Air Conditioning - hot liquid line

What would make the liquid line hot leaving the condencing unit?
The coils were cleaned,the fan motor is new.

If the unit seems to be running ok I would suggest washing out the condensing coil. It needs to be washed thoroughly with a garden hose. The preferable method is from the inside of the coil spraying outwards. Wash every square inch of the coil making sure the water is flowing easily between the coil fins, spraying it without really cleaning it is just wasting water. Have a friend that said he cleaned his condensing coil but still wasn't cooling well. It took me an hour to wash it properly. Also hot weather conditions will cause a hot liquid line but a cleaning can't hurt.

Depends on the age of the unit, and SEER rating.

Older/lower SEER unit has less coil area to cool the liquid down to air temp, where newer/higher SEER unit has a lot more coil area, and the liquid has a chance to cool down to air temp.

If the unit is on a hot roof/side of the home, the line will be hotter than normal.

Those reply posts are very good.

If you live where there are cottonwood trees or the condenser is near a clothes dryer vent it could be plugged with cottonwood or lint from the dryer.

Take the temperature of a top air discharge (not a table top type) condenser & then subtract the temperature of the small liquid line, that's the Subcooling temp, which ball-parked should be 10 or 12-F.;)
- HVAC RETIRED

What would make the liquid line hot leaving the condencing unit?

Its supposed to be warm/hot - not cold, if thats what you were thinking.