Sounds like You're not driving the car up, so its mlt'ing (los). Go through your up section and t/s to see what is preventing an up run or an up run in leveling. I would look at your up limit sw's first. Then check to see if bypass is set correct (size the valve) On new installs lately or mods guys are just throwing the valve in as is. The other possibility but not likely is your thermal overload opening. Check the temp of the m/r and oil.
