sanitization as part of dewinterization. Biofilm - a thin layer of bacteria, algae, and organic matter - develops in any water-bearing surface that is not regularly flushed. The fresh water tank, the pump housing, and the lines leading to fixtures are all susceptible. The distinctive odor that many owners notice when reactivating a coach after summer storage - often described as musty or reminiscent of rotten eggs - is biofilm in the system producing hydrogen sulfide and other metabolic byproducts.

Sanitization uses a chlorine bleach solution at 100 parts per million throughout the fresh water system. At this concentration, the bleach is effective against bacteria and algae without being corrosive to pump diaphragms or PEX tubing at a brief contact time. The solution is introduced through the fresh water fill, circulated through every line and fixture, and allowed to sit for four to eight hours. A thorough re-flush with fresh water then removes all bleach residue. A final taste and odor check at the kitchen faucet confirms the system is ready for use.

Battery Assessment After Storage

Florida summer heat is the primary cause of battery failure in stored RVs. Lead-acid batteries - both flooded and AGM - lose capacity through sulfation when held at low state of charge in warm conditions. A battery that was at 80 percent capacity when the coach went into storage may be at 40 percent capacity when it comes out, having self-discharged and sulfated over months of summer heat exposure. Lithium iron phosphate batteries are more tolerant of storage but are not immune to high-temperature degradation.

We perform a battery load test during dewinterization to determine actual battery capacity rather than assuming the batteries are serviceable. A load test applies a known current draw for 15 seconds and measures voltage under load - a result that cannot be faked by surface charge the way a no-load voltage reading can. A battery that reads 12.6 volts open-circuit but drops below 10.5 under load is sulfated beyond economical recovery. Catching this during dewinterization, before the first trip, allows battery replacement to be scheduled proactively.

LP System Verification Before First Use

A coach that has sat through a Florida summer needs its LP system verified before any propane appliance is lit. The combination of heat cycling and wildlife activity during storage creates specific LP system issues: mud dauber wasps nest in water heater and furnace vents during summer, blocking combustion air paths; UV and heat accelerate flex hose degradation; and the LP detector's semiconductor sensor ages more quickly in sustained high temperatures than its rated service life would suggest. We include a quick LP verification during every dewinterization service - regulator output check, solenoid function test, and a check of water heater and furnace vent paths before those appliances are lit.

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