Question about 2004 Ford F150

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Why is there no water going to the heater core in my f150?

This is a 2000 ford f150. I'm not getting any water to the heater core

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  • Ford Master
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Sounds like flow control valve or plugged heater core. See if you can test for continuity if the valve is electric or vacuum if it uses vacuum to work. If the valve is electric and you have continuity, then check for power to it when the heat is set.

It may be possible to isolate the heater core and use a water hose to backflush it. One thing that happens on F150 series is the Temperature knob on the dash breaks and fails to turn the heat stem.

The back of the knob has an elaborate set of ridges to position it. The stem is simply a half-moon shaped shaft. Turn the shaft gently with a pair of wrapped tip pliers to see if water flow improves.

Please rate my info.

Posted on Jan 14, 2013

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Could be your water pump is bad and not circulating correctly.

Posted on Jan 14, 2013

  • lpeysen
    lpeysen Jan 14, 2013

    I just replaced the water pump and it's cooling the engine just fine.Any other ideas?

  • Thomas Perkins
    Thomas Perkins Jan 14, 2013

    Trying to find a picture of your heater hose route.You have 2 heater hoses go thru the firewall to the heater core,one hose may have a valve added to it and it may be stuck closed,go check to see.



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SOURCE: Heater core 1990 Ford F-150

I believe this is the easiest heater core ever invented. If it is like the 1986 model. I believe it is. You take out the glove box door. The heater core is right there under a cover in the duct work.

Posted on Oct 13, 2008

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SOURCE: Water Retention

I am sure the pressure test will show the location of the leaks, also no explorer does not have a rear heater core.

Posted on Nov 27, 2008

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SOURCE: I have a very leaky heater core in my 2001 Ford Excursion 4x4 PSD

You could disconnect the hose from the core and connect it to the return for the time being. Of course, you'll have no heat for when the temperature drops back into the 90's. :^ )

Posted on Jun 30, 2009

  • 881 Answers

SOURCE: heater gets just a little warm

The thermostat is on both v8 and straight 6 engines are where the top hose goes to the engine and the thermostat is held on with 2 bolts (and make sure it goes back in the same way as it comes out).
But to wash out the heater core well there are 2 5/8" hoses going into the firewall and can be either 2 togeather or one either side of the engine but they are 5/8" hoses, and 1/2" on the early engines, nearest to radiator and turn heater switch to hot with engine running then turn it off and remove the hoses and put the hose flush with the heater hose and turn it on to flush out ,,refit hoses refill with COOLANT. start and test run..

Posted on Oct 08, 2009

  • 426 Answers


1. drain coolant
2.remove instrument panel
3. for 5.4 (4v) if equiped,remove junction splash shield
4.for 5.4 (4v) if equiped, disconnect starter relay cable9ad8eea.gif

  1. For 5.4L (4V), if quipped, remove junction block bracket.
  2. Clamp inlet and outlet heater hoses.
  3. Disconnect heater hose from heater core by gently pressing it toward heater core.
  4. Remove A/C plenum demister adapter.
  5. Disconnect vacuum line.
  6. Remove 13 plenum chamber top screws.
  7. Remove blend door assembly from case.
  8. Remove heater core.
To Install:
NOTE: If needed, clean and lubricate coolant hoses with plain water.

  1. Install heater core.
  2. Install blend door assembly to case.
  3. Install 13 plenum chamber top screws.
  4. Connect vacuum line.
  5. Install A/C plenum demister adapter.
  6. Connect heater hose to heater core.
  7. Release all clamps from inlet and outlet heater hoses.
  8. For 5.4L (4V), if quipped, install junction block bracket.
  9. For 5.4L (4V), if quipped, connect starter relay cable.
  10. For 5.4L (4V), if quipped, install junction splash shield.
  11. Install instrument panel.
  12. Refill engine coolant.
I hope this helps you

Posted on Nov 12, 2009

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As water leaks into the A/C & Heater core compartment trickles to the overflow drainhose on the firewall. This is usually intended for the condensation of the A/C core but a leaking heater core will drain that way too.

From what I hear, I'd see about disconnecting the heater core hoses going into the firewall and maybe use a splice to connect them to each other OR get a two 5/8 bolts and a couple clamps and plug the hoses.

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How do you remove the heater core from a 1997 ford f-150

Heater Core Removal & Installation To Remove:
NOTE: If a heater core leak is suspected, the heater core must be leak-tested before it is removed from the vehicle.
  1. Remove or disconnect the following:
    • The negative battery terminal
    • Engine coolant
    • The instrument panel Heater Hoses for_f150_conn_tabs_htr_hses.gif

    • The heater water hoses at the heater core
      1. Compress the holding tabs
      Remove the A/C plenum demister adapter for_f150_dmstr_adptr_rem.gif

    • The screw
    • The A/C plenum demister adapter Disconnect the vacuum line. for_f150_vac_line_rem.gif

    • Vacuum line Remove the heater core bracket. for_f150_htr_core_brckt_rem.gif

    • The screws
    • The bracket Remove the plenum assembly top for_f150_plnm_case_top.gif

    • The 13 screws
    • The plenum chamber top Blend door assembly for_f150_blnd_door_assmbly.gif

    • The blend door assembly from the case
    • The heater core
To Install:
NOTE: Lubricate the coolant hoses with MERPOL(R) meeting Ford specification ESE-M99B144-B or plain water only, if needed.
  1. Install or connect the following:
    • The heater core
    • The blend door assembly into the case Blend door assembly for_f150_blnd_door_assmbly.gif

    • The plenum chamber top
    • The 13 screws
    • The bracket
    • The screws
    • Vacuum line
    • The A/C plenum demister adapter
    • The screw
    • The heater water hoses at the heater
    • Engine coolant
    • The negative battery terminal
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Jun 20, 2010 | Cars & Trucks

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