Question about 2004 Lincoln LS

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Why cannot get power to my dcc unit

My heater and ac unit doesnot have any power to the on off switch

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Check the thermal blower lockout switch located in the heater inlet hose. To check for a faulty thermal blower lockout switch, remove the connector from the switch and check for continuity through switch with engine warm. Check the condition of the vacuum lines and electrical connections before and after the switch.

Posted on May 02, 2015

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Heater doesnot work at all


Check to see if your AC system has been converted, take the case off of your AC fan and see if it is bend in any way, that would explain it not rotating. After you get it running you may need to replace your heating coils. I have the same problem but haven't had time to fix it. these are just my thoughts on what could be wrong.

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CHECK BLOWER MOTOR FUSE AND RELAY.SEE IF POWER GOING TO BLOWER MOTOR YOU HAVE FAULTY BLOWER MOTOR.IF BLOWER MOTOR FUSE AND RELAY OKAY.IF NO POWER GOING TO BLOWER MOTOR BUT POWER AT AC AND HEATER CONTROL SWITCH. BLOWER MOTOR HAS POOR GROUND OR AC AND HEATER CONTROL SWITCH IS BAD.

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I currently have two problems: The first is a minor pain, but, the fan on the ac/heater only operates on the two high settings. I've heard that there is a solenoid on the firewall that controls this...


Hi,
the simplest way to clear the AC issue, is to visit your local auto parts store and they will show you an 'exploded' diagram of the AC system and it's components. If you speak nicely they may well show you the actual controller. for the fan speeds.

The other method is to visit your local library and check a Mitchell repair manual, You can see the circuit wiring for the AC speed control /mode switch.

It sounds as if the control switch for the drivers window has malfunctioned. They, because they are used so mjuch, are generally the first to give problems.

If you remove the window operating switch unit, (very carefully) and remove the plug in control wires. Check the switch if it is held together by 4 small tangs. If so it is possible to very carefully separate the unit, and clean the internal contact with a glass "emery" (I know, a contradiction in terms) board which women use to shape their nails. Being made of glass paper, it will not leave a residue as emery cloth does. Assemble the switch and plug the power plug into the switch. Power on and operate the window. If successful your window will now operate. Refit the switch unit in it's original position. If the switch fails to power the window, I am afraid that your next choice will be a salvage yard, an auto parts store, or a dealership.

Prior to doing the above. It may be possible that the passengers side window operating switch , will swap out with the drivers window unit. Some do,....and some don't! It would be your call as to whether you try it.

Good luck.

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Yeah, your magnetic AC fly wheel doesnot work, need to replace the switch. Take to an AC repair shop, not for tree shade mechanics to do. Good?

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May be the heater/AC control unit in the dash.The heat stays on the floor because the door actuater moter is not switching direction of air flow and as far as the warm air,if you engine is up to operating temp,then the heater control valve is not opening fully.Both are conected to the heater/AC control unit.

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You have clean the blower unit , may be its dirty then . and then check the blower resistor unit for malfunction.

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check to see if AC and HEATER blower motor is getting power .if yes replace blower motor.if no you have problems in relay- fuse- or ac and heater switch is bad.for sun roof check for power at switch if yes sun roof eletric motor need replace.or sun roof in a bind.if no power to sun roof switch.blowed fuses and bulbs or turn signal switch is bad.

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I had the same prblem. There is a relay next to the heater blower that needs to be replaced.

Apr 09, 2009 | 1996 Nissan Sentra

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