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Good question about AC version as you are right, a 380SEL would not be a US car and as such could have manual or climate control AC controls.
In either case the problem is the heater valve (mono or duo valve) is closing. The first step is to see if it is powered and control side grounded. The system closes the valve by grounding the control side with the other side always hot (with the key on). Lack of power or lack of ground allows the valve to go full open. Once one finds what is missing comes the next step.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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