Clicking/popping noise from rear a/c-heater unit

to me this sounds like a blend door problem. this is in the heater box, first you need to pinpoint the noise. there is 2 heater boxes on front and a rear both have blend doors. being you hear a noise, I suspect either door is jambed by forign object or broken, but still could be a problem with the actuator for the door. as for the rear not blowing?,check the position of the front blower switch, one position will disable rear function. honestly this
should be done by an experianced technican, I was 20yrs ford.

What kind of noise is it? If it is a "clicking" noise, a common problem on the Expy, you will need to replace the Blend Door Actuator. This is a small unit on the passenger side, rear. When you take the panel off, turn the key on to make the noise so you can locate it (there are actually 2 units) they have plastic gears that strip out, making the clicking noise. To remove the panel to access, you'll have to carefully pop the panel off and remove a couple of bolts around the seatbelt.

ERIC HI I HAD THIS PROBLEM WITH MINE THE REAR END IS A LIMITED SLIP AND BINDS WHEN MAKEING TURNS AS IF IT WAS A TRUE POSI TRACTION REAR CAUSING THE GRINDING OR RUBBING NOISE YOU ARE HEARING I COULD FEEL IT IN MINE IT WAS SO BAD IT ONLY DONE IT WHEN STARING OUT TURNING OR GOING SLOW AROUND SHARP TURNS. TAKE IT TO YOUR LOCAL LUBE SHOP AND HAVE THE OIL CHANGED IN YOUR REAR END AND TELL THEM TO PUT IN THE ADATIVE RECOMENDED FOR THIS REAR END THIS SHOULD TAKE CARE OF YOUR PROBLEM MINE IS TOTALY GONE HOPE THIS HELPS

more thatn likely its one of the rear hvac unit actuators

Try turning the temp control off cold or hot to the rear unit and see if the noise stops. If it does it is most likely the temp blend motor. Also try the same procedure with the vent control for the rear if that stops it it is most likly the vent control motor. Hope this helps.

Fords systems will still blow air even when off. does the clicking get quieter wehn off?

also, you can get it to stop blowing by turning on the recirculator. its a button with a car on it and a u-shapped arrow on the ac controls in dash. IF it stops then then something is in the housing and the fan is hitting it.

You are not going to be happy. There is a servo motor that moves the door. The clicking noise is the little plastic gear stripped. Yes....plastic. And I belive that servo motor is expensive, especially for a plastic gear.

its the rear a/c heater actuator door. The plastic door is wedged or broken. Have it replaced. Hopefully this helps

We just recently purchased a 2000 Expedition. It is wonderful shape but it has started making a ticking noise from under the hood , when you start it. Can anyone help us?

My dealer called it the rear air system's ACTUATOR. Had them replace it and problem was solved.