Hi All .. Posted this question in the wrong section last night but TommyOTool still gave me an answer which was great and I know you guys are a mine of information ..

I recently bought a 2008 LS600h RSR with all the toys working apart from the Air Con.. well it sort of works ..
This vehicle has 4 zone climate control Air Con front and rear compartments .. from cold I get in and select the Maximum Temperature .. ( its always cold in Manchester UK ) and drive off down the Motorway / Highway and all seems normal .. the car heats up as it should nice and toasty .. but when I have to slow down in a queue of traffic or when I stop and just keep the engine running it always starts blowing cold air without me touching the temperature controls and it dosn't make any difference which Zone is selected

Does anyone have any ideas or experienced this before .. not sure if a temp sensor is on the blink or something more serious
Any positive suggestions or ideas would be more than welcome ..

Thanks .. Malcolm

 

Check your antifreeze level. If it is even a little low it will do that.