forgot to winterize and it went to 21 last night

open low level drains, throw some RV antifreeee in your black tank, and down your sinks, shower, etc You should be fine as long as it doesn't stay below freezing level for a long period of time. If you are able you can put a portable heater in your rig and set it to 60 degrees or even cooler that will help as well.

Fill wh back up. Turn it on. Let hw flow into lines every few hours. Keep rig heated as much as possible.

I guess I was looking for ideas on damage already done.. antifreeze is on order and will be here monday. I live in the south so it was probably below freezing for around 4-6 hours and same tonight.

put a heater in there open cabinet doors you should be ok.

barchetta1 wrote:
I guess I was looking for ideas on damage already done..

You said 'avoid'

21 isn't cold. Just heating the rig a bit and opening the cabinets should prevent any issues. Check for broken traps but you're likely just fine. I camped in colder temps elk hunting a few weeks ago.

Almost everyone sells RV antifreeze. No need for a compressor.

If you were only below freezing for several hours, you are fine.

Well, hoping for the best. Its 33 already and its only 7pm. I suppose i could go get some windshield washer and add that to the drains anyway.

Put a space or 2 inside. They are cheap and abundant this time of year. Any WM or Dollar General will have them.

If you are not willing to do that for some reason, do the following:

Drain the water system and water heater.

Go to Walmart and get some RV antifreeze. I know you are not far from a WM in SC.

Pump the antifreeze through the water lines until they all run pink. Pour some in the traps and toilet.