No cabin filter=A/C problem? Known by Volvo?


               No cabin filter=A/C problem? Known by Volvo?

  posted by  someone claiming to be P.Dwyer on Wed Dec 19 13:01 EAST 2001

 Just following this long, sad thread about the 850 A/C evap brouhaha; lots of right AND wrong, as is the
 case in many situations, automotive and otherwise. Having helped my mechanic do a few of them, I have
 seen, and heard from him, most of what the problems are. For one thing, the 740 A/C evaps are a snap to
 replace, not $1,000 (US). The cab forward'/transverse engine design severely limits accessibility, which
 necessitates removing the console, dashboard, steering wheel, etc. That means time, which means money.
 Also, from what I have seen, the replacement evaps 'appear' to be made by the same company as the
 original (bad) ones. Also, the lack of a cabin air filter in the first years of 850 production exacerbated the
 problem. At some point, the wily Swedes began not only installing cabin air/pollen filters in the later
 models, they ALSO (key point, methinks) began to make available a retrofit kit, including an adaptor, for
 the earlier models. To my way of thinking, this points to KNOWLEDGE on the part of VoVo that they
 KNEW there was a problem. WITHOUT the filter, leaf particles, dust, any other number of things that
 can drop into that confined, nearly-inaccessible space which leads to decreased efficiency on the part of
 the evap unit. In an industrial setting, with access to be able to spray 10K psi water over the fins WILL
 contribute to a unit's efficiency, implying that it adds to its longevity as well; it's just not a one-for-one
 comparison to THIS shituation. My indie mech says that the tannins and other acids that leach out of the
 debris that sits up against the evap actually corrodes the metal, eventually leading to most of the causes of
 them eventually leaking. (I don't know enough to say that he is right, but inevitably, upon seeing the
 removed unit, there is always a big wad of leaf/plant material detritus sitting on the fins, and apparent
 corrosion---I do NOT know if there are actually any holes in the metal.) All in all, it sounds like the
 bottom line is that VoVo MAY have rushed an unproven or poorly-tested 134-capable unit into
 production (through the manufacturing sub-contractor/supplier), but if the units hold up for 'X' miles/years,
 they have fulfilled their warranty. Perhaps not morally, but probably legally. That is life in the big city. The
 bottom line seems to be the sage who suggested voting with your feet, or with your checkbook, or
 however you want to put it: go to someone else. Personally, I have a very unglamorous older (it gets
 worse) diesel 740, and am happy as a pig in s**t. My 850 friends in Atlanta have so many sad songs to
 sing about their 850 that they,,,yes, bought a Japanese car and are v-e-r-y happy. If ya can't take the
 heat, get outta the kitchen. Sad, tough, not nice, but true. Ford will have a lot of catching up to do. But
 they know that there are a lotta fish in the sea, so prolly as many people who drop OUT of VoVodom
 will be replaced by starry-eyed newbies...and the beat goes on. Sorry to take up so much space. It's just
 food for thought.--PD.



Re: No cabin filter=A/C problem? Known by Volvo? 850 94
       posted by  someone claiming to be Wayne on Thu Dec 20 05:35 EAST 2001
      I have also heard the theory that R134a is more corrosive than R12, which led to leaks from inside the
      evap. Depends on which theory you believe. I am sure Volvo's response as to why the filters were added
      later would simply be that they wanted to provide their customers with a pollen-free environment. I added
      the filter to mine a couple of years ago and still have the original evap after 8 years. I recharged the system
      a few years ago and it still works fine.


It gets worse
       posted by  someone claiming to be Captain Ron, formerly Ron on Thu Dec 20 04:25 EAST 2001
      Actually, the evaps on 200/700/940s rarely failed (excluding 960s) but I'd hardly call replacing them a
      snap in comparison as the job's similar (and costly), remove dash and heater box assembly to replace
      evap on 700s. The newer 960s are cake however. My old 700 still has its original evap, ONLY part of
      AC system never replaced in 210K miles.

      As for newer cars, they're problems became far worse after '98 on up with items other than just AC,
      some costlier like AWD problems and thus Volvo's since lost many a former owner to their competition.

      Ford's doing NOTHING to solve Volvos new car problems and I doubt they will until we see the Ford
      platform cars in a couple more years. All they're doing so far is just dumping more money into Volvo.


Re: No cabin filter=A/C problem? Known by Volvo?
       posted by  someone claiming to be jon on Thu Dec 20 03:31 EAST 2001
      10 kpsi water blast increases evaporator efficiency by it usually damages the fins and any coating that they
      have, but this example shows that you can expect long life from a simple piece of equipment if it's built
      right. And built right dosn't mean heavy duty steel. The tubes have 0.02" wall and the fins are 0.01" thick
      and both are made of copper. What counts is corrosion protection and its application. If Volvo cannot
      cope with few rotten leaves then they should ask where Hondas, Toyotas, etc. get their evaporators from
      and what corrosion protection coating they use. Heck, they don't even have to go overseas to get a good
      heat exchanger, just a next door office would do. The same refrigerant flows in the condenser that's
      located in front of the radiator exposed all the time to water, stones, salty sprays, bugs, leaves and I
      haven't heard all that much about condenser failure. I guess Volvo should've sourced evaporators from the
      condenser supplier.

 


Re: No cabin filter=A/C problem? Known by Volvo?
            posted by  someone claiming to be Brent on Thu Dec 20 12:28 EAST 2001
           Those evaporators are made by ford,same ones used in the taurus.I don't think it's got any thing to do
           with not having the pollen filter or 134a they're just bad parts! I've changed lots of them.Good luck!

 



 
 

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