My A/C problem is back. Now the clutch is always engaged on my '90 TE 124. The clutch was erractically chattering in and out but then locked in. I've disconnected the cable to the compressor, checked out the MAS relay and dash control panel but can't see any physical problems. Are there any other relays or modules that control this A/C system? Are there any diagnostic tips out there? TIA.

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Ian Read
90 300TE4MATIC (124)
79 300SD (116)