Question about 2000 Lincoln LS

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A/C ususally works fine, but occasionally, while it is on and running fine, I will start getting hot air from the passenger-side vents on the dash. That is, the vent close to the passenger door and the right-side one of the two in the center of the dash. This could go on for hours (on a long trip), but usually if the car is off for an hour or so the A/C works fine again. This has happened about 4-5 times in last two months. Any ideas?

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The blend door is probably stuck on the passenger side. Common problem but not an easy DIY job.there are also two different valving setups for the HVAC due to the Driver/Passenger controls. One of these could be malfunctioning. You might have a Dual Coolant Control Valve (DCCV) that is stuck closed, not flowing any coolant through the heater cores.The DCCV is located behind the radiator and low on the passenger side (US) subframe. It isn't too bad of a job if you have the necessary tools. A set of hose pinch-off pliers are very helpful so you don't need to drain the entire cooling system. You'll also find it a lot easier to replace if you put the car on jackstands and can work from underneath as well as from above. It can also be the problem with bad passenger air discharge temperature sensor.The temp sensor is the same as the driver's side air discharge temp sensor and the evaporator discharge air temp sensor. You may want to try swapping the driver's side and passenger side sensors and see if that changes the behavior.The passenger air discharge temp sensor is located in the center plenum. To get to it you need to remove the passenger footwell trim piece which is held in place with two plastic push rivets. Then remove the one 8mm (IIRC) bolt to drop the floor vent. With that removed, stick your head under the dash and look to the center plenum area behind the radio and HVAC controls. The temp sensor will be an off-white color rectangular piece (all that's visible) with a two wire connector plugged in to the top of it. With a small, long flat pocket screwdriver, unplug the wiring then pry the side nearest the radio/HVAC controls away from the plenum. It will pop out slightly, at which time you can reach in and wiggle the sensor out usings a side-to-side motion. Do not twist/rotate the sensor.
There will be two more sensors just like it on the driver's side mounted in the plenum. Access and remove them in a similar fashion.Interchange the sensors and check.If the problem goes then its a sensor problem.Replace the sensor.
The other problem can be vacuum leak.Get it checked.Get the ac drain line checked for any kind of blockage. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 02, 2010

  • jc_44 Aug 02, 2010

    Thanks for the response. First, I want to let you know that there is no way that I'll be doing this myself - I'm a wipers and light bulbs guy, anything trickier is out of my league! I was just trying to get an idea of how serious (expensice) this issue might be. And I am curious about the intermittent nature of the problem: most of the time, the A/C works fine on both sides (and in the rear seat vents) ...

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