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Can you slide the fan speed to the right and get the fan to blow on high? The B1 socket is for the ECC and if you get 1-1-1, that doesn't mean that the 2 sensors above the front doors are clean enough to keep the temperature constant.
On your next long trip when the fan slows down and you are still warm, turn the temp dials (both) to the blue mark. That is supposed to signal the ECC to go to max cooling.
Do you have a fresh air filter installed? If not, put one in. If yes, check it for dirt.
Klaus
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(1975 164, 1995 854T, 1998 V70R)
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