My cars is doing the same thing I have resoldered the push button control unit , replaced mono valve with kit , tested mono valve it turns off when it is suppose to per climate control manual, but all it does is full hot or cold. I have replaced the foam hose for the in car sensor, could it be the climate control unit? Thanks for any help

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84 300 Turbo / 320,000
96 E300 D / 55,000