smwallace

I have a 2007 ES350, and have found that the rear vents blow HOT air even when the A/C is set low and the front vents are blowing cold air. Does anyone know how the ventilation system is controlled (i.e., where the thermostats are, how the ducts are run from the A/C condensor and heat exchanger)? I suspect that the thermostat that controls the air for the rear vents is OOC, but when I asked the dealer about the problem at the 5k service, I was told that there is no separate thermostat for the rear vents.

Thanks,
Steve

YotaCarFan

Sounds like you have an early build that has a defective servo motor in the HVAC system. There's a TSB out for this very issue. Take it to the dealer; the service dept should know exactly what the problem is and be able to fix it.

codex57

AC002-07

Tell them to look up the TSB by that code.

onepointon

Interesting. I wasn't aware of this issue, nor that TSIB.

I picked something up.

ng123ray

i have the same problem... i never addressed it because i never have people in the rear seats... but one time i did and they told me to turn off the heater when i had AC on full blast....i thought it was because the ducts ran close to the exhaust where it gain heat and blew it out to the rear seats... hm... time to make another trip to the dealers...

smwallace

YotaCarFan & codex57,

Thanks for the tips. That's the beauty of this website -- lots of good info!

Does anyone have a copy of the TSB? It's not in the TSB sticky note.

Thanks,
Steve

justfixit

Here it is:

smwallace

Excellent! I'll call my dealer today.
Thanks, Steve

MD350

I never tested my car for this. Now I know.

Great info, members. Keep it coming!

codex57

You can access that na.tis.toyota.com site right? It's in there if you're ever bored and want to just skim through the list of TSBs. You don't even have to open it up. The summary lets you know the problem.

Oh, can you tell me the levels of different Toyota/Lexus techs? I've always been curious. Like where a Master tech is in relation to... uh, whatever else there is.

justfixit

Basically there are only two different certifications for service techs or diagnostic specialists.
Master must have at least 36 months experience and 8 ASE certifications
Senior must have 18 months experience and 4 ASE certifications
Originally master had to have 60 months and senior 36 months.
There are training courses that both must have also but just attendance gives a passing credit.

codex57

What's the diff btw a service tech and a diagnostic specialist?