Question about 2000 Lincoln Continental

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When heater is in auto mode, the fan will not adjust speed when temperature is adjusted Manual over ride works ok

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  • Lincoln Master
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Press OFF and FLOOR at the same time, and immediately press AUTO to activate the self diagnostics test mode, and post the code (work for 2001 TC). Also could check this ARTICLE.

Keep in mind that in the auto mode your fan goes up and down according to inside temp... I like to use the fan speed instead i just turn the fan speed dial that cuts off the auto mode. So, the blower speed constantly fluctuates enough to notice? Does it cut out or just change speeds? When on "Auto" the fan speed can change considerably.

The blower motor speed control is solid state, as well as the control head, no relays to mess with. If there is a constant shifting of blower speed, the chances are really good the control head is commanding it to change. The only thing I have ever seen the blower motor speed controller do when faulty is either not let the fan work at all, or keep the fan running all the time.

To be honest, in the shop, I would throw another control head in it, see what happens and diagnose from there (I know that doesn't help). Could be any number of intermittent faulty sensors, temp, sunload etc. Possible bad ground.

Keep us updated.

Posted on Dec 29, 2010

  • ZJ Limited
    ZJ Limited Dec 29, 2010

    Your probable causes here could be the blower motor speed controller or
    the electronic automatic temperature control module behind center of
    dash.

    Your probable causes here could be the blower motor speed controller or
    the electronic automatic temperature control module behind center of
    dash.


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  • Expert
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HI and welcome to FixYa!

As a first course of action I suggest that you remove the positive battery of the car and let it sit for atleast 5mins. then reconnect it again. This can give a jumpstart on the temperature control.

Hope this helps and thank you for using FixYa! Have a good one!

Posted on Dec 29, 2010

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1 Answer

How to disconect the control cables on 1997 geo metro heater control?


does the fan work on high.
yes, then the heater resistor block is burned up. replace that
or look at it to see if the coil there are burned up and gone.
please post systems first, then your guess.
the FSM covers all this, step by step, take apart dash. under
HVAC chapter,.
alldata.com log in and its there.
factory service manual.
removing the control is tricky on all cable cars.
you must get the cables loose before the panel can move out.
the cables all clamped down or they will be dead. (all cars with cables drive)
please post of HIGH speed blower works on high first.
why do this the hard way, at the worst we can use a voltmeter
and prove what is dead, first.

see those rules on cables in the FSM below?
ill not post the panel Remove
  1. Disconnect the negative battery cable.
  2. Remove the heater control unit from the instrument panel.
  3. Remove the mode and temperature control cables at the heater case. Remove the cables from the vehicle.
  4. Remove the fresh/recirculate control cable at blower case and remove from vehicle.
  5. Installation is the reverse of removal.
  6. Adjust the cables prior to attaching at heater control unit.

now lets look at the blower, dead, on all speeds but HIGH , i bet.
?????????????????
this is your cave man simple blower
so if FUSE marked HTR is good, and 12vdc is on both sides of
fuse keyon, then it is good,. and 12vdc lands on motor top
where below on HIGH the blower and switch works on high.
if say the right side resistor blows up, (as all do)
then all lower speed fail. and DC power fails to reach the fan motor.
how is that? clear>?

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Feb 27, 2015 | 1997 Geo Metro

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Started the car and the A/C motor speed went to high and stayes there.


the blower motor resister is bad. go to a mechianic and get it replaced

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Heater blows cold air, engine temperature is normal, no codes displayed


If the heater hoses are hot, the usual problem is a blend door under the dash.

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2004 XG350 - when the outside temperature is in the 40's to low 50's, I set the temperature at 78 degrees and never raise or lower it. The car warms up quickly, but after about 15 - 20 minutes (in my 45...


I also own a 2004 XG 350 and I agree with you. The first thought that comes to mind is a malfunction in the Auto AC control module (that's the virtical console unit which you adjust the fan speed, Auto, Mode, Recirculate, etc. are located). The other thought which occurs to me is that you might have a 'low engine coolant' condition (but that would eventually turn on your "Check Engine Light" and a code would be set indicating the Thermostat was not working properly). Did the Svc Mgr scan your vehicle for any DTC's (Diagnostic Trouble Codes)? If he didn't (or if he didn't have a technician do it), then you'll want to have that done so you'll at least know this may not be the problem. Sometimes the thermostat can stick 'OPEN" and the engine doesn't reach it's operating temperature (which is where you get the heat to warm up the inside of the car)... so, if the engine is 'COLD' so would also be the coolant and it's the coolant that brings the heat into the passenger compartment (via the heater core).

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2006 grand prix heater only blows cold air. both heater hoses are hot blower motor works fine.


Sounds like the temperature blend door actuator may be bad or the vacuum hose to it is disconnected.

Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.
  1. Start the engine.
  2. Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
  3. Set the mode selector to FLOOR mode.
  4. Set the heater control selector to the warmest temperature setting.
  5. Set the blower speed the lowest setting.
  6. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
  7. Set the mode selector to PANEL mode.
  8. Select the maximum blower speed.
  9. Select the warmest temperature setting.
  10. Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
  11. Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
  12. Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
  13. Inspect the temperature door operation. Repair any problems found, go to step 17.
  14. Turn OFF the engine. Back-flush the heater core. Start the engine. Select the FLOOR mode and the lowest blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Is the inlet heater hose feel significantly hotter than the outlet heater hose? If yes, go to the next step. If no, go to step 17.
  15. Replace the heater core. When the repair is completed, go to step 17.
  16. Check for low engine temperature problems, Repair or replace as needed, go to step 17.
  17. Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.

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2 Answers

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Good Evening, If I am translating this properly your fan only works on the high setting? And the other settings do not change the speed? If this is correct respond back and I will help as much as possible.

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What control turn on heat


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