Here's a tip to make the removal and installation of dash control cables much less difficult. First, disconnect the battery (good to do when working behind the dash as there may be exposed "hot" terminals). Then, disconnect the cable from what it is controlling, for example, the heater valve. Thread an appropriate sized deep-well socket over the cable to the retaining nut, and with a pair of pliers or vise-grip, turn the socket to loosen the nut. It's much easier than trying to get a wrench in there.

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