2006 Lincoln Zephyr a/c problem freon is at full charge compressor runs normal air blows warm Temp control functions properly. I suspect either a door flap malfunction under dash or expansion valve. Any advice on trcking down the problem?

Only way to tell if A/C Evaporator Core Orifice tube is plugged is by looking at A/C gauge readings , An if it is plugged you more then likely need a new compressor , they become plugged with metal particles from worn out compressor. Your best bet would be to take your vehicle to a qualified repair shop .

The thing to do is have the vehicle hooked up to diagnostic scan tool . Viewing engine sensor data ,see whats off . The computer may think the vehicle is warmer then it is an giving it less fuel . Checking coolant temp sensor data , IAT - intake air temp sensor . 048 Engine Hard to Start or No Start Scan Data for Starting Problems

Low of freon, have it charged to proper lvls with CORRECT freon/refridgerant

My lincoln had the same issue, first it was the A/C compressor (original). I replaced it with another one (used) and worked for 1 month. Then back to hot air. "A/C experts" told me the compressor was out again. I took it to a Mexican auto shop, old building where the guy works alone and to my surprise...HE FOUND THE PROBLEM!! There was no freon leaks, the lines were freezing cold inside the motor, checked freon>>full. He then checked the filter. This filter is on the end of the line where it is crimped that allows the freon to flow thru. Im no mechanic so explaining what it is, forgive me. I can only show you...the line is silver ad in front of you by the radiator, and its the same tube that goes to where you plug it to add freon. There is a filter that was clogged up and prevented the freon from flowing. He removed all the freon, vacuumed out the system/line, and replaced the filter for less that $3.00. Added freon and his cost was $80.00. Thank God for honest people who work hard for a living. I buy the parts, he replaces and I continue to give him my business. Other expensive auto shops with fancy buildings/prices My Lincoln Mark LT now blows arctic cold air!!!

mine does the same

It may still be low on freon. It can hold several cans.
High side should be around 250psi and low around 35 or 45psi at idle if system is charged.
If you raise engine speed the low can drop below 20psi and switch off the compressor if the system is low on freon.
Could be a restriction in the system, bad relay, or bad a/c compressor-clutch.

Hi Nickolas, Im glad to help!

When an A/C system is cycling more then usual it generally means it is low on Freon or you have a cycling switch problem. Call me Al 314-374-5218. The A/C system only needs to see a pressure of around 75 PSI to turn on the compressor but that's not enough to cool the vehicle. Hope this helps and have an awesome day Nickolas.

faulty blend door actuactor.

best bet is to verify thats your problem first. Have a shop check it for you. If it doesnt need freon and you add some you will create other issues. Also if you actually lost freon on a car this new then you have a leak somewhere. Anything you do will just cause more freon to leak into the atmosphere which is a major no no in the Automobile industry. If we released freon we would loose our licence.

Same problem on 2005 Colorado at work. A little research finds that this is a 'gas saving' system. It is designed to cycle often, resulting in less UP time on the compressor, which saves fuel.
HORRIBLE system!
We are going to refill the freon to exact specs and see how the gauges read.
Currently, when compressor is running, a nice cool temp is achieved. But while the compressor is off, the air gets a bit warm. it's 112 out today and this is unsatisfactory.
I found a forum which describes installing a resistor at a certain wire connection in the a/c module. This causes the clutch to engage for longer periods of time. apparently the only real fix at the moment.
I don't have that forum link with me.... so do a bit more research to find it.