Question about Cars & Trucks
Driving down the road, the a/c on just the driver's side of my Lincoln MKZ abruptly starts blowing super-hot air. Passenger side continues to cool.
Posted by Anonymous on
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Posted on Jan 02, 2017
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.
Posted on Apr 02, 2009
I had the same problem when i was working on my 1999 Buick Regal and had to disconnect the battery. I didn't reconnect in the same way that I disconnected the battery from the terminal and noticed that the driver side had no heat or air but the passenger side did. I then disconnected the battery again and reconnected it the same way and now have heat and air on both the driver and passenger side. Hope this helps. Good Luck!
Posted on Apr 26, 2009
Damper/flap for driver's side is probably stuck. Try moving the selector from cold to hot several times. Also, move the recirc/outside air control if the previous doesn't work.
Posted on Jun 01, 2009
The actuator has gone bad. They can be programed, and reset, but usaly they are bad, and that will only patch the problem for a while.
Posted on Jun 19, 2009
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