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Re: Cruise & ACC [saabnow]
Posted by The Saab Network (more from The Saab Network) on Tue, 12 Nov 2002 19:44:37
In Reply to: Cruise & ACC [saabnow], The Saab Network, Wed, 23 Oct 2002 11:54:50
Message from David Prantl
Subject: Re: Cruise & ACC
=================
> Well the cruise control vacuum is linked to the ABS pump I believe. It
This is incorrect. The brake systems and cruise control systems are
completely separate. They don't share a single component; Not even a
vacuum hose.
> The ACC problem is the regulator
Right. Or more accurately, it's the fan-speed resistor unit, which is part
of the Manual climate control (MCC) system. The ACC is the Automatic
climate control, which uses a stepless/transistorized fan speed control unit
mounted in a different location (in the evaporator housing) than this MCC
fan resistor (which is in the fan housing).
> there is the possibility of fixing the diode on the broken one.
Right, but it's not actually a diode. It's a thermal fuse, also called
Thermal Cut-Off (TCO). When the resistor pack reaches the fuse's tripping
temperature, the fuse blows and creates an open circuit. The reason you
still have functional maximum fan speed is that this speed bypasses the
resistor unit altogether. Unfortunately, the thermal fuse is not a
resettable device. Fortunately it should be relatively easily obtainable
from an electronics components vendor. If I recall correctly, the item to
get is NTE 8103. Specifications can be found here.
http://www.nteinc.com/specs/8000to8999/pdf/TCOs.pdf
This type of thermal fuse is also used in some household appliances, such as
vacuum cleaners (keep the motor from overheating and melting the case).
A new fan speed resistor pack from SAAB (part number 46 34 564) is nothing
short of highway robbery. It costs $95 ! Worst of all, it's nothing more
than a prettier-looking version of the old one, still featuring the good-old
thermal fuse that caused your problem in the first place. Check it out in
this picture. The thermal fuse is the diode-looking thing with the white
pointy end:
http://img.eautopartscatalog.com/live/R203286507OES.JPG
David.
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