Thread: Heat sensor switch on a/c - is that a ground?
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Old 07-30-2020, 12:35 AM
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280EZRider 280EZRider is offline
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Join Date: Jul 2007
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The switch you show does indeed complete a ground, thereby activating at 100c the aux fan by way of the aux fan relay. However this switch senses engine coolant temp.

The switch that senses R12/134A temp at the receiver/dryer has 2 connectors to complete the circuit and activates at 62c the aux fan thru the same relay.
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