Flashing A/C
09-05-04, 06:02 PM
#17
Originally posted by mburnickas
It is good to see this is an easy fix. I am just saying I have seen it in the book. I might look into a fix but then again if it is not broken.......Kind of a catch 22.
Could you post the easy fixes?
It is good to see this is an easy fix. I am just saying I have seen it in the book. I might look into a fix but then again if it is not broken.......Kind of a catch 22.
Could you post the easy fixes?
Last edited by RTIS250; 09-05-04 at 06:04 PM.
09-05-04, 08:12 PM
#20
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RT Camaro,
My 2004 GX had the air conditioner Technical Service Bulletin (TSB) dated January 2004 performed two weeks ago wherein Lexus replaced the condenser, expansion valve, added enhanced insulation to various high/low refridgerant lines along with adding seals to the Recirc and fresh air flaps. Nevertheless, the effect of this TSB did not enhance the cooling effect whatsoever given the high humidity environment. With an ambient temperature at 90 plus degrees with 90% humidity, the best vent temperature has been 47 degrees which easily fails the "comfort factor". Other Lexus models under the same conditions can easily get high 30's / low 40's in vent temperature i.e.2004 ES 330
If you live in Chicago, you would probably not notice the GX lack of cooling but if you live in Atlanta/Orlando, the GX's a/c simply cannot compete with temperature/ humidity in the southeast.
Given you experience with Lexus, do you have any suggestions and have you seen this problem with the GX?
My 2004 GX had the air conditioner Technical Service Bulletin (TSB) dated January 2004 performed two weeks ago wherein Lexus replaced the condenser, expansion valve, added enhanced insulation to various high/low refridgerant lines along with adding seals to the Recirc and fresh air flaps. Nevertheless, the effect of this TSB did not enhance the cooling effect whatsoever given the high humidity environment. With an ambient temperature at 90 plus degrees with 90% humidity, the best vent temperature has been 47 degrees which easily fails the "comfort factor". Other Lexus models under the same conditions can easily get high 30's / low 40's in vent temperature i.e.2004 ES 330
If you live in Chicago, you would probably not notice the GX lack of cooling but if you live in Atlanta/Orlando, the GX's a/c simply cannot compete with temperature/ humidity in the southeast.
Given you experience with Lexus, do you have any suggestions and have you seen this problem with the GX?
09-05-04, 10:41 PM
#21
Originally posted by Humid GX
RT Camaro,
My 2004 GX had the air conditioner Technical Service Bulletin (TSB) dated January 2004 performed two weeks ago wherein Lexus replaced the condenser, expansion valve, added enhanced insulation to various high/low refridgerant lines along with adding seals to the Recirc and fresh air flaps. Nevertheless, the effect of this TSB did not enhance the cooling effect whatsoever given the high humidity environment. With an ambient temperature at 90 plus degrees with 90% humidity, the best vent temperature has been 47 degrees which easily fails the "comfort factor". Other Lexus models under the same conditions can easily get high 30's / low 40's in vent temperature i.e.2004 ES 330
If you live in Chicago, you would probably not notice the GX lack of cooling but if you live in Atlanta/Orlando, the GX's a/c simply cannot compete with temperature/ humidity in the southeast.
Given you experience with Lexus, do you have any suggestions and have you seen this problem with the GX?
RT Camaro,
My 2004 GX had the air conditioner Technical Service Bulletin (TSB) dated January 2004 performed two weeks ago wherein Lexus replaced the condenser, expansion valve, added enhanced insulation to various high/low refridgerant lines along with adding seals to the Recirc and fresh air flaps. Nevertheless, the effect of this TSB did not enhance the cooling effect whatsoever given the high humidity environment. With an ambient temperature at 90 plus degrees with 90% humidity, the best vent temperature has been 47 degrees which easily fails the "comfort factor". Other Lexus models under the same conditions can easily get high 30's / low 40's in vent temperature i.e.2004 ES 330
If you live in Chicago, you would probably not notice the GX lack of cooling but if you live in Atlanta/Orlando, the GX's a/c simply cannot compete with temperature/ humidity in the southeast.
Given you experience with Lexus, do you have any suggestions and have you seen this problem with the GX?
09-06-04, 06:58 AM
#22
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RT,
What is interesting is that no matter what the ambient temp/humidity level (usually 80+%), the vent temp with RECIRC, manual mode, medium fan usually flatlines at 47 to 48 degrees. Thus, if it is 72 or 92 degrees, the vent temp will get to 47-48 degrees, NO LOWER even in sunny or rainy conditions. Thus, this leads me believe many troubleshooting scenario's:
a) a/c temp sensor by the right knee;
b) evaporator temp sensor;
c) electronics in the a/c amplifier;
d) evaporator is too small i.e. engineering flaw;
e) condensor i.e. to small;
f) solar sensor on the dash (long shot);
g) expansion valve not designed correctly?
The dealer brought R134a down a notch below spec but the effect of this was to feel the compressor cycle i.e. move from 47 degrees to 49 degrees vent temp. There was no real effect of this.
Thus, what is puzzling is why this vehicle cannot achieve the same cooling effect of other vehicles. If the condensor cannot remove the heat, then how come other vehicles don't require to removal of the wheel well flaps? Thus, are you saying that all (emphasis added) other vehicles are more efficient as to movement of air underneath the hood than the GX?
Anything you can offer as to possible solutions prior to discussing with the service manager again?
What is interesting is that no matter what the ambient temp/humidity level (usually 80+%), the vent temp with RECIRC, manual mode, medium fan usually flatlines at 47 to 48 degrees. Thus, if it is 72 or 92 degrees, the vent temp will get to 47-48 degrees, NO LOWER even in sunny or rainy conditions. Thus, this leads me believe many troubleshooting scenario's:
a) a/c temp sensor by the right knee;
b) evaporator temp sensor;
c) electronics in the a/c amplifier;
d) evaporator is too small i.e. engineering flaw;
e) condensor i.e. to small;
f) solar sensor on the dash (long shot);
g) expansion valve not designed correctly?
The dealer brought R134a down a notch below spec but the effect of this was to feel the compressor cycle i.e. move from 47 degrees to 49 degrees vent temp. There was no real effect of this.
Thus, what is puzzling is why this vehicle cannot achieve the same cooling effect of other vehicles. If the condensor cannot remove the heat, then how come other vehicles don't require to removal of the wheel well flaps? Thus, are you saying that all (emphasis added) other vehicles are more efficient as to movement of air underneath the hood than the GX?
Anything you can offer as to possible solutions prior to discussing with the service manager again?
09-06-04, 07:17 PM
#23
Originally posted by Humid GX
RT,
What is interesting is that no matter what the ambient temp/humidity level (usually 80+%), the vent temp with RECIRC, manual mode, medium fan usually flatlines at 47 to 48 degrees. Thus, if it is 72 or 92 degrees, the vent temp will get to 47-48 degrees, NO LOWER even in sunny or rainy conditions. Thus, this leads me believe many troubleshooting scenario's:
a) a/c temp sensor by the right knee;
b) evaporator temp sensor;
c) electronics in the a/c amplifier;
d) evaporator is too small i.e. engineering flaw;
e) condensor i.e. to small;
f) solar sensor on the dash (long shot);
g) expansion valve not designed correctly?
The dealer brought R134a down a notch below spec but the effect of this was to feel the compressor cycle i.e. move from 47 degrees to 49 degrees vent temp. There was no real effect of this.
Thus, what is puzzling is why this vehicle cannot achieve the same cooling effect of other vehicles. If the condensor cannot remove the heat, then how come other vehicles don't require to removal of the wheel well flaps? Thus, are you saying that all (emphasis added) other vehicles are more efficient as to movement of air underneath the hood than the GX?
Anything you can offer as to possible solutions prior to discussing with the service manager again?
RT,
What is interesting is that no matter what the ambient temp/humidity level (usually 80+%), the vent temp with RECIRC, manual mode, medium fan usually flatlines at 47 to 48 degrees. Thus, if it is 72 or 92 degrees, the vent temp will get to 47-48 degrees, NO LOWER even in sunny or rainy conditions. Thus, this leads me believe many troubleshooting scenario's:
a) a/c temp sensor by the right knee;
b) evaporator temp sensor;
c) electronics in the a/c amplifier;
d) evaporator is too small i.e. engineering flaw;
e) condensor i.e. to small;
f) solar sensor on the dash (long shot);
g) expansion valve not designed correctly?
The dealer brought R134a down a notch below spec but the effect of this was to feel the compressor cycle i.e. move from 47 degrees to 49 degrees vent temp. There was no real effect of this.
Thus, what is puzzling is why this vehicle cannot achieve the same cooling effect of other vehicles. If the condensor cannot remove the heat, then how come other vehicles don't require to removal of the wheel well flaps? Thus, are you saying that all (emphasis added) other vehicles are more efficient as to movement of air underneath the hood than the GX?
Anything you can offer as to possible solutions prior to discussing with the service manager again?
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