1995 buick lesabre lemited climate control not getting enough heat on the drivers side, cold on pass side

There should be ( 2 ) slide switches or buttons that control passenger/driver side climate control, one of the switches is not operating correctly and probably be faulty. I have a 1991 Buick Regal with the same problem, sometimes i can slide the faulty one real fast to the right and back to the left and it will work fine.

Do some additional research, but they sell a lot of Climate Controls on ebay. 1995-1999 Buick Lesabre, Riviera, Park Ave Digital Climate Control P/N 16181974 (Fits: Buick LeSabre)

Could be a vacuum actuator problem. or just a vacuum leak, period. I have a Jeep that when it has a vac leak, the climate system defaults to the defrost, no matter what you set it at.

My 02 Century has dual temp controls . One for driver for passenger. Make sure you don't have the dual climate enabled and just set for heat on your side and AC on the passengers

THIS IS A GUESS. Both sides probabley have "mix" dampers that regulate temp by mixing hot and cold air to make you comfortable. Passenger side must not work properly, stepper motor? Dirty actuator? Temp sensor on passenger not working? Don't honestly know but I'm not sure a do it yourselfer could figure it out. Sounds complicated.

If you have dual climate control, you most likely have a low freon level. The evaporator can get cold enough for the passenger side (where the evaporator is located), but not cold enough to transfer cold air to the passenger side. Have it inspected for a leak and the freon level topped off.

if car has had dash work vent tubes may not be attached to vent opening if the job wasnt done properly-or tubes may be cracked or missing

Vent door between the two sides isn't opening or the flex hose going between the two is off.

problem with blend door either stuck or linkage problem

yes it is called the blend door, you either have a sticking blend door or the actuator motor for the door is defective and does not completely shut off the heater core. The pass side has it's own blend door.