Get your Mechanic to check if there is a Vacuum leak on the hot side that is not closing off on the vent ?
SOURCE: 2004 chevy subarban blows cold air on one side hot air on other side
i was a GM mechanic for many years, the problem you are having is one of your mode door actuators has gone bad, most of the time it is the actuator on the drivers side that causes the problems, i have seen this many times, sometimes you can take it to the dealer and they can hook the computer up to it and recalibrate it but most times it has to be replaced , it is located under the dash in the area above your gas pedal.
SOURCE: Dual Temperature controls inside - 2002 lincoln ls
The problem is most likely a bad dual climate control valve. This component is located on the right side near the radiator under the hood. It will have several coolant hoses hooked to it and 2 silver cylinders protruding from it. You can clamp off the heater hoses at the heater core and see if both sides cool then and this will tell you that the valve is letting coolant thru when it shouldn't be.
This will narrow it down to either the valve or the control head inside the car,or wiring in between them. The only way to narrow it down further is if you have a scan tool that could access the climate control data. Have seen several of these valves cause this concern and have only seen one control head cause it.
SOURCE: even when air is off, hot air comes out all pass side vents
it is the flap door inside the heater box area.alot of gm with electronic climate control have the problem.there is an actuator motor that needs to be replaced.
SOURCE: blower for AC/heat not working on Saab 9-3 ARC
that happened to me there is a i guess u can call it a fan cooler it keeps the fan from overheating and if that blows on a hot day it can mess up your blower moter but if its not workin at all you most likely allready did that for this job the blower moter is located behind the glove box if you not half dumb its a job u can do yourself and save a looooot of money on labor
SOURCE: how do I replace my 2004 Saab 9 3 linear's water pump.
Re : the computer , they better cover it under warranty or they ****.
Re : the water pump , you have a leak and they say it is the water pump , I have no reason to doubt that they have honestly checked out the problem and determined that a new water pump is the only solution but , damn $ 1000 is pretty steep. I would look around for another mechanic for a second opinion and a quote. Avoid dealerships. Not sure what engine you have but i just looked in my saab with a 2.3 and hope I never have to do mine. I am pretty good with a wrench but I know there would be lots of swearing involved.
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