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Old 06-18-1999, 07:16 AM
Posts: n/a
I too have modified the cooling system on my 92 190E2.6. In warm weather the ac performance is poor at idle and the temp rises to the 100c mark. Instead of waiting for the ac freon switch to activate to turn on the aux fans, I instead installed a relay to power the fans at a low speed via 2 25w .25 ohm resistors and triggered by the deceleration switch on the throttle body through a transistor(high impediece) to activate the above relay. This allows the fan to be on only at idle. Works great and the ac works better than it ever has and the temp stays at 90-90c.