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Old 02-06-2012, 07:28 PM
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compress ignite compress ignite is offline
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Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
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This is how the FSM wants you to test compressor Speed Sensor

(Remember the FSM,Most of the time,requires you to remove your Cranium and
install the Deutschlander Operating Chip)

[Add to that we're talking about Two(2) different speed sensors:
One on the Comp and One on the Flywheel.(There's also one on the Speedo)
AND you're testing the Comp. Speed sensor at a location other than that
recommended by the FSM.And I'm not so assured of the results.]

PROCEDURE:

Set DMM to A/C Voltage and then check Sensor @12 point connector.

[I HATE it ! When I suspect the "rebuilders" just R+R the OLD Sensor on the Reman Unit.]

It's a "Hall Effect" rotational sensor.
So there's an "Air Gap" between the end of the Sensor and the Compressor's Shaft.
[And given that scenario,I'd imagine there's No Seal Between the Sensor and the Refrigerant.]
[My luck so far has held, on Mercedes, So I've never had to replace a Comp. Sensor.]
Attached Thumbnails
New AC compressor not coming on-screenhunter_03-feb.-06-18.25.gif  
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Last edited by compress ignite; 02-06-2012 at 07:43 PM.
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