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To replace the heater controls in a 1988 Toyota 4Runner, start by disconnecting the negative battery terminal for safety. Remove the dashboard trim surrounding the controls, typically by unscrewing or prying it off gently. Next, unscrew the heater control unit from its mounting, disconnect the wiring harness, and pull out the old unit. Install the new heater controls by reversing the process, ensuring all connections are secure before reassembling the dashboard.

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2mo ago

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