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heater core? S90-V90

posted by  96_964 on  Sun Dec 23 07:01 CST 2007
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last visit: Fri Jun 11 01:39 CST 2010
[RELATED]

OK, I have read thru piles of posts on the subject. I hope it is not the heater core but I am afraid that is the case. A leak showing up on the passenger floor, fogged windscreen, occasional mist from the vents. No leak on drivers floor and it looks like the core is on that side of the tunnel? If the core is on the passenger side of the tunnel where is the leak on the passenger side coming from?
If it is the heater core I might try to run some seal in there(just into the core, not thru the entire system) just to see if I can get at least a short term repair to get the beast thru the winter. Any comments/suggestions are appreciated. And if someone has the heater/ac pages they can mail me that would be great. Where can I get the OEM manual for the system?

Thanks in advance!








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    heater core? S90-V90

    posted by  96_964 on  Fri Dec 28 10:42 CST 2007
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    last visit: Fri Jun 11 01:39 CST 2010
    [RELATED]

    The heater valve is dead I think. No matter how I set the air or heat the arm does not move. Which way should the arm move for AC on?
    Dave, got the write up. Looks great, but what a job! I wonder if I should use the plasma torch on the fire wall side-that would get at the heater core in about 2 minutes. : )








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      phentermine S90-V90 1951

      posted by  someone claiming to be phentermine on  Mon Dec 31 06:02 CST 2007 [RELATED]

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      heater core? S90-V90

      uid 11021's pic
      posted by  dewfpo on  Fri Dec 28 12:53 CST 2007
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Thu Oct 23 18:34 CST 2014
      [RELATED]

      With temp on cold, there should be vacuum to the valve. It is normally open (no vacuum).

      DEWFPO
      --
      1998 S90 077,400 and 1995 964 154,100








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        heater core? S90-V90

        posted by  96_964 on  Sat Dec 29 03:24 CST 2007
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Jun 11 01:39 CST 2010
        [RELATED]

        Using the highly accurate 'finger over the hose' method it seems weak, but is under vac when set to cold. It does not hiss or seem strong enough to actuate the arm. The arm does not move in any configuration.
        Also, the AC is cycling often. Everything is crashing at once!
        Any additional comments are appreciated.








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          heater core? S90-V90

          uid 11021's pic
          posted by  dewfpo on  Sat Dec 29 05:50 CST 2007
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Thu Oct 23 18:34 CST 2014
          [RELATED]

          It usually doesn't take much vacuum to actuate the diaphragm and close the heater valve. These cars have a well know history of vacuum leaks both in the engine compartment and the HVAC system, so it is unlikely that your heater control valve is bad. But that can easily be checked by connecting an engine vacuum line with plenty of vacuum to the valve temporarily and see it it actuates. If you have a leak in the HVAC system which it probably is, we can give you some hints where to look.

          What ambient temperatures are you running the A/C in? The reason I ask is because it was -8F here last night. A/C cycling is a function of temperature and state of charge. Adding R134a is relatively simple nowadays and cheap. You can buy a can of R134a and a gauge for ~$20 USD at most all Wal-marts.

          DEWFPO

          --
          1998 S90 077,400 and 1995 964 154,100








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            heater core? S90-V90

            posted by  96_964 on  Sat Dec 29 12:26 CST 2007
            Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
            last visit: Fri Jun 11 01:39 CST 2010
            [RELATED]

            Last few days here in coastal Georgia are in the low 70s and wet/humid. I saw those 134 kits but thought I would have to evacuate and recharge from scratch?








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              heater core? S90-V90

              uid 11021's pic
              posted by  dewfpo on  Sat Dec 29 13:59 CST 2007
              Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
              last visit: Thu Oct 23 18:34 CST 2014
              [RELATED]

              The correct way to charge the HVAC system is to put dye in, check for leaks, repair if necessary, vacuum test the system, if it passes, add the correct amount of R134a and oil. But, if your just a little low, all you need is one can of R134a, a pressure gauge and a thermometer.

              DEWFPO
              --
              1998 S90 077,400 and 1995 964 154,100








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                health insurance S90-V90 1951

                posted by  someone claiming to be health insurance on  Mon Dec 31 11:12 CST 2007 [RELATED]

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    heater core? S90-V90

    posted by  Dave Stevens on  Wed Dec 26 14:12 CST 2007
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    last visit: Sun Jan 1 02:36 CST 2012
    [RELATED]

    As others have mentioned, you may or may not have a heater core problem.

    I tried to fire you off an advance copy of the revised heater core diagnosis and replacement procedure article that is destined for the 700-900 FAQ. Unfortunately the e-mail address in your profile bounces probably because it is out of date.

    The original FAQ article was more 700 oriented. The newer one is much improved and includes first hand experience with a 940 system. The revised article should be more appropriate for 960/S90/V90 systems. The Volvo green manual for your model and year would of course provide even more specific details.

    Please reply to me using my e-mail tag above if you want an advance copy of the new FAQ article.
    --
    Dave -940's, prev 740/240/140/120 Never overestimate what little I know.








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      heater core? S90-V90

      posted by  someone claiming to be Steve on  Sun Dec 30 07:05 CST 2007 [RELATED]

      Dave, if I don't yet have this kindly send it when you are ready. I've got some articles yet to be inserted into the new FAQ coming out in a month or so.








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    heater core? S90-V90

    posted by  hans747 on  Mon Dec 24 09:17 CST 2007
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    last visit: Mon Feb 7 07:55 CST 2011
    [RELATED]

    sounds like you have all the symptoms. But make sure of one thing before you tear everything apart: make sure it's radiator fluid that's leaking into your cabin. IF it's just water, then the drain line to your Evaporator is probably plugged up with dirt/leaves/squirrel parts, etc. I know that you might think it's weird to have AC condensation leaking into the cabin at this time of year, but keep in mind that the AC is running every time you use the defroster.

    Anyway, that's my slice of hapless optimism for you on this Christmas Eve. Maybe it's not too late to ask Santa to leave a heater core and accompanying mechanic under the old Christmas tree!








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    heater core? S90-V90

    uid 40935's pic
    posted by  Goatman on  Sun Dec 23 07:10 CST 2007
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Sat Jul 26 20:30 CST 2014
    [RELATED]

    I had a failing core in my v70 series recently. My suggestion to you is not to procrastinate, do not try to use a sealer, do not even try to use the heater until you can replace the core. Mine fogged up the windows and I just could not get them clear, aside from being dangerous, I had migraine headaches. Since I replaced it, I have had none. I procrastinated for almost two years, and two almost accidents.

    Don't try to avoid the inevitable 9, bite the bullet and fix the car. That is just my opinion.


    Try to have a merry Christmas Though!!!

    ps the factory website for the service literature is http://www.volvotechinfo.com







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