Hi,
That is an interesting one because there is only one blend air door regardless of whether it has automatic or manual climate control. The blend door is what controls the air temperature entering the vehicle.
Now, from experience only, I have found the heater cores on these vehicles partially plug causing this type of issue. The concept doesn't make sense because there is only one heater core, but it has fixed several vehicles having the same issues.
Since you are able to check the temperature on the passenger side, that tells me the door is moving as it should. As a result, the first thing I would recommend trying is to flush the heater core.
If you look under the hood, there will be two heater hoses going to the firewall. You will need to drain the radiator, or it will leak out when the hoses are removed.
Go to the parts store and purchase a radiator flush and 2' of heater hose the same size as in your vehicle. Disconnect the hoses at the firewall, install the new hose you have 1' on each side, and using a garden hose, flush water through both ways several times until everything looks clear. Next, using a funnel, pour the flush into the heater core blocking one side and allow it to sit for approximately 10 minutes, then flush it again with a garden hose in both directions to remove the flush. Reinstall the heater hoses and refill the coolant.
With the heater on high, start the engine and allow it to reach operating temperature. Keep an eye on the coolant level in the overflow to make sure it isn't low. Fill as necessary.
Let me know if that takes care of the problem. It should. Also, if you have other questions, let me know.
Take care and Happy New Year.
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Thursday, December 30th, 2021 AT 11:13 PM
