Very weird issue with the climate control system
#1
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As it got cold here in the last couple of months I noticed a weird issue. I have my climate control system set on auto at about 73* but I noticed that at times it would get cold inside the car after it has already warmed up. After some investigating I determined that when the car is moving everthing seems to work fine. Warm air is coming out of the vents and the temperature is stable. But when the car stops (at a light for example) cold air starts coming out of the vents. I had my hand by a vent and I felt the air go from warm to cold as I came to a stop at an intersection. Is that weird or what? Anybody have an idea what is causing this?
#2
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do you have any type of defrost mode on?
I drove around all winter last year with the mode on defrost and the arrow pointing down at the footwells. Found out later that anytime the defrost symbol is activated, the AC gets turned on. Now that I have it off defrost mode, my mpg is lower by 1L/100km
I drove around all winter last year with the mode on defrost and the arrow pointing down at the footwells. Found out later that anytime the defrost symbol is activated, the AC gets turned on. Now that I have it off defrost mode, my mpg is lower by 1L/100km
#4
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Dude I have the same exact issue. 2007 IS250. I can put mine on 85 heat and as long as I'm driving its hot hot but if I stop at a light its like a/c cold. One the engine is completely warmed up its less noticeable but still happens some. I have even gone to the point of if my rpm is above 1000 its fine. Somebody has to know what this is. I'm worried something is going out.
#5
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Join Date: Dec 2011
Location: AZ
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I don't know if the Lexus cooling system is anything like the BMW that I just had. But that is a symptom of a cooling system that hasn't been bled properly on a BMW. Did you have any part of your cooling system worked on recently?
#7
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Dude I have the same exact issue. 2007 IS250. I can put mine on 85 heat and as long as I'm driving its hot hot but if I stop at a light its like a/c cold. One the engine is completely warmed up its less noticeable but still happens some. I have even gone to the point of if my rpm is above 1000 its fine. Somebody has to know what this is. I'm worried something is going out.
Does anybody know what is causing this? I'm out of warranty so I would prefer not to take the car to the dealer as to avoid having to take out a second mortgate on my house.
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#10
#11
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As it got cold here in the last couple of months I noticed a weird issue. I have my climate control system set on auto at about 73* but I noticed that at times it would get cold inside the car after it has already warmed up. After some investigating I determined that when the car is moving everthing seems to work fine. Warm air is coming out of the vents and the temperature is stable. But when the car stops (at a light for example) cold air starts coming out of the vents. I had my hand by a vent and I felt the air go from warm to cold as I came to a stop at an intersection. Is that weird or what? Anybody have an idea what is causing this?
Dude I have the same exact issue. 2007 IS250. I can put mine on 85 heat and as long as I'm driving its hot hot but if I stop at a light its like a/c cold. One the engine is completely warmed up its less noticeable but still happens some. I have even gone to the point of if my rpm is above 1000 its fine. Somebody has to know what this is. I'm worried something is going out.
Could be. OP check for leaks too. Never hurts to look around the engine bay every now and then.
Last edited by LEXtegra; 12-30-11 at 02:33 PM. Reason: typo