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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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