26sonic

how do you winterize the AC unit and also the fres water holding tanks for the toilet, and sinks ?

t500hps

pink RV antifreeze.
run all the water you can out of the holding tank, put in 3 gallons of pink antifreeze and run each faucet until it has run pink for 20-30 seconds. (remember transom shower if you have one)

Pump holding tank as best you can.....fill with several gaollons of water and pump again (flushing the "flushings". Pour 2 gallons of pink antifreeze down the toilet and flush as required. (remember to run the macerator (if aplicable) to fill those lines with antifreeze)

AC: open sea strainer if you can get the AC to run while a constant suply of antifreeze is poured in the sea strainer then do that. If not...... I remove the water line from behind the pump and use an air compressor to blow the water out the lines (forward and backward) Will use 2 gallons of antifreeze.

Ted G

You need about 2 gallons of the pink stuff. Pull the feed hose off the water tank and let it drain, now stuff it in a bottle of pink, turn on the pump and run it through the sink. Leave the tank basically empty. Same thing with the AC. Close the thru hull, pull the hose, stuff it in a bottle of pink. Turn the AC on so it pumps the bottle down, when pink comes out the side of the boat, you're done. Don't forget to run your transom shower also if you have one.