S'view,
Yeah, I don't know what kinda silly game MBUSA is playing with the FSM CDs.
I've sent you a link to another source.

You're Two for Three on Mr. Dalton's test sequence.

Both of your different "Sensors" wiring for the Auxiliary Fan System are working properly. (Tests #1 and #2, Which you've completed.)


You've proven the Low Speed Fan circuit works by jumpering S32 the sensor.

only two things would keep the Low Speed Fans from activating, NOW:
1. Low Level of Refrigerant in the A/C system.
['Not enough Refrigerant = s No Pressure/Temperature to "trip" S32]
2. Bad S32.

How did the nonworking fan react to a diagnostic "whack"?

Picture of S32 below.
Test it by turning on A/C with the engine ON,
UNPLUG THE SYSTEM'S WIRING FROM THE S32 CONNECTORS.
OTHERWISE THE SYSTEMS VOLTAGE/AMPERAGE WILL BLOW THE MM!
Connect leads of multi-meter to the two S32 connectors.
With MM turned to "Continuity" the S32 should show a Closed
Circuit.

When the A/C is On How well does it "Cool" ?

Attached Thumbnails

 

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'84 300SD sold
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