Last post on Jan 31, 2010 at 9:51 AM
You are in the Toyota Sienna
What is this discussion about?
Toyota Sienna, Heating / Cooling, Van
#8 of 10 Re: 2005 Sienna ventilation never off [typesix]
Jan 31, 2010 (8:02 am)
Sorry, that just isn't believable these days when as a safety measure systems will not remain in recirculate mode with the A/C off.
A manual HVAC that has a servomotor that automatically closes the fresh air inflow path when the blower is turned off.
"Does NOT compute..!!""
"..would shutoff the outside air damper.."
The MANUAL system outside air damper, typically, has two positions, FRESH and RECIRCULATE. It might automatically move from recirculate to fresh if the blower is turned off, and more likely so, MUCH more likely so if the A/C is turned off. But it would be patently UNSAFE for it to completely close off the incoming fresh air flow.
#9 of 10 Re: 2005 Sienna ventilation never off [wwest]
Jan 31, 2010 (9:40 am)
Yes, meant to say damper goes to recirc when fan is off, rest remains, believe what you want to believe, as always. Cars are not airtight as most people think.
#10 of 10 Re: 2005 Sienna ventilation never off [typesix]
Jan 31, 2010 (9:51 am)
".. damper goes to recirc.."
I would more readily believe "..damper goes to fresh..".
Cars do not need to be very airtight for rising cabin humidity to be a problem during coolish or cold climate(***) operations. So the default damper position should ALWAYS be FRESH.
*** Climatic periods, basically, when the only usefulness for the A/C is for dehumification.