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Strangeness in the A/C system

2K views 3 replies 3 participants last post by  Riick 
#1 ·
I'm posting this in Camry, & Avalon forums.
My car is a Gen 3 Avalon (2005 Touring), but, I figure the 2nd Generation Avalon & recent Camry XLS have similar interior A/C layouts in the interior. Besides, someone may have had the same problem & found a solution already – why re-invent the wheel?

PROBLEM: If I've been traveling on a hot day with A/C on, at some point
after 3-4 hours, the air coming out of the REAR outlet starts to blow HOT.

Again, front A/C outlets still blowing nice cold air, but rear outlet blows really hot air.

If you shut the A/C off for 1/2 hour, (or shut the car down for 20-30 minutes),
when the A/C runs again, everything is fine again.

I think it must have something to do with icing (?) and the flaps on the ventilation system.

Anyone with either ideas, or a diagram of the system?

Thanks in Advance! - Rick
 
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#2 ·
This is a good one. The air goes from the blower fan to the mixing box to the vents. The air going to the rear should be the same stuff that flows from the dash. I presume you have an automatic temperature/ split system? Make sure that the right and left sides are both set to a low temp, say 70, and that the temp of the air on both left and right are comparable. Could be that one side is malfunctioning and affecting the mixer box.
 
#3 ·
T-SB-0143-08

Some customers may experience a condition where the rear center vents blow warmer air than the front center vents. A new HVAC servo motor has been designed to correct this concern. Follow the
procedures listed in this bulletin to remove and replace the HVAC servo motor

Old P#87106–07110 New P#87106–06250 Servo Sub-assembly, Damper

This entails complete dash removal and HVAC teardown. Expect at least a 10 hour labor charge plus the part which you'll have to call and get the quote.
 
#4 ·
T-SB-0143-08

Some customers may experience a condition where the rear
center vents blow warmer air than the front center vents.
A new HVAC servo motor has been designed to correct this concern.
Follow the procedures listed in this bulletin to remove and replace the HVAC servo motor

Old P#87106–07110
New P#87106–06250 Servo Sub-assembly, Damper

This entails complete dash removal and HVAC teardown.
Expect at least a 10 hour labor charge plus the part
which you'll have to call and get a quote.
Hey thanks !!!
I figured I wasn't alone, but, since the warranty's over and done with,
I think I'll just live with it till a rational fix is developed.

I'll bet $50 that this is going to be like my ancient BMW, where a $750
head unit for heater & A/C starts acting possessed after 10+ years;
...someone figured out that cause its a bad $.67 cent capacitor t
hat you can replace at kitchen table in 45 minutes.
Again, same sort of story with Chrysler Crossfires, dealer can repair
a mysterious 'no start' condition with a new part
- containing rat's nest of wires, connectors, & a circuit board
(Only $1,500 including diagnosis & installation).
Actual problem - 2 spots on these circuit boards have bad solder joints,
....reheat these joints, add 1/60 oz dabs of solder - permanently fixed.
:rofl2:
 
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