hey guys.. i have a 99 GS300 ...
i have been having problems with my Air Cond ever since i got the car .. and my dealer couldn't seem to fix it ..

the problem is the Imbalance Temperature between the Driver Side and the Passenger Side ..
in other words.. when both are set to the temperature .. let's say 25 degrees celcius .... my driver side is giving me cool air (right feeling at about 25 degree) while the passenger side gives me HEAT !

my dealer said even Lexus Canada hasn't heard of that problem before.. and there is only one car other than me that experience the same problem ...

they said they are going to torn out the whole thing (including the center console) and replace the new system for him ..

then they will tell me if it works or not ..


that's soooo STUPID !!!! giving me HEAT at 25 degrees ?!?!?!?

 

Are you sure they checked the solar radiation sensors?

At the bottom of the windshield on each side of the defrost air outlet is a solar radiation sensor. If the driver side has failed in a manner (open circuit?) which indicates to the ECU that the sun is shining BRIGHTLY you would have the symtoms you describe.

Or the sun IS shining brightly and the passenger side sensor doesn't "know" it.

Wait! Sorry isn't 25 degrees C fairly WARM?

72 degrees F?

 

hmmm..it happens during night time too...
so i guess it's not the Solar Sensor ~

25 C = 77 F

but still, it shouldn't give me heat

;-P

 

Hey guys, I got the same problems, but mine is on both side and all it does is blowing cool air from 65 to 84 degree the only time it give out heat is when i put in 85 but that is wicked hot....i have know idea what happen i wonder if anyone have experience the same thing and let me and HaydenGS know what cause it. Thanks!

 

Only cooling....

Your ambient, cabin, air temperature sensor is shorted, an extremely low resistance indicates HIGH cabin ambient and all you will get is cooling airflow except at max heat.

Inbalance....

Your car doesn't know its nightime so if the (failed) driver's side solar radiation sensor indicates a BRIGHT SUN then the system will try to keep the driver's side "cool"

 

Go willard it's your birthday..GO GO GO!!!

"Willard West..you better not mess with his AC" or he'll freeze yo booty ***!!!

 

Thanks for the reply willard west, do you happen to know where is that sencor located or how to fix it.
thanks

 

I am still a little confused. What is the solar radiation sensor. How does that ditermine the temp, and why would it need to keep the drivers side cool and the pasenger side warmer.

Right now Its getting warm and I like to keep the temp in my car around 72 degrees. I noticed the drivers side is coming out cool and the pasenger side is just air not cool.

 

hi guys...i am having the same problem

my drivers side air is cold...but my passenger side is noticeably warmer...i have turned off the 'dual' and both are set at 65 degrees F

i recently had the 120k service done, but i don't think they did anything w/ the freon

any thoughts?

 

I went to Sewell Lexus and looked up these sensors.
I still dont know how to read the problems codes. I pressed the Auto and AC button at the same time and turn the ignition to ACC and then What? where do I read the problem codes.

Lexus OEM Cooler Thermistor (solar)
Item: 88625-50110
available $98.85


Thermistor, Cooler (Ambient Temp. Sensor)
Item: 88790-22130
available $15.20


Lexus OEM Cooler (Room Temp. Sensor) Thermistor
Item: 88625-50120
Available $28.77

 

I am having a similar problem that hopefully someone can help me with.

My AC is only blowing very cool air when set at 65, but once it is placed above 65 it starts to blow warm air...any ideas???

Thanks

 

my car is at dealer right now the passanger side is blowing 10 degrees warmer than the driver side causing the car to be hot on very hot day driver side pretty cool but not enough the the passenger side is blowing out just 70

 

i have the same exact issue as you bro....please let us know what you find out from the dealership.....

summer is here and everyone is cranking the AC...seems like this issue is affecting a lot of GS owners

 

I am just guessing..... from reading some of the posts. This is just a guess.

For disbalance on zones I think this would be the sensor needed.
Lexus OEM Cooler Thermistor (solar)
Item: 88625-50110
available $98.85

When you have to put the temp to extremes to get cool or hot temp, I think this is the sensor you need.
Lexus OEM Cooler (Room Temp. Sensor) Thermistor
Item: 88625-50120
Available $28.77

As soon as someone that knows or has had this issue reads this Please let us know. It is getting very hot and we need to stay cool.

thanks

 

badrides - did you ever get your car back from dealer? what did they diagnose as the problem and solution? any help would be greatly appreciated.