This morning when I was running to the store I turned on my air conditioner it ran for about a minute and then shut off. Turned it back on and immediately shut off. This repeated for 5 or 6 times. After it would start I would try to turn the temperature down it would shut off again... finally once I got moving some it finally stayed on. It doesn't do this all of the time only very randomly... (once or twice in the last year) does anyone have any ideas what could be wrong? 2005 King Ranch

 

May just need charged. It sounds like it is low on freon, but just barely low.

 

Low on freon wouldn't shut it off.

 

Does your truck have the electric fans? The fan not working would explain why it works when driving.

If no electric fan check your fan clutch

 

Yeah mine will blow warm sometimes at idle because earlier models don't have the Efans.

 

http://www.ford-trucks.com/forums/98...self-test.html

Try this...

 

Thanks for the input guys! I will check this stuff out when I get off today!

 

just for the record:

HVAC MODULE - EATC ON-DEMAND SELF TEST

The HVAC Module - EATC On-Demand Self Test will retrieve on-demand (hard fault) DTCs only, it will not retrieve continuous DTCs. Continuous DTCs can be cleared when exiting the HVAC Module - EATC On-Demand Self Test. Make sure to retrieve continuous DTCs by carrying out the HVAC Module - EATC - Retrieve Continuous DTCs procedure before clearing any continuous DTCs.

• The HVAC Module - EATC On-Demand Self Test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A scan tool must be used to retrieve these concerns.
• The HVAC Module - EATC On-Demand Self Test will detect concerns in the system control functions and will display on-demand (hard fault) DTCs for concerns that are present during the self-test. The vehicle interior temperature should be between 4°C-38°C (40°F-100°F) when carrying out the self-test. If the temperatures are not within the specified ranges, false DTCs may be displayed.
• The self-test can be initiated after cycling the ignition switch from OFF to ON. Normal operation of the climate control system stops when the self-test is activated.
• To enter the self-test, press the OFF and DEFROST buttons simultaneously and release, then press the AUTO button within 2 seconds . The display will show a flashing blower icon for 20 seconds , after which all vacuum fluorescent segments will be displayed if there are no on-demand DTCs present. If DTCs are present, the HVAC module - EATC will display "00 00" and then on-demand DTCs. Record all DTCs displayed.
• If any DTCs appear during the self-test, carry out the diagnostic procedure. Refer to the HVAC Module DTC Chart and follow the ACTION for each DTC given. See: Diagnostic Trouble Code Tests and Associated Procedures\HVAC Module DTC Chart
• If a condition exists, but no DTCs appear during the self-test, GO to Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Incorrect Operation. See: Symptom Related Diagnostic Procedures
• To exit the self-test and retain all DTCs, press any button except DEFROST. The HVAC module - EATC will exit the self-test and retain all DTCs.
• To exit the self-test and clear all DTCs, press the DEFROST button. The HVAC module - EATC will exit the self-test and all DTCs will be cleared.
• Always exit the self-test before powering the system down (system turned OFF). Once the self-test is exited, the ignition switch must remain ON for at least 30 seconds to allow the door actuators to automatically recalibrate.
• Continuous DTCs will be deleted after 80 ignition switch ON cycles after the intermittent fault occurs.

 

Okay I did the self test and it showed a 13 and 42. I tried to go to that website that was listed but it said it was down. Any ideas what these numbers mean?

 

here is some detail on that chart:
http://www.justanswer.com/ford/5wb8i...rols-does.html
and here:
http://www.justanswer.com/uploads/mu...31926_1121.pdf

and from that B1342 means:
B1342 1342 ECU Is Faulted INSTALL a new HVAC module — EATC. REFER to Section 412-01.
or
B1342 EMTC Module Faulted INSTALL a new EMTC module. REFER to Section 412-01.

reading in the web, some people unplug it, clean and reconnected and it work... so... you may want to try that first... you may get lucky.
some other say that to reset the computer, which could mean to disconnect the battery, then turn on the headlights to remove residual power, wait some minutes, then reconnect...
or.. you may need to reprogram it. are you using an edge or another tuner?