[s-cars] Heats too hot.....no too cold

Tue Mar 23 22:49:18 EST 2004

Mike,

I confused the central flap motor and the temperature flap motor. You
have an easy access to the last one as described in the posts from other
listers. First remove the servo and check if the linkage moves without
the motor. Before rebuilding the motor, you want to be sure the linkage
or flap is not jammed. If the linkage moves with the motor removed, it's
time to rebuild the motor.

- Find a 5 or 6V DC power supply (any adaptor with 5 or 6V will do - do
not use 12V on these motor, they are rated for 7.2V or so and will burn
with 12V), a sandy eraser like the pink one at the end of pencil, a
cutter, some white grease and a dremel.
- First, remove the cover of the motor assembly: a few screws and 4
snaps if I remember well. Remove the cover slowly over a clean area as
one of the internal gears has its pivot on the cover. The gears are
greased and will catch any particles it will fall on, and you don't want
that.
- Then, disconnect and remove the electrical motor.
- Remove the brushes and springs on the motor. Once again, work over a
clean area as the springs have a strong tendency to fly around.
- Clean the contact surface of the brush with the eraser. The surface
should be a shiny orange gold once cleaned.
- Cut the pink eraser in the same shape as a brush but longer. Insert
the eraser where the brush usually goes. Make sure the eraser slide
easily in the brush holder. You want to be able to remove it at the end!
- Place the axle of the motor in the dremel and turn the rotor at the
lowest speed while gently pressing on the eraser. A few seconds should
be enough to clean the commutator. Do not "clean" too much as the
commutator have a very thin layer of metal.
- Blow on the commutator to remove eraser particles.
- Reinstall brushes and springs
- Put a very little drop of white grease on each bushing and remove the
excess with a paper towel or any other absorbing material. You'd better
not to use the white grease on the plastic gears in the motor assembly.
Some plastic gear materials require special silicone grease. I don't
know for the gear used in the HVAC motors but you'd better not take a
chance.
- Apply 5-6v on the motor to make sure it works flawlessly with only
small sparks. If the sparks are bigger than 1-2 mm, check the commutator
and brushes for trapped particles. If the motor miss, check for
particles in the motor cage.
- Reinstall the motor in the assembly, reinstall the cover with the gear
and that's it.

I have rebuilt the first HVAC motor more than 18 mo. ago and it's still
working perfectly.

Vincent.

-----Message d'origine-----
De : Mike Platt [mailto:mplatt911 at yahoo.com] 
Envoyé : 23 mars 2004 21:42
À : Vincent_Frigeac
Cc : Scar; Ray Tomlinson
Objet : Re: RE : [s-cars] Heats too hot.....no too cold

I got the code 8.5 and looks like 8.3 too. None of the
linkage moves when I cycle temp control. That write up
would be great. Jerry Scott sent me one on the linkage
problems. I'd like to go in once and check both out.
Thanks
Thanks
Mike
--- Vincent_Frégeac <vfregeac at sympatico.ca> wrote:
> I would suspect the temperature flap rather than the
> controller. Check
> if Channel 01 gives you a code which looks like
> 08.5. If it's the case,
> it's either the servo-motor (big trouble to get
> there) or the linkage,
> accessible from one side of the heater box, from the
> inside of the car,
> but I don't remember which side.
> 
> So, first step, pull the codes on Channel 1 and try
> to guess if there is
> a 08.5 or a 08.something in the code sequence.
> 
> The Air Flow Flap shouldn't affect the temperature.
> Its only effect is
> to lower the air flow when you're driving at high
> speed. You can fix it
> easily as the servo motor is on the driver side of
> the heater box, under
> the wipers tray, the black box above the rubber
> boot. If you want to
> take care of the Air Flow Flap, let me know, I will
> find the post where
> I described how to rebuild these servo motor.
> 
> 
> 
> 
> Vincent.
> 
> -----Message d'origine-----
> De : s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] De la part
> de Mike Platt
> Envoyé : 23 mars 2004 08:08
> À : Scar
> Objet : [s-cars] Heats too hot.....no too cold
> 
> My climate control is now being controlled by my
> power
> windows. The heat can not be run on Auto as it is
> always super hot. I turn it down to 63 and fan speed
> down once car warms up inside. Still lots of hot air
> comes out. If I drop temp display down to "LO" then
> it
> will blow cold outside air. So to regulate heat in
> car
> I alternate between LO and 63 degrees and/or crack a
> window to cool off inside of car.
> 
> Since my display has a couple digits missing, I
> cannot
> pull the codes. Last time codes were pulled, via Bob
> R.(engineer extraordinaire) I had a fault code 01274
> -
> Air Flow flap positioning motor (V71)41-00 - blocked
> or no voltage. Heat seemed to be working fine then.
> 
> Any clues before I think I need to spend the long
> dollar on a used controller?
> 
> Thanks
> 
> =====
> Mike P 
> 95.5 S6 avant 
> 75 911 Carrera targa 
> 74 914 2.0
> 99 Ducati ST4
> 
> 
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