Air from Fresh Air Vents Too Hot

Discussion in 'General Motoring' started by KathyK1296, Sep 30, 2003.

  1. KathyK1296

    KathyK1296 Guest

    I have a 1994 Honda Accord Lx Wagon. The air that comes in the fresh air vents
    into the interior has gotten progressively warmer. It feels like the heat is
    on, even when the air outside the car is very cool. I suspect there must be a
    leak somewhere where the heat off the engine is coming in? I have looked but
    cannot find how the air is piped into the interior of the car. Can someone
    please tell me where to look? Any other input is greatly appreciated also.
    KathyK1296, Sep 30, 2003
  2. KathyK1296

    Jafir Elkurd Guest

    Do you have the temp control set to hot? Sometimes the knob breaks and
    won't actually do anything when you turn it. The hot water valve could also
    be out of adjustment.
    Jafir Elkurd, Oct 1, 2003
  3. -----------


    Hot water gets pumped from the engine, thru the heater 'core', and back
    into the engine. The sliding control on your dash pushes a cable which
    opens and closes a 'water tap' under the hood (as well as a couple of
    doors that divert air). Have someone look under the hood and see that
    the tap is not closing as tight as it should. Our Odyssey is like that,
    and so the effective length of the cable must be lengthened by
    unscrewing it at the point where it is anchored and sliding it along a
    bit. I've thought of mounting a spring to the 'tap' to help it shut

    'Curly Q. Links', Oct 1, 2003
  4. KathyK1296

    Guest Guest

    I owned a 1994 Accord EX sedan for nine years, 145,000 miles. When I
    first got it, the heat never got very hot compared to other cars. Years
    after thinking the heat was poor, I found the heater control knob locked
    up one day. I spent more than $100 to fix it at the dealer and then,
    suddenly, I had very hot heat! On the other hand, I noticed that the
    heat never quite fully shut off. I complained at the dealer and they
    seemed to hint I was nuts until I proved it to them. They said they did
    something but the problem continued -- the heat was slightly on even
    when the temperature control knob was fully to the cold position.

    A couple of years ago I came across a TSB (technical service bulletin)
    aka Honda Service Bulletin 93-037 (Issue Date Nov. 14, 1994)
    "Unsatisfactory Air Conditioner Performance". It seems the heater
    control cable can be out of adjustment and/or the air mix cable is
    binding and/or the temperature control knob gears are out or
    synchronization. The air mix control cable may need replacement.

    The problem seemed to slowly get worse over the years and got bad enough
    that the air conditioner was ineffective when it got even slightly hot.
    I went to a dealer who estimated around $120 to fix it.

    While on the phone with Honda for a recall about something else, I
    complained about this problem and was told by a rep. from California
    that Honda would not help pay to fix it as the car was too old for them
    to support. ( But the recall was support wasn't it?) I got rid of the
    car without fixing it. I was not convinced that it would stay fixed.

    In my opinion, the 1994 Accord's heater and air conditioner systems are
    trouble prone. Consumer Reports data seems to support this for the air
    conditioner. (The air conditioner condenser was replaced after a recall
    by Honda.) The air conditioner may have been the first year of CFC free
    design and is not as powerful as it could be. I suspect that the heater
    control may either rob you of full heat on or full heat off.

    If you want it "fixed", you can bring your car to a Honda dealer. They
    should know the problem and be more than happy to charge you to take
    apart your dashboard and perform the repairs as listed in the service

    If you want to do it yourself, you might need the TSB from (But you will have to buy a bound volume of 1994 Honda
    TSB's just to get the several pages you want.)

    Good Luck.
    Guest, Oct 1, 2003
  5. KathyK1296

    Al Reynolds Guest

    Hi Kathy,

    I have a 97 Wagon (94-97 model) and I'm willing to bet the
    problem on yours is identical to the one I had on mine. When
    you turn the heater dial down, does it "click" into place at the
    bottom of the dial? If it doesn't, then you just need your heater
    control cable adjusting. Unfortunately this requires the dash
    to come off as can only be adjusted at the "dial end".

    I have a temporary fix at the moment, but mine is a UK
    wagon so some of the following may be the wrong way round
    for your US wagon due to left-hand drive:

    In my passenger footwell, to the left of the central console
    and under the dashboard, there is a black vent. It is the one
    which blows down onto your feet when you have the heater
    on the "feet" setting, so if you can't find it just turn the heater
    fan on full and feel for where the air is coming from. This vent
    is only held in place by one plastic "pop-rivet" which you can
    pry out (you're supposed to use a special Honda tool!).

    Once you have removed the vent, you should be able to see
    the other end of the heater control cable assembly. It is
    directly behind where the vent was. You won't immediately
    know which bit it is, so get down there with a torch and use
    your other hand to twiddle the heater dial. You should see
    a mostly circular metal part with a pin sticking down moving
    around - the end of the heater control cable should be attached
    to the pin.

    To get cool air again, I had to look and see which way the
    pin moved when I turned the dial towards cold, and once I had
    pushed the dial as far as it could go, I then had to push the pin
    in the same direction. One satisfying "click" later, and the hot
    air stopped. I haven't bothered replacing the vent.

    Hope this helps - let us know how you get on,
    Al Reynolds
    Al Reynolds, Oct 1, 2003
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