The controller is located on the evaporator box, under the right plastic cover in the engine compartment near the windshield. There will be two similar connectors, one to the controller, one to the receiver drier pressure switch. On 88- cars the connector goes directly to the controller, there is no "pigtail" off the controller. You may have to remove the false bulkhead partition to get to the connector. One 12 mm bolt on the right side and one 25 Torx screw on the left side holds it down. It fits in a groove rather snugly and may take a bit of force to pull up. All the controllers sit down in the evaporator, held by four 10 Torx screws. They are black boxes about 4" X 4" in size. No need to remove the actual controller, just its connector to test.

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