BradFerg Posted August 10, 2019 Share Posted August 10, 2019 2008 RX350; AC cools with the temperature set to LO. Raising the temperature setting 1 degree above LO and you only get hot air. What would cause this. Have basically lost control of the cooling temperature. Quote Link to comment Share on other sites More sharing options...
Paul Cook Posted August 10, 2019 Share Posted August 10, 2019 I own an ls400 and sc430 so I have no specific information about your model specifically, but there are some additional things to check. Does changing the dual control feature have any impact? Does the heater work? Is that temp controllable? The cooling system is pretty complex. Without having specific schematics for your vehicle, I dont think I can be much help. You need to have a diagnostic scan run and hope it comes up with something that could be useful. But considering how everything is tied together here, this might be a dealer issue or at the very least, one very good mechanic. Good luck and let us know what the resolution is when you get one. Paul Quote Link to comment Share on other sites More sharing options...
BradFerg Posted August 14, 2019 Author Share Posted August 14, 2019 Problem resolved. A sensor had not been re-connected after replacing the evaporator. This sensor uses the ambient temperature in the car to make adjustments to A/C and heating. Without the sensor, the only A/C setting that worked was LO since this by-passes and/or does need the ambient temperature in the car. Quote Link to comment Share on other sites More sharing options...
Paul Cook Posted August 14, 2019 Share Posted August 14, 2019 Very nice. How did you find that disconnected sensor? Hope it was you and it was free. 😁 Paul Quote Link to comment Share on other sites More sharing options...
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