Finally Spring - but oh what a mistake

[BaysideBruce]

Okay, last Fall I thought the dealer had winterized the PU.  I was wrong.  Now that it's Spring and warmer, how would you start looking for the leaks in the plumbing?  Should I hook it up to the city water and start there, or should I start with the holding tank and try out the pump?  Anything I should do before I even start looking for leaks?  Any suggestions on where to look of "hidden" leaks that may not be obvious??
Thanks!

[ForestCreature]

I'd start with the holding tank, the tank itself should be fine (you did drain the system right?) run the water for a bit (both hot and cold)  and check the pump and the faucets, if all that is good move to the city water.  If water was left in the lines I'd trace them all down and look carefully for cracks while the water is running.
 
 If you had drained the system and ran the pump and faucets dry, you may get off lucky. Good luck.

[JUST4FUN]

you may want to look at the j traps in the waste lines under the sink
and shower (if you have one) if there was water i ther it will crack

[Old Goat]

I have had the water lines on our 01 Niagara freeze twice, once while camping when the temp dropped to 9 degrees. The only thing that was damaged was the galley faucet which was plastic and it cracked. Dealer wanted about $35.00 for a replacement also made of plastic. I found a used one in a junk shop for two bucks. It is all brass and chrome plated and  looks new after cleaning up....The water lines on Coleman trailers are Pex, a very strong 3/8" plastic tubing with brass fittings. I have not had any leaks with them freezing. The water in the sink trap can freeze but it has room to expand at each end and should not cause any damage..........