Hot water problem
Sounds like you may have either corrosion or loose flake restrictions in the hot water shut-off valve or the hot water side of the faucet bodies or in both.
A single-handle Delta most likely has a ball with seats-and-springs (not a cartridge), and the hot water side on both faucets could be blocked from debris (diptube? scale?) from your water heater (most likely) or hot water line (possibly).
I would turn the water off and remove handles from any sink hot water shut-off valves, wrap a towel around them and have someone open the water very briefly to flush out any loose scale. If that doesn't do it, dismantle the faucets themselves (water off), put a towel over the sink faucet (no need for tub) and briefly turn the water on to flush the faucet bodies.
While you have the shut-off valves and faucet bodies dismantled, check the washers on the valves and the rubber seats-and-springs in the faucets, and replace them all unless they're relatively new. They're inexpensive. I use Delta repair parts only, as some of that generic stuff doesn't work as well.
Last edited by Mike Swearingen; 09-20-2007 at 03:44 AM.