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2005 Sienna ventilation never off

10 messages,  Last post on Jan 31, 2010 at 10:51 AM

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What is this discussion about? Toyota Sienna, Heating / Cooling, Van

Messages Page 2 of 2

#7 of 10 Re: 2005 Sienna ventilation never off [wwest] by typesix

Jan 29, 2010 (10:06 am)

Replying to: wwest (Jan 28, 2010 11:52 am)
Well, obviously, you haven't driven any recent American cars then. My ex-boss' Dodge Intrepid and Stratus both would shutoff the outside air damper when the fan was off. Both had manual systems.

#8 of 10 Re: 2005 Sienna ventilation never off [typesix] by wwest

Jan 31, 2010 (9:02 am)

Replying to: typesix (Jan 29, 2010 10:06 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.
 
And...
 
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] by typesix

Jan 31, 2010 (10:40 am)

Replying to: wwest (Jan 31, 2010 9:02 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] by wwest

Jan 31, 2010 (10:51 am)

Replying to: typesix (Jan 31, 2010 10:40 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.

Messages Page 2 of 2

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