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Does the vehicle have dual zone climate control, where the driver side and passenger side have different control? Sounds like a blend door issue on the driver side. Why did you replace the passenger side, was it blowing hot too when AC was on?
Check the actuator motor on the heater it directs the air into the vents. There is probably two of them be sure to check both. The motor makes the vents move and again directs the air where you want. Hope this helps.
Blend doors control flow between hot and cold airflow . In a dual system both sides have their own separate blend doors . Possible bad switch, connection or wiring that need checking out .
Have same issue with my xc70 cold to coolish on drivers side and warm to hot on pass... slowly, with driving, pass side becomes cool. Slight swoosh sound from dash attributed to A/C is intermittent. Thought to be kinked tube or puncture? : (
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
If your LS is blowing hot air on one side of the dash and cold on the other the problem most likely is the Dual Coolant Control Valve. The DCCV is used to control cabin temperature. This valve is mounted down low on the passenger side of the radiator fan shroud, and has 3 coolant hoses connected to it. This valve if found to be faulty will need to be replaced to correct the condition.
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.
I had the same issue, where the driver side blew hot and passenger side cold. Took it to the dealer and they charge me 6oo dollars to change the air actuator value. This value (next to radiator) is what controls the coolant flow for the dual climate control. After having this done and looking at the change, I became more than a bit Agitated.... A thought occurred to me that a radiator flush would have resolved the issue and saved me 600 dollars. What lead me to that conclusion are two things
1) Mechanic said when he clamped of the other side of he value the issue resolved itself meaning the value was not bad. 2) This issue only happen after I turned on the heater for the first time this season...
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