Question88 Lincoln Town Car.
I have an issue where I only get cold air. Heat used to be lukewarm, but lived with it for the past few years. I now cannot get any temperature variation when I adjust the Slider. Just cold air. I get air from defrost and vents, but do not get any air when I turn it to the HEAT setting. I can feel Hot air when adusting, but it quickly disappears to just cold.
Thank You in advance for your help.
AnswerHi Pat,
I believe it is a bad servo motor. Located in the glove box, it mixs hot air and fresh air to give you the tempeture you desire. This is a round looking guy with a few wires and a vacuum hose or two. Of course, please check all vacuum lines to the unit to make sure you have good vacuum there and no broken or leaking lines if there are problems with the vacuum lines, repairing them will likely take care of this. Part number for the servo motor is E4VY19D669A for $107.63, new at Ford. A good shadetree mechanic should be able to replace it in about an hour.
Here are the instructions on replacement:
Disconnect the ground cable from the battery negative (-) terminal.
Disconnect the glove compartment door stop (one screw) and let the door hang by the hinges.
Servo Motor Assembly
This was were a piture was!
Remove the vacuum hose from the servo motor and unplug the electrical harness connectors.
Remove the two screws from the servo motor assembly mounting bracket and position the servo for access to the vacuum diverter valve.
Remove the retaining push nut and vacuum connector clip, unplug the multiple vacuum connector from the vacuum diverter valve.
Remove the push nut that retains the servo motor overtravel spring and arm link to the blend door crank arm and remove the servo assembly from the vehicle.
INSTALLATION
Connect the servo motor overtravel spring and arm link to the blend door crank arm and install a new push nut.
Connect the multiple vacuum connector to the vacuum diverter valve and secure it with a vacuum connector and a new retaining push nut.
Position the servo motor and install the two mounting screws.
Connect the vacuum hose to the servo motor and connect the electrical connector to the harness.
Replace the glove compartment door stop screw.
Connect the ground cable to the negative (-) battery terminal. NOTE: On vehicles equipped with Electronic Engine Control (EEC) , when the battery has been disconnected and reconnected, some abnormal drive symptoms may occur while the EEC processor relearns its adaptive strategy. The vehicle may need to be driven 10 miles or more to relearn the strategy.
Check the A/C system for proper operation.
Hi Pat and thank you for the tip o' the hat! (nomination) I thought I recognized your name and car. What are you doing to this poor old thing! LOL Just kiddin' anything I can do to help, I'm here for you! Thanks again!
