Question about 2004 Ford F150

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1997 F150 heater problem

Already replaced the thermostat, clucth fan and heater motor. Still no heat. Lines to heater core get hot. When you move the heater control the temp doesn't change. A/C side works perfect.

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  • Ford Master
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Your problem is caused by the air temperature control blend door actuator motor being defective, the little motor moves the door that gives either hot air or cold air or a blend of the 2.

Posted on Feb 21, 2009

  • toyiab1
    toyiab1 Jan 13, 2014

    i was told that that was the problem as well.. so i had that disconnected too..cuz it seem like it was stuck on air condition?

  • yadayada
    yadayada Jan 13, 2014

    That is the problem for sure, the door is jammed and the motor that moves it is damaged due the door issue. The dash must come out in most cases, check the repair manual at this site www.alldatadiy.com. It is a pay for use site.

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2 Answers

Why wont my heat in my1997 ford f150 work


check coolant level and temperature of the heater hoses after the engine is at operating temp. the heater hoses should be the same temperature if not then the heater core is plugged and needs replacing. if the hoses feel the same temperature but not heat you may need to replace the thermostat. I am guessing the blower motor is functioning to blow air over the heater and into the cab.

Jan 13, 2015 | 1997 Ford F150 Regular Cab

1 Answer

No heat replaced heater core thermostat


So the blend door opens? Does the fan motor blow? Are both heater hoses hot? That would indicate the coolant is circulating through the core.

Dec 12, 2013 | Ford Windstar Cars & Trucks

1 Answer

I have no heat I have a new thermostat and the heater core dosent leak.


When you say you have no heat is this referring to nothing when control is turned on? Does fan work? or you have no hot air at all.
If no fan could be a blown fuse [blower motor] thermostat could be installed incorrectly or faulty. Could be a faulty heater control valve if you have one not allowing hot water into heater core.

Jan 26, 2013 | 1987 Chevrolet Cavalier 4 Door

2 Answers

No heat ,


Check the vacuum lines to make sure they are correctly connected and in good shape. If they are not, then the system wont move the dampers to allow hot air into the heat vents. A second possibility is a clogged heater core, which is not allowing hot water to circulate through it. As you say the head has been replaced, I would have someone insure every thing was reconnected correctly. It could be the hoses to the heater core are reversed!

Jan 18, 2013 | 2000 Ford Taurus

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Very little heat from heater.. have replaced the thermostat, heater hoses are both hot, and the blender door is working fine ( drilled a hole in the heater box and stuck a camera in )


try running water thru the heater core. In one hose and out the other. Probably clogged. Also make sure value in the heater hose is operating.

Sep 20, 2011 | 1997 Ford F150 Regular Cab

1 Answer

Heater fan blows good but only blows cold air. Is it the heater core? The thermostat? How hard are they to replace if i do it myself?


Check the heater core by checking the hotness or coldness of the 2 tubes at the firewall that lead to the heater core.

If both tubes are hot, the heater core is fine. If both tubes are cold, then the heater core is plugged up and will have to be flushed out or replaced.

The thermostat, if stuck open, will delay the heating up of the heater core. It's not hard to replace the thermostat.

Thermostat Removal & Installation 4.2L Engine To Remove:
  1. Before servicing the vehicle refer to the precautions at the beginning of this section.
  2. Remove or disconnect the following:
    • Some of the coolant
    • The upper radiator hose f150_42_thermostat.gif

    • The bolts (A).
    • The water outlet connection (B)
    • The water thermostat and paper gasket assembly (C)
To Install:
NOTE: The water thermostat is indexed and must be installed correctly.
  1. Install or connect the following:
    • The water thermostat
    • The thermostat
    • The water outlet adapter
    • The bolts
      1. Torque to: 80 inch-lbs (9 Nm)
    • The upper radiator hose
    • The coolant
4.6L/5.4L Engines To Remove:
  1. Before servicing the vehicle refer to the precautions at the beginning of this section.
  2. Remove or disconnect the following:
    • Some of the coolant
    • The upper radiator hose f150_46-54_thermostat.gif

    • The bolts (A)
    • The water outlet connection (B)
    • The water thermostat
    • The O-ring (discard)
To Install:
  1. Install or connect the following:
    • A new O-ring to position the water thermostat in the upper intake manifold
    • The water outlet connection onto the upper intake manifold
    • The bolts
      1. Torque to: 18 ft-lbs (25 Nm)
    • The upper radiator hose
    • The coolant
prev.gif next.gif

Jan 28, 2011 | 1997 Ford F150 Regular Cab

1 Answer

I have a 1998 ford f-150 and no heat. i have replaced the heater core, blend door and control switch. checked the blend door motor- works fine. have tryed 3 thermostats. when i replaced the core i back...


You just might have an air lock. Try bleeding the system from the heater hose at the firewall. Losen one hose a little, and at operating temp. open slightly to let air out. You will lose some coolant, but just refill the rad. Now, both hoses should get hot.

Jan 01, 2010 | 1999 Ford F150 Regular Cab

1 Answer

NO HEAT AT ALL FROM THE VEHICLE ONLY COLD AIR


if the heater hoses going in and out of the heater core are hot, then your temp blend door is not moving to allow heat from the heater core into the car. either the temp knob or blend door motor is bad. some are vacuum, some are electric.

Feb 22, 2009 | 1997 Ford Explorer AWD

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