Re: strange fan problem... - Saab 9000 Bulletin Board - Saabnet.com
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Re: strange fan problem...
Posted by Lu (more from Lu) on Fri, 15 Aug 2003 08:40:18
In Reply to: strange fan problem..., Chris M, Fri, 15 Aug 2003 03:40:53
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Do you have voltmeter?
Relay fuse box in front of battery'
two fan relays, pull the low speed relay and slip cover off of it.
Use volmeter to measure sockets where relay plugs into. You will see diagram of relay on cover. Find batt side of power contacts and of coil. Thermoswitch will give ground to activate the relay if working properly. Insert naked relay. Move contactor by finger pressure to see if fan works. Run engine to high warm range. You should see voltage disappear on thermoswitch side of coil as switch makes to grd.
You can have a bad thermoswitch (most likely), bad relay (next likely), bad relay sockets, corroded wires from thermosw. to relay box.
If you remove cover of high speed relay and have them both plugged in naked you can test low and high speed function. 12 V doesn't shock so with dry fingers (wipe off beer can sweat from hand before this) hold low speed relay in to run slow fan, keep it there and make the high speed relay. This will act in same manor as the thermosw. Low makes and holds if temp goes higher the low stays made and the high makes to grd.
posted by 199.184.1...
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