Air-mix on your 430
Air-mix on your 430
Trying to figure out if my air-mix servo(s) are acting up or is it just the normal operation.
I have noticed this particularly when it is very cold (below 30 is very cold for us the South) and the car has been sitting overnight but it seems the temperature is kind of wacky. For instance, I am driving to work, car is fully warmed up and I normally don't take my jacket or fleece off so I don't want it to be 80 degrees in the cabin. I set my system to manual mode and put the temp to lets say 68 degrees. The air coming out of the vent will be much hotter, like around 80 degrees.
At times, it just seems to be getting really hot so I set it to max cold and it works as it should. Pumping in full cold air form the outside. Anyway, the servo's are not making any weird noises or anything as in normal failures. Just trying to figure out how much is manual and how much is the system doing things by itself. Basically, is it normal to have a 15 or 20 degree difference between max cold and 66 degrees. This does not seem right but if the servo is looking at cabin temperature vs air temperate coming out the vent then maybe it is.
Also, I think there is some kind of mode you can put the HVAC in to let you know if the servo detected any error. Don't know if anyone knows about this. A few Lexus dealers I called mentioned that they system is very automated, even in manual mode and LS430's are not known to have problems with the air/mix servo's compared to other models.
I have noticed this particularly when it is very cold (below 30 is very cold for us the South) and the car has been sitting overnight but it seems the temperature is kind of wacky. For instance, I am driving to work, car is fully warmed up and I normally don't take my jacket or fleece off so I don't want it to be 80 degrees in the cabin. I set my system to manual mode and put the temp to lets say 68 degrees. The air coming out of the vent will be much hotter, like around 80 degrees.
At times, it just seems to be getting really hot so I set it to max cold and it works as it should. Pumping in full cold air form the outside. Anyway, the servo's are not making any weird noises or anything as in normal failures. Just trying to figure out how much is manual and how much is the system doing things by itself. Basically, is it normal to have a 15 or 20 degree difference between max cold and 66 degrees. This does not seem right but if the servo is looking at cabin temperature vs air temperate coming out the vent then maybe it is.
Also, I think there is some kind of mode you can put the HVAC in to let you know if the servo detected any error. Don't know if anyone knows about this. A few Lexus dealers I called mentioned that they system is very automated, even in manual mode and LS430's are not known to have problems with the air/mix servo's compared to other models.
Last edited by Lavrishevo; Jan 6, 2014 at 11:51 AM.
I did answer part of my own question. The temp setting is directly related to the cabin temperature not air temp sensor coming through the vent. So, I guess it makes sense to have very warm air coming through even though it is set to 66 degrees. If the outside temp is lets say 27 and inside the cabin is 45 it's going to blow hot air until it gets to 66 degrees.
Last edited by Lavrishevo; Jan 6, 2014 at 01:28 PM.
Pole Position
Joined: Dec 2013
Posts: 277
Likes: 8
From: Minnesota
There should be a temperature setting called "max cold". I believe that the car doesn't pass any heat to the cabin in this configuration, so the temp should match the ambient temperature.
I adjust my car to "max cold" when I first start it up because I want to keep all the heat in the engine and bring it up to operating temperature quickly.
I adjust my car to "max cold" when I first start it up because I want to keep all the heat in the engine and bring it up to operating temperature quickly.
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