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I suppose you could check the relay that controls the CHS pump. Lives in the relay box above the engine valve cover.[ATTACH][ATTACH]...
x2 to bisco. Could be lots of things. Getting codes from all ecu's with a capable scantool would help narrow down the possibilities....
Me, I would use a "Prius capable" scantool to watch what the evaporator core temperature sensor reads - both when the system works and...