Volvo AWD V70-XC70 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 12/2002 V70-XC70 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

Heater not heating V70-XC70 2005

posted by  kcookvt on  Thu Oct 18 05:57 CST 2018
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Tue Aug 5 19:59 CST 2014
[RELATED]

First cold morning of the year, and our new-to-us '05 XC70 (175,000 miles) is barely putting out any heat. There's a little if I turn the knobs to the highest setting, but not much. Thermostat on the dash seems to be where it should be. Any thoughts?








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Heater not heating V70-XC70 2005

    posted by  rehsper on  Tue Oct 23 07:49 CST 2018
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Apr 27 13:03 CST 2012
    [RELATED]

    Are all the servo motors/flapper doors working?

    With the engine off and key in position II, change the temperature setting from cold to hot, hot to cold and also switch the defrost/panel/floor settings. You should be able to hear the doors opening and closing. It could be that the door that controls the air temperature is broken in the closed position, not allowing air in from over the heater core.

    I recently had this condition in my S40. None of them were working. Turned out to be a blown fuse for the rain sensing wipers (apparently the automatic climate control systems takes signals from all manner of things). So it might be worth checking all your fuses too.

    Good luck,
    Will








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Heater not heating V70-XC70 2005

    posted by  jwalker on  Thu Oct 18 12:49 CST 2018
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Jun 6 08:39 CST 2014
    [RELATED]

    Let me add one more possibility. Clogged heater core. If that happens to be the case (hopefully not!), try flushing it first as replacement will be expensive.








    •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

      Heater not heating V70-XC70 2005

      posted by  KlausC on  Fri Oct 19 09:54 CST 2018
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Fri Oct 24 10:15 CST 2014
      [RELATED]

      Not to refute your answer, but what would clog a heater core?
      --
      Keeping it running is better than buying new








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        Heater not heating V70-XC70 2005

        posted by  jwalker on  Fri Oct 19 14:22 CST 2018
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Jun 6 08:39 CST 2014
        [RELATED]

        Somewhat unusual problem, but it does happen. Just read that clogged heater cores are a common problem with Jeeps.

        Corrosion is the probable cause. If you buy a used car you usually don't know what the previous owner might have put in the cooling system. Using water or stop leak for example. Or no coolant changes which might cause a corrosion buildup.

        https://www.ericthecarguy.com/faq/solving-automotive-hvac-problems/part-2-heating-system/clogged-heater-core







        •   REPLY TO THIS MESSAGE    PRINT   SAVE 

          Heater not heating V70-XC70 2005

          posted by  Chris Mullet on  Sun Oct 21 13:58 CST 2018
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Fri Oct 24 09:08 CST 2014
          [RELATED]

          I had a clogged heater core on my Dakota pickup several years ago. Probably due to not flushing the cooling system. Flushing it in the opposite direction of the normal flow got it working well again. (A bunch of whiteish setiment came out.
          --
          Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)








          •   REPLY TO THIS MESSAGE    PRINT   SAVE 

            Heater not heating V70-XC70 2005

            posted by  jwalker on  Mon Oct 22 18:17 CST 2018
            Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
            last visit: Fri Jun 6 08:39 CST 2014
            [RELATED]

            Same thing with my Passat. Reverse flush is the ticket! Could be worse, at least it hasn’t leaked...:)
            --
            Will I buy another Volvo??? We'll see....








    •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

      Heater not heating V70-XC70 2005

      posted by  kcookvt on  Thu Oct 18 15:20 CST 2018
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Tue Aug 5 19:59 CST 2014
      [RELATED]

      Thanks! Any hints about how to flush a heater core?








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        Heater not heating V70-XC70 2005

        posted by  Chris Mullet on  Thu Oct 18 15:55 CST 2018
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Oct 24 09:08 CST 2014
        [RELATED]

        Disconnect both heater hoses at their quick disconnects on the engine side of the firewall. Run water through the heater core in both directions with a garden hose. Caution - don't connect the garden hose in such a way that it is perfectly water tight as it will subject the heater core to full house pressure which is probably more that the core can handle.

        Reference:

        http://www.v70xc.com/0/resources/how-to/pdf/heat_exchanger_removing.pdf
        --
        Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)








        •   REPLY TO THIS MESSAGE    PRINT   SAVE 

          Heater not heating V70-XC70 2005

          posted by  kcookvt on  Fri Oct 19 06:01 CST 2018
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Tue Aug 5 19:59 CST 2014
          [RELATED]

          Thanks! Is this a DIY?








          •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

            Heater not heating V70-XC70 2005

            posted by  KlausC on  Fri Oct 19 09:54 CST 2018
            Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
            last visit: Fri Oct 24 10:15 CST 2014
            [RELATED]

            https://www.youtube.com/watch?v=37u_oQ0Q0Gc
            --
            Keeping it running is better than buying new








            •   REPLY TO THIS MESSAGE    PRINT   SAVE 

              Heater not heating V70-XC70 2005

              posted by  Chris Mullet on  Mon Oct 22 11:29 CST 2018
              Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
              last visit: Fri Oct 24 09:08 CST 2014
              [RELATED]

              So that explains why I had so much trouble getting that darned brake light switch outa there!

              Also, he doesn't mention it, but if you take a couple pieces of scrap rubber or plastic hose you can blow the majority of the coolant out of the core and into a container. That way when you tilt it downward while sliding it out it won't drop so much coolant out onto the floorboard (or the plastic bag that's covering the floor board).
              --
              Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    Heater not heating V70-XC70 2005

    posted by  KlausC on  Thu Oct 18 12:44 CST 2018
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    Several things: Do you have an IR thermometer that you can point at the top coolant hose?

    The car's thermometer may be broken and stuck open. Engine will never get to hot and take a long time to warm up. Do not relay on the dash gauge.

    If the coolant overflow bottle is empty, not enough coolant in the system to make it to the cabin.

    Depending on which system you have, manual or electronic, you may have a loose/mis routed cable or a broken vent damper.

    Have you ever changed the cabin filter?

    --
    Keeping it running is better than buying new








    •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

      Heater not heating V70-XC70 2005

      posted by  kcookvt on  Thu Oct 18 15:19 CST 2018
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Tue Aug 5 19:59 CST 2014
      [RELATED]

      I have not changed the cabin filter; would that also affect the A/C? AC blows pretty cold. I guess I have some exploring to do.







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.