Inge,
I suggest that prior to your next car repair, that you consult Car Talk on NPR. At minimum you'll get a few laughs and may actually get your car fixed.
Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Monday, July 13, 2009 2:39 PM
To: [log in to unmask]
Subject: Re: [TN] NTC (It's not Friday, but this is so true!)
& Law of Car AC System Repair
You will automatically start trouble shooting in the wrong end, and will not
find the failure until when at least 50% of the car is disassambled.
I can prove that, will send pictures to Steve, IF he still can or want
serve us. My AC works intermittently. After one year of annoying I decided
to fix it. Listened with my Volvo man. Typical cost 1,000 dollars and up to
(won't miscredit Volvo by telling what the bill can be), so I went home and
said to myself, you are a highly specialized technician, will be a peace of
a cake to fix that yourself. The start was not the best: Volvo do not give
you the electrical diagram with your customers manual any more. OK, an AC is
a simple refrigerator, compressor, condensor, reservoir, fan, a switching
thing and perhaps a power relay. I got some help from a friend, who meant
that my old Volvo must have lost freezer liquid after 12 years, so he made
some operational things in the system but found no missing agent. Then it
could be the fan, which use to be one of the first parts to making trouble
with time. Not the fan. OK, the compressor. No failure there either. The
magnetic clutch? Nada. The temp sensors? Nada. OK, said my friend, now I
got it. You just need change the power relay that tells the clutch to rotate
the compressor. Where is that, I asked. Use to be somewhere behind the
instruments, said my friend. Very right, after some demounting of ashtray
and fuse boxes, I found a board with 12 relays. Took me an hour to find out
how on earth they had pressed that big thing throug the little hole in the
panel. No drawing. I deplugged the first relay, decapped it, Ohm'ed it and
connected it to 12 Volts. Worked. Next relay, wasn't that. Went through all
12 relays, no failures. Forced the relays to operate after starting car at
least 25 times. Began to suspect a mystic regulator box with innumberable
wires in and out plus a number of pneumatic plastic tubes. The press button
to start the AC was there, disassambled the unit to test the switch, but
there were no wires, just a plastic lever that operated something in a
closed box. OK, then let's have a look at that PWB with lots of component on
both sides. Aaahh, the heart! My experienced eye found a cold soldered
joint within a couple of minutes. I sucked up the bad solder and resoldered
the relay pin, put all things back, and ...alas... when depressing the AC
button, there was a click, the motor rpm lowered when compressor started
and the cool air came within 20 seconds. But....as the law said....I began
in the wrong end and had to slaughter most of the instrument panel. See
the photos and feel horror.
Quod eram futurus probo
/Inge
----- Original Message -----
From: "Brian Ellis" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, July 13, 2009 3:25 PM
Subject: [TN] NTC (It's not Friday, but this is so true!)
> THE LAWS OF ULTIMATE REALITY
>
> & Law of Mechanical Repair
> After your hands become coated with grease, your nose will begin to itch
> and you'll have to pee..
>
> & Law of Gravity
> Any tool, when dropped, will roll to the least accessible corner.
>
> & Law of Probability
> The probability of being watched is directly proportional to the
> stupidity of your act.
>
> & Law of Random Numbers
> If you dial a wrong number, you never get a busy signal and someone
> always answers.
>
> & Law of the Alibi
> If you tell the boss you were late for work because you had a flat tire,
> the very next morning you will have a flat tire.
>
> & Variation Law
> If you change traffic lanes, the one you were in will always move faster
> than the one you are in now (works every time).
>
> & Law of the Bath
> When the body is fully immersed in water, the telephone rings.
>
> & Law of Close Encounters
> The probability of meeting someone you know increases dramatically when
> you are with someone you don't want to be seen with.
>
> & Law of the Result
> When you try to prove to someone that a machine won't work, it will.
>
> & Law of Biomechanics
> The severity of the itch is inversely proportional to the reach.
>
> & Law of the Theatre
> At any event, the people whose seats are furthest from the aisle arrive
> last.
>
> & The Starbucks Law
> As soon as you sit down to a cup of hot coffee, your boss will ask you
> to do something which will last until the coffee is cold.
>
> & Murphy's Law of Lockers
> If there are only two people in a locker room, they will have adjacent
> lockers.
>
> & Law of Physical Surfaces
> The chances of an open-faced jam sandwich landing face down on a floor
> covering are directly correlated to the newness and cost of the
> carpet/rug.
>
> & Brown's Law of Physical Appearance
> If the shoe fits, it's ugly.
>
> & Wilson 's Law of Commercial Marketing Strategy
> As soon as you find a product that you really like, they will stop
> making it.
>
> & Doctors' Law
> If you don't feel well, make an appointment to go to the doctor, by the
> time you get there you'll feel better. Don't make an appointment and
> you'll stay sick.
>
> & Law of Logical Argument
> Anything is possible if you don't know what you are talking about.
>
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