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International Automotive Technicians Network
Re: Subaru HVAC
Posted to HVAC Forum on 8/29/2020

-40F usually indicates an open circuit for AAT, OAT, CTS, & ECT sensors.

Newer Auto-HVAC systems use ECM/PCM/TCM data and who knows what else as inputs.

The slowed or delayed sample rates as the linked article mentions concerning the AAT input is to compen... Login to read more.