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Car overheats unless Climate Control Button is turned on

Upon starting my 2000 Lincoln LS, the car will overheat unless I turn on the climate control button and allow air to come out of the blower. The problem wont occur if the car is idling after the start up. I can idle for a half hour if I want, but once I start to drive and put "demand" on the engine, within a few minutes, the temp gauge will shoot up and the engine warning system will kick on telling you it's decreasing engine power. I immediately stop the car, remove the key, wait for 60 seconds or so and then re-start the car and typically there is no further problem. To avoid the problem to begin with, I must turn on the climate control and call for air (regardless of whether I need cool air in summer or warm air in winter) I can usually turn off the fan after a few minutes of driving and the problem doesn't return. The dealer checked the coolant system and found no leaks. I've had the car checked for air pockets and no luck. The problem occurs on a regular basis but not at every instance of starting the car although the safest startup procedure is to turn on the AC fan after start up.

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You have a bad fan relay for the secondary fan. Have it replaced and that should fix the problem. Good luck.

Posted on Oct 07, 2009

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1994 Lincoln mark 8 Chnged alternater n it said to plug n memory before you unplug the battery n alternater now my ac isnt really cold n only blows out top vents


You might want to try turning the climate control temp settings all the way down. Then turn the system OFF. Disconnect the negative battery terminal and let the car sit for 5 to 10 minutes. When time is up reconnect the battery and then start the car. Turn on the Heat/AC and adjust the temp setting.

Sometimes this works on cars with computer controlled climate control systems.

Good luck.

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2000 lincoln ls...Car dies and acts up untill it warms up


There can be several things that could cause this concern on a LS and coil packs are certainly one of them. However since the problem is more previlant when turning on climate control I would think problem may be the dual climate control valve is shorting out.The e popping up on your gear indicator is telling me that the network is getting knocked off line, kinda like your home computer rebooting during a lightning storm.
You can do a self test on the climate control,use the follwing sequence.
Front Panel DATC Module Display—Retrieve Continuous Diagnostic Trouble Codes (DTCs)
Continuous DTCs are fault codes recorded by the DATC module which have occurred during normal operation. For the DATC module this means that all faults (intermittent or hard) that occur while the module is in an operational state shall be reported as a continuous DTC.
  • To retrieve continuous DTCs, press the OFF and PANEL buttons simultaneously, followed by pressing the AUTO button within two seconds.
  • The DATC module will report all continuous DTCs to the vacuum fluorescent (VF) display.
  • The DATC module will not carry out a self-test; it will only display continuous faults codes which are stored in memory.
  • All VF display segments will light if no faults are detected.
  • Individual continuous DTCs will be reported with the °C symbol lit.
  • DTCs shall be reported as a four-digit DTC (less the alpha character).
  • Pressing the front defrost button will exit the retrieve continuous DTCs mode and clear all continuous DTCs from DATC module memory.
  • Pressing any other button (other than DEFROST) will exit the retrieve continuous DTCs mode and maintain all continuous DTCs in DATC module memory.
  • Upon exit from the retrieve continuous DTCs mode the DATC module returns to operational status. The DATC module executes a hard (cold boot) reset which places the DATC system in the OFF mode.
If you hav e code 2798 or a 2800 then I would say this is definetly your concern and I would replace the dual climate control valve. it is located on the passenger side of vehicle next to the radiator,you will see coolant hoses going to it from the heater core.

Feb 17, 2009 | 2000 Lincoln LS

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