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Let's stick with the Fan for now... 900 1993

uid 18083's pic
posted by  lucid on  Tue Jul 27 08:05 CST 2010
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

"I...find your post valuable in explaining the fan logic."

Thanks, Chris. If you mean just the messy first paragraph, I'll try to clean it up below...
--------------------->

Engine Cooling Fan Control (based on '93 940 wiring)

The Fan Control relay down in front of the Battery should have a constant 12V coming in from the Battery (fusible link) at Terminal 1A. This 12V is routed internally to the relay's High and Low speed coils. Either coil can be energized by a grounding wire from 1 of 5 sources:

High Speed Coil Ground - white/black wire from either:
1) Radiator thermo-switch
2) Gray pressure switch on condenser
3) LH2.4 ECU pin 11 (on cars so-equipped)

Low Speed Coil ground - Blue/Black wire from either:
4) Brown pressure switch on condenser
5) LH2.4 ECU pin 10 (on cars so-equipped)

NOTE: The Fan relay's internal circuitry allows only one coil to be energized at a time, with the High speed coil having top priority.

<------------------------
That reads better to me. Or did I muck it up?
If it's OK, you have my blessing to give it to Steve.
Or give me your edit input if I overlooked something.








--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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