I also have a 2000 jeep wrangler. This year has a problem with the heater core plugging up. You can either try to flush it out, or just replace the heater core.
Follow the wiring harness from your blinker. Disconnect the factory harness from the relay. Replace with the new relay.
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No, Wrangler x is a stretched out version of a Wrangler, the top is longer.
Internal Wrangler was created on 2000-05-01.