Date: Mon, 19 Oct 1998 19:23:00 GMT
From: "Geoff" <Jeffe_Verdenopsamail.com>
Subject: Re: Radiator fan  1992 9000s


Just went thru this one myself- The fan is a two speed fan. It **MUST** be running at low speed before the high speed switch closes, or you'll blow the fuse (too much resistance trying to start up the fan from stop). When the car's warm, does the fan come on at all, or does it just creep up to warm-high, and then pop the fuse? If the former, then you've probably got a bad fan, but if the fan never comes on, then it's the problem above. There are several things that can affect this- the radiator temp switch, the fan relay (gold anodized piece mounted off the fan), wiring, etc. But most likely is the rad. temp switch. To check it, you can use a short jumper to jump between the leads on the temp switch plug (mounted low on the right side of the fan). If that worked, you've found the problem. Changing the switch is pretty easy, with one ***MAJOR WARNING*** Your radiator has plastic ends, and it's VERY easy to split the nipple that the switch threads into. If this happens, you've just turned your $50 repair into a $500 one (ask me how I know). One other warning -- I don't how common it is, but the new switch I got from Saab was defective (as I found out after removing/replacing it 4 times - which lead to my learning about the $500 plastic nipple). To save yourself some potential trouble, you can test the switch by putting it in a shallow pot of water on the stove, with a thermometer in the water, and a multimeter across the switch, and bringing it to a boil. I *think* the low temp switch should close at 180-190 F' (it's stamped on the thermostat) -- but the low temp is definitely below boiling. Hope this helps, Geoff >Looking for ideas on what the problem may be, > >When the engine gets hot and the fan is called for, the 30 amp fuse blows. >There are 2 fuses that are labeled fan in the engine compartment. The top, >or towards the rear of the car, fuse is the one letting go. How and what do >I need to test? > >Thank you > >

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