2005 EB No Rear Heat No Clicking

Discussion in 'Heating & Cooling' started by The Four, Dec 13, 2017.


  1. The Four

    The Four Member

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    Good Afternoon!

    I have a 2005 EB with 139,000 miles on it. The rear heat in my vehicle is not blowing through the vents. Heat is coming out through the dashboard vents however. I recently refilled the coolant to proper levels and the problem persists. I do not have the characteristic rear passenger side actuator clunking sound, as my rear heater door blend actuator used to do this and was replaced in 2015 at 109,000 miles. The air conditioning in the rear does work properly. I believe this problem was fixed after the rear heater door blend actuator was replaced, but it is difficult to pinpoint when the problem returned, as I live in Texas and do not have to operate my rear heat very often.

    Let me know if you need any more information, thank you for your time and help.
     
  2. Bedrck47

    Bedrck47 Full Access Members

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    Check fuse #18 with a volt meter to make sure it has voltage in and out of the fuse.
    Also check the blend door actuator to make sure it is changing position
    Check the heater hoses going to and from the rear heater core to see if they are hot or cold
     
  3. The Four

    The Four Member

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    Thanks, I’ll check those when I get some time this weekend, and I’ll let you know what happens.
     
  4. The Four

    The Four Member

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    Fuse 18 does have voltage. I got a reading of .9 volts.
    The hoses going to and from the heater core are hot.
    And the rear door blend actuator doesn’t appear to do anything when the temperature is switched from hot to cold. Are you supposed to hear anything when sitting right next to the actuator?
     
  5. Bedrck47

    Bedrck47 Full Access Members

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    Recheck voltage for fuse #18
    Make sure the key is in the run position Check both sides of the fuse You should have 12 Volts on both sides if only on one side replace the fuse 10 Amp fuse
     
  6. The Four

    The Four Member

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    When you say check both sides of the fuse, do you mean place a probe on each side of the fuse when it’s plugged in, or something else? I’m relatively new to diagnosing electrical issues in a car.
    Thanks
     
  7. stamp11127

    stamp11127 Super Moderator Staff Member

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    See Fuse testing 101 in the electrical section.
     
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  8. Bedrck47

    Bedrck47 Full Access Members

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    Look at the attached pic See the metal tabs on each side of the "10" You can test those tabs for voltage One lead to the tab and one lead to ground Test each side and you should get 12 Volts No need to pull the fuse

    Also as Stamp suggests

    Car_fuses.jpg
     
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  9. Vancouver Bob

    Vancouver Bob Full Access Members

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    Wow! I just learned something new! Thanks for sharing!
     
  10. Vancouver Bob

    Vancouver Bob Full Access Members

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    Do you get any air blowing from the rear unit at all? The actuator doors adjust temp and directs air flow to ceiling or floor. If you're not getting any air the blower isn't working so either a fuse or the blower (or perhaps the connector to the blower if someone was working back there recently).
     

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