Did you run thru the entire test procedure? That will tell you where
the problem is. If you apply 12v directly to it and it does not come up
then yes I would say the coil is bad. If it does come on the problem is
elsewhere.
On 9/14/2013 6:32 PM, Dan Penoff wrote:
Eldest son and I did a little diagnostic work on the 92 300E 2.6 ACC tonight,
and I want to run our findings by the group to see if the consensus is we're on
target.
Complaint: No AC
Presumed failure: AC compressor clutch coil
Diagnostics:
Checked for signal to coil - get it, but for just a second or two.
Connected a new coil to the corresponding wire in the connector, leaving the
Hall Effect transducer connected. With the engine running when the ACC is
turned on, the coil energizes for maybe a second, evidenced by holding a
screwdriver shaft next to it.
Applying +12VDC to the existing coil results in nothing - no click, no spark at
the terminal when power is applied, nada. Tests for both continuity and
resistance indicate an open circuit.
Based on my understanding of the ACC system in this car, the results we're getting show
that if the compressor was turning when the system is turned on, the clutch would
energize as expected. Because the compressor is not rotating, I am assuming the Hall
Effect pickup on the compressor is "telling" the system to de-energize the
clutch to prevent damage.
Yes? No?
A safe bet that we've got a bad AC clutch coil?
We have the holding tool and puller courtesy of AutoZone, so we're ready to
tear into this bad boy in the morning and get this poor sweating kid some AC.
TIA,
Dan
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