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SUVs Toyota Highlander Toyota Highlander Heating Ventilation and Air Conditioning
107 messages, Last post on Nov 16, 2009 at 5:13 PM
You are in the Toyota Highlander Forum. Your Hosts are steve_ & tidester
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Replying to: slowcar (Oct 14, 2009 10:52 am) All I know, or think I know, is that the temperature of the evaporator vane surface area is not easily moderated. So we get downstream "moderation" via the remix/reheat vane/door setting. 2. These days, even if you did not purchase a climate control with the L/R different temperature settings the "core" system may still have that capability for purposes of parts commonalty. Then the question becomes is the function being used..? It would make sense to if the radiation sensor indicates the solar radiation heating effects are primarily on the passenger's side then more cooling would/might be routed to that side. A L/R system malfunction is also a possibility. To extend FE I often run my climate control systems on MAX COOLING and recirculate. Then I use the blower speed to regulate the overall cabin temperature. If that still results in too much cooling to my face and upper body I set the outlet airflow to dash/footwell combined or footwell only. That being said.... Climate control systems designed by Denso US, NipponDenso, have shown an unusual propensity for sudden spontaneous fogging of the interior surface of the windshield. So running the driver's side outlet airflow a bit higher than the passenger side might well be something of a corrective measure to help alleviate these instances. |
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Replying to: davidc4607 (Oct 18, 2009 3:21 pm) |
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Probably a straight forward one for you all. I have a 2009 HH - I doubt that it being a hybrid affects this issue. I have the manual heating and air configuration. It's annoying that even with the fan turned to the off position and cabin recirc disabled, I get some mixed air out of where ever the selection knob is pointed. Of course, you can get no air flow in the recirc mode but when the humidity gets high enough in the cabin it automatically goes back to outside air and the air starts coming through again. Is it designed like this - outside mixed air when not in recirc- or is mine broken with a vane that's not closing all the way? We never noticed this in our test drives because it was august and 100f and the A/C was on continuously
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Replying to: bobinco (Nov 15, 2009 3:31 pm)
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Replying to: wwest (Nov 15, 2009 4:31 pm)
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Replying to: bobinco (Nov 15, 2009 7:03 pm) During the winter months the incoming fresh airflow will typically have a lower Rh than the cabin atmosphere. Have you tried routing the incoming airflow to the footwell. Also, during automatic operation the footwell airflow is often as much as 20F warmer than the airflow you get from the dash outlets. Oh, and you can, and should, manually close the leftmost and rightmost dash airflow outlets.
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Replying to: wwest (Nov 15, 2009 9:46 pm) Aren't those the ones that are intended to remove moisture from the side windows? tidester, host SUVs and Smart Shopper
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Replying to: tidester (Nov 15, 2009 10:59 pm) Besides which, I have NEVER expereinced the front side windows being a problem. IMMHO it is ALWAYS the windshield that initially fogs over, begin sto fog over. The airflow from any dash outlets can be discomforting during cool or cold weatehr operation so I always try to remember to close these during the wintertime.
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Replying to: wwest (Nov 16, 2009 9:44 am) My side windows invariably become a problem when fogging occurs. Fortunately, I live in a dry climate so it doesn't happen very often. tidester, host SUVs and Smart Shopper
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Replying to: tidester (Nov 16, 2009 10:08 am) If not then the airflow from the side vents themselves may be the problem, carrying moist airflow due to the A/C being cycled off as a result of declining OAT or even "exiting" the defrost/defog/demist mode with the A/C otherwise disabled. Any time the A/C cycles off there will always be a substantial level of condensate remaining on the ~10,000 square inches of evaporator vane surface area. The only place for that to "go" is to (slowly..?) evaporate into the passenger cabin. Might even be, often is, the next morning before you see the results of yesterday's A/C operation.
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