Question about 1998 Mercury Mountaineer

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The control switch when turned to cold remains very hot.

When ran is on only hot air comes out, even in the medium or cold position.

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  • mdemo1951 Apr 24, 2009

    Do you have to remove the entire dashboard? How much should this cost?

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  • 235 Answers

Sounds like you need a new blend door motor. this motor is in the heater box and controls the blend door that lets eather cold or hot air inn or a combonation of both

Posted on Apr 20, 2009

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1 Answer

My Nissan Almera 2005 Model keeps blowing heat even when the switch is off. now when l turn on the aircon hot air is mixing with cold air. Could it be the blower resister?


Could be the diverter paddle control that moves to allow cold air or hot air into the duct. It may be staying in the heat position even when you set the control to cool.

Jan 02, 2015 | Nissan Cars & Trucks

1 Answer

My heater switch seems to be stuck on hot air all the time. Replaced switch but same problem.


under the alternator there is a control valve located in line from the water pump to the heater core, your control switch operates this valve via air. have someone or you can do it yourself turn switch to hot,LOL already there,ok locate this valve and notice the position of the rod on valve. now turn control switch to cold position, recheck position of rod again, did it move? pull air line off valve,or follow air line up a little bit and you will find a coupler, you can disconnect it here. while engine is running put finger over hose and check for suction in cold and hot position. Should only **** in hot position. if ok your inline valve is bad. cheap fix

Jan 04, 2011 | 1998 Ford Explorer

1 Answer

The heater control knob will not turn all the way to either hot (right) or cold (left) so therefore I only get medium warm or medium cold. I assume the knob moves a cable but I cannot see it or remove the...


Cable is probably kinked or slipped adjustment. There are 2 cables connected to the knob. One move the blend door in the heater box to make the air flow thru the heater core, and the other cable opens a valve in the heater hose (engine compartment) to let the hot engine water into the heater core. Check both cables for kinks and fix and kinks. It is still doesn't work, first disconnect both cables at the blend door and valve and check the door and the valve for proper operation (can you open and close them by hand?--if not, these must be repaired or replaced), then, if good, adjust the cables according to this procedure from autozone.com:


CONTROL CABLE Adjustment

  1. Under the hood, open the clamp and disconnect the heater control valve cable from the arm.
  2. Under the dash, detach the air mix control cable from the clamp. Pull the cable from the control arm.
  3. Position the temperature control at MAX COOL.
  4. Turn the air mix control arm counterclockwise until it stops.
  5. Attach the air mix control cable to the arm.
  6. Snap the air mix cable hook into the cable clamp.
  7. Under the hood, turn the control valve to the fully closed position.
  8. Install the heater valve cable to the arm.
  9. Gently pull on the cable housing to remove any slack.
  10. Insert the cable into the clamp.

Oct 20, 2010 | 1996 Honda Accord

1 Answer

No heat air is blowing cold


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

Oct 22, 2009 | 1998 Ford Taurus

1 Answer

MY 1998 FOR TARUS HEATER WILL NOT WORK.WAS DRIVING


It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

Oct 17, 2009 | 1998 Ford Taurus

1 Answer

Heater not working


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

Oct 17, 2009 | 1998 Ford Taurus

1 Answer

98 xplorer cold a/c but when you start moving you feel it start changing to hot air


I had the same problem with my 98 ranger. the problem is the hot cold air blender door. on my truck the the top of the door where the electric actuater is placed broke and no matter what you selected on the controlls you would get hot air. to verify that it is not the A/C place it in the Max A?C position. this will cut off hot coolant to the heater core and you should after a few minutes get cold air. if that works you can find the actuator locaed behond the glove box door on top of theplastic duct next to the blower motor. the only way to fix the problem would be to replace the unit or do what I did I glued the actuater spindle to the blender door. make sure the actuater is in the same position as the door or it wont work.

May 28, 2009 | 1998 Ford Explorer

1 Answer

Dual automatic air temperature control has one side blowing cold


What have done at the dealer before and works you should have bills should be an explanation.

May 11, 2017 | Lincoln LS Cars & Trucks

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