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The ZJ including '94 did not come with an electric fan. I would look into your fan clutch being bad, this is attached to the cooling fan via the water pump.

First, would be to check whether or not the electric fan is coming on. Set the emergency brake for safety, make sure the Jeep is in park, hood open, motor running, turn on the AC and see if the electric fan (located against the inside of the radiator) is running. If not, that would be your root problem, and answer why it seems to only happen when the AC is on. If you have a bit of testing background, unplug the fan itself (the plug is located on the left side of the shroud), and see if there is 12v from the feed (not the fan) side. If there is, there's something worng wirth the fan itself, if not, it's more than likely the relay.

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Q: 94 Jeep Grand Cherokee runs hot when the air Conditioner is on good otherwise what would cause this?
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