Nasty noise from 1990 740T Interior Fan (Heater)

Discussion in 'Volvo 740' started by Matthew Pierce, Feb 6, 2004.

  1. There is this whining noise coming from the interior heater fan, when I turn
    on the heater. Its on the passenger side and it sounds like a cat being
    killed slowly. I think I'm gonna have to get behind the glove compartment
    box and take a closer look.

    Any tips as to what this might be or how to handle it?

    Thanks.

    Matt
     
    Matthew Pierce, Feb 6, 2004
    #1
  2. Matthew Pierce

    James Sweet Guest

    If it's the same as the '87, it's the same fan motor as a Chevy Celebrity
    uses, I think they may have updated the heater box design by that year
    though in which case I don't really know. In the older cars you get to the
    fan from underneath the dash, it's covered by the same cover to the right of
    the passenger's feet as the ECU is behind.
     
    James Sweet, Feb 6, 2004
    #2
  3. I just had to replace mine. It is located to the right of your passengers feet.
    You can locate it by sound pretty easily. On my car I had to loosen the plastic
    piece on the floor in the doorway which enabled me to remove the plastic kick
    panel. Remove the computer brain leaving it plugged in and tuck it out of the
    way and remove the housing so you can get your hands in easily. I had to pull
    the carpet and padding way back out of the way and found it much easier than
    leaving things in place. When I was doing my fan replacement I saw online where
    someone mentioned the new fans do not always have the drain holes. Sure enough
    the old fan had the holes and not the new so I added them to match the old fan.
    Just be careful to put the fan in straight and that it is not bound up when you
    tighten the fasteners. I would recommend turning the fan on and making sure it
    sounds right before you button everything back up. It did not take too long if
    you discount the breaks I had to take to get feeling back in my hands from
    trying to fit them in before I removed the bracket and carpet.
    Good luck.
    Chris V
     
    electricsheep, Feb 7, 2004
    #3
  4. Thanks Chris,

    That was helpful. Where did you get the replacement and what does it cost
    and what is it called exactly?

    Thanks again,

    Matt
     
    Matthew Pierce, Feb 8, 2004
    #4
  5. BTW,

    Can't I just WD40 the motor?



     
    Matthew Pierce, Feb 8, 2004
    #5
  6. Matthew Pierce

    Mike F Guest

    WD40 is not a long term lubricant. If you could get a drop of oil on
    the bearings, that may help, or it may only extend the life of the motor
    a couple of days. However, it's hard to get that drop of oil where it
    will do any good, especially on the fan end. To much oil will foul the
    brushes.

    --
    Mike F.
    Thornhill (near Toronto), Ont.

    NOTE: new address!!
    Replace tt with t (twice!) and remove parentheses to email me directly.
    (But I check the newsgroup more often than this email address.)
     
    Mike F, Feb 9, 2004
    #6
  7. Matthew Pierce

    James Sweet Guest

    Also the motor is pretty cheap, I got mine for under $20 brand new, not
    worth mucking around with the old one.
     
    James Sweet, Feb 9, 2004
    #7
  8. Matthew Pierce

    camshaft Guest

    Hi Matt: Water comes in through the air vent/cowl and sometimes gets
    trapped at the base of the motor, which eventually rusts the motor shafts
    and causes the howling, or ruins the motor. There is a rubber heater tube
    that is designed to dry the motor, but this doesn't always work. I
    documented the procedure on a 1985 740 I owned, along with some possible
    aftermarket sources.

    http://cvolvo.com/Central/Repair/740.html

    Good luck... Cam

    --
    Cameron Price Newington, Ontario, Canada
    http://cvolvo.com
    1953 PV444 "E" #54940
    1953 PV444 "E" #61576
    1960 P 120 Amazon #046279 104,700 miles
    1980 262C #6618 244,400 km
    2001 V70 AWD XC 62,172 km
    F2000SL 4,240.2 km Cannondale Volvo Team Replica
    R600 2,882.5 km Cannondale road bike
    Jekyll 3000 4,653.0 km Cannondale Volvo Team Replica

    TACX i-Magic Indoor Virtual Trainer 902.33 km
     
    camshaft, Feb 12, 2004
    #8
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