Having problems with your Thunderbird’s Climate Control System?

2002 dash:consoleAre you having problems with the climate control system on your 2002-2005 Thunderbird? Is it blowing only hot air? Causes for problems with the climate control system  fall into one of several categories:

(1)  Defective A/C compressor

(2)  A/C compressor is low on refrigerant

(3) the ‘blend doors’ inside the dashboard are jammed either in the open or closed position,

(4) the electronic controls of the unit itself are not functioning properly.

Before you take your Thunderbird to the dealer or independent repair shop, try this step to unstick the plenums or ‘blend doors:’  Using the temperature control toggle switches on each side of the unit, press the up position to the highest temperature setting and hold for 30 seconds.  Then hold the switch in the ‘down’ or lowest temperature setting and hold for 30 seconds.  Repeat this process on each side of the dual climate control unit  twice.  This procedure can reset or ‘unstick’ the blend doors mechanically.

If this reset doesn’t solve the problem, have your shop or Ford dealer verify that the A/C system has sufficient refrigerant.  Refrigerant can degrade, evaporate or leak, and you may only need a ‘top off’ to get your A/C system blowing cold again.  This is a lot less expensive than a new A/C compressor, so be sure your mechanic or dealer checks that first before you pay for an expensive compressor replacement.  There may also be a leak in one or more of the A/C system hoses.  Have those checked also.

Climate Control Self Diagnosis

The climate control unit  can also perform a self-diagnosis and will display various codes that will help isolate the problem. Here are instructions on running the system’s self diagnosis along with the codes and possible sources:

Turn key to on position. Push the OFF and FLOOR buttons at the same time. Then push AUTO within 2 seconds. The module will do a self test and show and faults on the display.  The code consists of four digits and the  display scrolls from 1 to 22 on the left and various numbers on the right. During the test the system recalibrates the mode for the  door actuators and sometimes will resolve this particular problem.

Run-Time (Intermittent) Faults or Self-Test (Hard) Faults Description Action to Take
B1242 1242 Air flow recirculation door driver circuit failure GO to Pinpoint Test C.
B1251 1251 Air temperature internal sensor circuit open GO to Pinpoint Test D.
B1253 1253 Air temperature internal sensor circuit short to ground GO to Pinpoint Test D.
B1255 1255 Air temperature external sensor circuit open GO to Pinpoint Test F.
B1257 1257 Air temperature external sensor circuit short to ground GO to Pinpoint Test F.
B1259 1259 Solar radiation sensor circuit open GO to Pinpoint Test G.
B1261 1261 Solar radiation sensor circuit short to ground GO to Pinpoint Test G.
B1262 1262 Servo motor defrost circuit failure GO to Pinpoint Test C.
B1263 1263 Servo motor vent circuit failure GO to Pinpoint Test C.
B1264 1264 Servo motor floor circuit failure GO to Pinpoint Test C.
B1265 1265 Servo motor cold air bypass circuit failure INSPECT the vehicle for the presence of a cold air bypass door actuator. If a cold air bypass door actuator is present, GO to Pinpoint Test C. If a cold air bypass door actuator is not present, ignore DTC B1265.
B1342 1342 ECU is defective INSTALL a new DATC module.
B1676 1676 Battery voltage out of range REFER to Section 414-00.
B1946 1946 Climate control A/C post evaporator sensor circuit failure GO to Pinpoint Test E.
B1947 1947 Climate control A/C post evaporator sensor circuit short to ground GO to Pinpoint Test E.
B1966 1966 A/C post heater sensor driver side circuit failure GO to Pinpoint Test E.
B1967 1967 A/C post heater sensor driver side circuit short to ground GO to Pinpoint Test E.
B2428 2428 A/C post heater sensor passenger side circuit failure GO to Pinpoint Test E.
B2429 2429 A/C post heater sensor passenger side circuit short to ground GO to Pinpoint Test E.
B2797 2797 Driver coolant control valve open circuit GO to Pinpoint Test J.
B2798 2798 Driver coolant control valve circuit short to ground GO to Pinpoint Test H.
B2799 2799 Passenger coolant control valve open circuit GO to Pinpoint Test J.
B2800 2800 Passenger coolant control valve circuit short to ground

 

If the refrigerant level is normal, and the compressor is working, and there are no leaks in the system, the problem may be the in-dash climate control unit itself.  Once the other possible sources of the problem have been ruled out, have your dealer or mechanic determine if the problem is the control unit.  If so, the unit will need to be repaired/reconditioned.  Again, your Ford dealer doesn’t perform electronic repairs in house.  They will remove the defective unit and send it to an  outside automotive electronic specialist for repair.  The mark-ups on outsourced repairs can vary widely.  Get an itemized estimate for parts and labor before you authorize repairs.

For more information on our Dual Climate Control Repair Service, click here: http://www.thunderbirdspecialties.com/shop/2002-2005-thunderbird-oem-climate-control-unit-repair/

 

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