Casaubond

13 hours ago, ColinBarber said:

Sounds like normal auto behaviour to me if the cabin temp isn’t dropping.  Once up to temp the air goes cold (well ambient and might feel cold if you have had 30+ deg air directed at you whilst the cabin was getting up to temp) and is directed to the body and away from feet. Adjust the vents or use manual air position selection if auto isn’t working for you.

Hi ColinBarber, possibly a Lexus quirk. No other car brand that I have travelled on actually blows cold air when the cabin temperature reaches its set point in cold climate - The usual observed behaviour is to reduce the blow of hot air to a minimum to maintain the temperature. I am messing with the fans to find an optimal position setting. 

When I go for the next service with Lexus I will raise this issue with them 

1 hour ago, wharfhouse said:

I have mine always set to auto - generally temperature of 20C in summer and 22C in winter. I do a lot of long journeys and never had a problem - the car maintains what I set it at for the whole journey and I finish with it feeling the same temperature as when I start after the cabin is up to heat). However I do notice that every so often on a long journey the car will for a few minutes circulate slightly cooler air - I thought that this might be some sort of process freshening the air in the car as it soon reverts back to what it was. I don't touch anything when this happens and the system then continues to maintain the set temperature after that. 

 Thank you, wharfhouse.

Your answer suggests my car has a problem, possibly a software problem, as it works very well with plenty of nice heat when it starts and until the cabin temperature reaches the set climate temperature on the auto setting. In my case, once the cabin temperature is reached, active cold air- from outside is pumped into the car through the static vents especially (the ones used for demystifying). It is not for a few minutes only, it is most of the time cold air, and the temperature in the car is not dropping overall but the blow of cold air in the face is soooo annoying. If I raise the temperature lets say from 20 to 21 the air becomes hot again - so the system does work , not sure why is set to blow cold air once it reaches the set temperature

I hope it is a software issue rather than some expensive failure of a sensor or such 

Hi,  Lexux 300h IS owner here, and I was shocked to find out the same problem, The car is 69 reg 300h F , and the climate works perfectly for the first 30 minutes or so, then when the temperature in the cabin gets to the set degree lets say 21, the cold air start to be pumped through the vents.

No other previous cars did that? has any solution been found? do I need to contact the dealer?