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To replace the idle air control (IAC) valve on a 1990 Geo Tracker, first disconnect the negative battery terminal to ensure safety. Locate the IAC valve on the throttle body, then remove the electrical connector and the mounting screws. Carefully take out the old valve and install the new one, ensuring it is securely fastened and reattach the electrical connector. Finally, reconnect the battery and start the vehicle to check for proper operation.

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1mo ago

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