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The sender on the thermostat is merely a temperature switch. It grounds the connector at 38C to flip on the climate control blower. Simple as that. If it fails in the open position then your blower will not come on unless you ground the connector. This happened on our 300D. I could ground and un-ground the connector with the car off but climate control on, and could hear the relay in the CC clicking when I grounded it.
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