Question about 1998 Lincoln Mark VIII

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No heater or air conditioning is it the heater control valve or possibly climate control?

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I had the same problem. It turned out that the small gray plastic lever arm that opens the mixer door was broken. The big problem with this is that to access this arm and mixer door, you have to remove the dash. You can feel and see the lever by dropping the glove compartment all the way and reaching to the front and left. It was a pain to replace, but well worth it.....

Posted on Oct 15, 2008

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I replaced the heat blend actuator because I was not getting any heat. Now, after replacing, all I get is hot air and no cold. The A/C was working fine just before replacing.


Do you have Manual Climate Control System or Dual Automatic Temperature Control System ?
The temperature control switch:
  • is a potentiometer that outputs a variable voltage to the temperature blend door actuator to set the position of the temperature blend door.
  • initiates closing of the heater control valve. When set to full COOL, a lever on the temperature blend door pivot shaft depresses the pintle of the heater control valve vacuum switch. The heater control valve vacuum switch then applies vacuum to the heater control valve, closing off engine coolant flow to the heater core.
  • is serviced only with the climate control assembly.
You may have disturbed something when changing the actuator , the vacuum switch o vacuum hose .

Oct 21, 2015 | 2005 Ford Explorer XLT

1 Answer

A/c is not working, was told it was a module or something on the heater box, would you know what they are talking about and how much to fix?


Without knowing any specifics, it sounds like it is the climate control box, which is a valve that diverts the air flow over the heater core to give you heat, then when you want air conditioning , a valve moves a baffle to divert the fan air to pass over the A/C evaporator coil located in the car cabin.

The bad news is all this climate control valves and mini radiators are underneath the dash and there is a lot of labor getting the stuff out, especially if it needs replaced. You might luck out and it is just a linkage rod became disconnected. But count on at least 500 bucks if there is disassembly needed

Feb 26, 2015 | Cars & Trucks

1 Answer

My heat want get hot but it blows


For one reason or another your heater core is not recieving any circulation. It could be a frozen heater switch valve or ( diverter valve ). That is located in line under the hood on one of the heater hoses running into the firewall. Check it for operation. If that is okay check for plug in heater hose or a pinched condition of supply lines. If the blower blows but you dont feel any air movement then the
air control gates under the dash arent working. They are vacuum controlled and hoses get old and crack and break or pulled so check all the vacuum elements on the climate control center under the dash. If you feel air but not from the vents then a length of duct work came disconnected or it cracked somewhere.

Nov 18, 2010 | 1988 Lincoln Town Car

1 Answer

How to replace a heater core


Heater Core Removal & Installation Front To Remove:
  1. Make sure you have the anti-theft codes for the audio and the navigation system, and then write down the audio presets.
  2. Disconnect the negative cable from the battery.
  3. From under the hood, disconnect the heater valve cable from the heater valve. Turn the heater valve arm to the fully opened position.
  4. When the engine is cool, drain the engine coolant from the radiator.
  5. Disconnect the inlet heater hose and the outlet heater hose from the heater core.
  6. Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines, the brake lines, and related parts.
  7. Remove the dashboard.
  8. Remove the evaporator.
  9. Remove the mounting bolts and remove the heater unit. Front heater unit honda-10-00-4128.gif

  10. Remove the self-tapping screws and the clamp.
  11. Carefully pull out the heater core so you don't bend the inlet and outlet pipes.
Front heater core honda-10-00-4129.gif

To Install:
  1. Using care, install the heater core to the heater unit and secure.
  2. Using care, install the heater unit and tighten mounting nuts and bolts to 7 ft-lb (10 Nm).
  3. Install the evaporator.
  4. Install the dashboard.
  5. Connect the inlet heater hose and the outlet heater hose to the heater core.
  6. Connect the heater valve cable to the heater valve.
  7. Refill the cooling system with engine coolant.
  8. Adjust the heater valve cable.
  9. Make sure that there is no coolant leakage.
  10. Make sure that there is no air leakage.
  11. Connect the negative battery cable.
  12. Perform the power window control unit resetting procedure.
  13. Enter the anti-theft codes for the audio and the navigation system, and then enter the audio presets.
Rear To Remove:
NOTE: The rear blower motor, the rear heater core, the blower screen, the rear blower resistor (heating/air conditioning system) and the rear power transistor (climate control system), the rear air mix control motor (climate control system) , the rear mode control motor and the rear expansion valve can be replaced without removing the rear heater-A/C unit.
  1. Remove the self-tapping screws and the clamp, and then remove the bolts and the rear evaporator lines with the rear expansion valve. If necessary, remove the rear expansion valve. Use a second wrench to hold the other fitting on the valve so the rear evaporator lines won't twist. Leave the first fitting loosely connected so you can use it to hold the valve while you loosen the second fitting.
  2. Remove the rear heater hoses.
  3. If necessary, remove the rear blower motor, the rear heater core, the blower screen, the rear blower resistor (heating/air conditioning system), the rear power transistor (climate control system), the rear air mix control motor and the rear mode control motor.
  4. Remove the self-tapping screws and the lower housing.
  5. Remove the self-tapping screws, and carefully separate the left upper housing from the right upper housing. Remove the rear heater core.
Rear evaporator assembly honda-10-00-4116.gif

To Install:
  1. Replace the rear heater core.
  2. Attach the heater hoses.
  3. Make sure no air is leaking from the left upper housing and the right upper housing fitting and from the upper housings and the lower housing fitting.
  4. Before reassembly, make sure that the rear air mix control linkage and door move smoothly without binding.
  5. Before reassembly, make sure that the rear mode control linkage and door move smoothly without binding.
  6. Reassemble the housing.
  7. After reassembly, make sure the rear air mix control motor runs smoothly.
  8. After reassembly, make sure the rear mode control motor runs smoothly.
  9. Refill the cooling system and make sure that there is no coolant leakage.
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Oct 16, 2010 | 2005 Honda Pilot

1 Answer

I cannot turn the heat off, regardless of temp seting. If the fan is on hot air comes out. 2001 BMWCI. I suspect it's the heater control valve. Car has climate control.


hi daytona67, I would suspect the heater valve. If I remember correctly, the valve is located on the driver's side below the airbox. Once you find the valve, you can use a pair of hose pliers to clamp off the hoses and see if the heat stops. The valve is most likely internally broken. Since the auto-climate system sends a cut-off signal to water valve, I would suspect a failed valve before a faulty control unit.

Apr 15, 2009 | 2001 BMW 3 Series

2 Answers

1994 C-1500 V8 - no heat


something wrong with clima control ,check the thin plastic pipes have a vacumn in them ??if all else fails wedge the flap open as tis so dammed cold evan here in spain.

Jan 28, 2009 | 1994 Chevrolet C1500

1 Answer

2001 Acura TL Climate Control Blowing only Cold Air.


Ok it may be that the heater core bypass valve isnt opening. All that valve dose is when you turn the climate control to heat it opens a valve that allows hot coolant from the engine to flow through the heater core. What I would do is check that. It will be on the left side (passange) of your engine bay.You will see two black coolant hoses next to eachother and one will have a black box with a wire that runs to it. Have someone move the climate control from hot to cold to hot back to cold. If you dont see the wire move then you can move it yourself to open the valve.

Let me know if the valve opens or not using the climate control.

Dec 15, 2008 | 2001 Acura 3.2TL

2 Answers

Heater won't get hot on 2005 dodge caravan


there could be an air lock in the system, pluged heator core, a bad thermostate or control modual. try bleeding the air out through the bleeder screew if there is no heat after that have the control modual tested if its okay try having the cooling system flushed then if it still doesnt heat intall new termostate

Oct 22, 2008 | 2000 Dodge Caravan

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