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2005 Caddy SRX much colder on right side

infj23 on Tue October 02, 2012 11:37 PM User is offline

Year: 2005
Make: Caddy
Model: SRX
Engine Size: V6

2005 Caddy SRX
107K Miles

Except that the A/C is much colder on the right side (dash vents blow about 15 degrees colder), the system seems to be working well. I get heat when I want heat, but when it is warm out, the AC is too cold to stand on the right side. Later in the day, when the sun is less direct, a fog appears on outside of the windshield, just about the defrost vents--right side only.

My suspicion is a blend door problem. There is a sound, and irregular rubbing kind of sound, that appears to come from the behind the center of the dash. My uneducated guess is this is a blend door trying to do something but not able to do it. The sound is audible with key-on-engine-on as well as key-on-engine-off. I recorded the sound it makes; you can hear it HERE.

I checked my alldatadiy subscription for guidance. My car apparently has four Actuators: Mode, Recirc, Air Temp-Left, and Air Temp-Right. Any good guesses out there, assuming I'm on the right track of which of these I should check first? Or, am I completely off base?

Thanks to all!

GM Tech on Wed October 03, 2012 8:43 AM User is offline

You suspect blend door-- I suspect charge level,,,,65% of a/c failures are due to loss of refrigerant-- so I play the numbers....about 2 % are due to blend doors....Have the refrigerant pulled out and weighed and you'll know for sure- then if you get the right amount out- go for your blend door theory...

Refrigerant boils off on side of evap that feed passenger side first- then there is nothing left for driver's side- if you could feel evap- passenger side would be cold- driver's side warm--due to half or less of necessary refrigerant charge in system-- give yourself another 6 months and you' complain of no cooling either side- you are seeing the initial symptoms of a leak-

if you determine charge level is low- then find and fix your leak.....

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

ezautoac on Thu October 04, 2012 10:39 PM User is offline

+1 and checking refrigerant level is sooo much easier than checking the blend door!

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