Hey guys, so over the summer my parents got their kitchen redone in an older home. During the freezing cold temps last week my mom tells me their sink is clogged and has no idea why. I tried plunging it but that didn't work. I took the p trap out and it wasn't clogged there either. It's a double sink and I checked to make sure everything up to the p trap isn't clogged. Apparently my dad tried to feed a snake through but I'm not sure how far he got. The house is a bungalow, all the other drains and toilets in the house work as well as all the water supply lines.
Yesterday i took out the dishwasher to see if there was another section of pipe I could remove to check if the clog was there but the pvc pipe and sections/bends seem to be welded together.
My mom seems to be convinced the drain pipe is frozen. It's never happened in the house before and I'm pretty sure the contractors that redid the kitchen didn't mess with the piping other than add the new sink and p trap in. Is there any way to test if it indeed is frozen and not just clogged somewhere deeper down the line? If it is frozen what can they do besides wait for summer?
Thanks in advance guys. Any help is greatly appreciated