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Re: Rear Window Heater
Posted by Stephen Goldberger (more from Stephen Goldberger) on Fri, 9 Nov 2001 11:06:23
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>My saab 9000 cdt rear window heater seems to be barely working. 

The window heater is a relatively simple resistive heater circuit.  If it's
working at all, that means the swtiching, wiring, and fuse are at least
sort of OK.  If it's not working well, that means there's a resistance
where there shouldn't be.  Check all the connections, especially where the
heater is grounded.  A bad connection should be plenty hot.  You might also
check the resistance of the grid.  What's the spec?  I don't know, but look
at the fuse - say it's a 20 amp fuse, assume it's at most twice the design
current, implies (with a 12 volt source) about 1.2 ohms to give 10 amps.
if the grid measures something like 5 ohms, then the problem is in the grid
itself - perhaps the painted-on resistive circuitry has oxidized over the
years.
Stephen Goldberger, Editor and Publisher
NINES, the magazine of the SAAB Club of North America
vist our web site at http://www.saabclub.com
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