The aux fan should run at low speed when the A/C pressure reaches 16BAR (red drier switch).
There is a relay (position letter D) for that & a ballast resistor (beside the brake booster).
Many times the fresh air/ recric vacuum element doesn't close off the fresh air & that is the cause of POOR cooling A/C systems.
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MERCEDES Benz Master Guild Technician (6 TIMES)
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44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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