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Toyota Avalon Climate Control Questions

193 messages,  Last post on Oct 08, 2009 at 5:22 PM

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What is this discussion about? Toyota Avalon, Heating / Cooling, Sedan

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#184 of 193 Re: 07 Avalon Touring White Powder from AC Vents [bhawks] by amauhry Jan 08, 2009 (7:42 am)
Replying to: bhawks (Oct 30, 2008 4:11 pm) If they were messing with your dash, then they weren’t changing the condenser. Condenser location is next to the radiator in the engine compartment. Evaporator location, however, is by the dashboard.   The evaporator is just a whole bunch of copper tubing and aluminum fins held in place by solder (simplified explanation). Then you have the refrigerant (R134a) flowing inside the tubing. Nothing in there is supposed to release any powdery substance unless the copper tubing and/or fins were dirty/contaminated in their exterior surfaces when Toyota assembled the car.   Or it could be that the ductwork material was internally contaminated/dirty at the time of assembly. The refrigerant is out of the question; when it leaks, the refrigerant does not leave powdery stuff.   Last but not least: the heater core. Air first blows through the evap then through the heater core. Any contamination in the exterior of the heater core could be a valid reason for this problem too.   Amaury ’08 Limited Replies to this message: wwest (Jan 08, 2009 10:14 am)
#185 of 193 Re: 07 Avalon Touring White Powder from AC Vents [amauhry] by wwest Jan 08, 2009 (10:14 am)
Replying to: amauhry (Jan 08, 2009 7:42 am) Back in the early ninties Lexus "experimented" with the use of a porus coating on the evaporator vane surface area into which, into the pores, was embedded an anti-microbial chemical. The rumor is that this early practice was discontinued once it was realized that no MSDS from had been filed with the US.   This was to combat the growth of microbes which constitute the mould and mildew odor, "dirty gym sock odor" many of us are now so very familiar with.   This lead to many problems and the practice was discontinued until it could be "perfected".   "perfected"   NOT...   The source of the "dust"....   The embedded chemical has long since been washed away by daily A/C activity (takes as little as 6 months) and now the porus coating is breaking down due to those day to day "washings". You will in all probability be getting a new A/C evaporator absent the porus coating.   Another experiment that didn't work.   My understanding is that the new LS's have a UV light source mounted near the A/C evaporator to help combat this problem.
#186 of 193 A different heat problem with Avalon by BobWS Feb 07, 2009 (2:41 pm)
I am,according to the folks at Toyota,the only person in the universe with this problem. We bought a brand new 2007 Avalon Limited in May 2007. From the 1st time using heat the car will on occasion kick the heat to maximum Then we have to hit the buttons to bring back to normal. It has done it several times on say a trip from Buffalo to Syracuse-then it will go weeks and weeks and not do it   Of course it never acts up for the dealer!! The arrows indicating where the heat is going will change by themselves and then last week the radio came on by itself! ( This week the windshield washer bottle emptied out because the bottom hose fell off. Dealer fixed that)   Anyone experience any of these? Otherwise the car is great actually.
#187 of 193 by mitch1947 Feb 07, 2009 (6:42 pm)
I believe it's normal for the arrows to switch automatically from the floor and dash vents depending on the temperature required. I also had the same problem with the windshield washer bottle and there is a TSB (TSB BO 008-07) for the 2007 Avalon and it involves replacing a hose, joint and related washers. I haven't had the mystery radio come on by itself. If you have the heat set to automatic the fan will increase in volume as the car warms up but it should automatically decrease when the desired temperature is reached. I did have one weird problem - the heated seats stayed on even when the switch was in the off position and of course it couldn't be duplicated at the dealership. It only did it one day and it's been fine ever since. I hope they find out what's causing your problems.
#188 of 193 98 avalon xls blower runs on low by ronwuzhere2 Jun 21, 2009 (8:31 pm)
my avalon recently started running on low even when i switch it manually to high. sometimes it will go to normal speed then to low and repeats. no pattern to it just random. checked the blower and it's fine. i've read that the xls does not have a resistor but then i have no idea what would cause this. any ideas would be greatly apprecciated.
#189 of 193 1995 Avalon Cabin Filter? by gregoryd73 Jun 28, 2009 (8:16 am)
Anyone know if the '95 Avalon XLS has a cabin filter behind the glove box, like later models? Replies to this message: Mr_Shiftright (Jun 28, 2009 1:14 pm)
#190 of 193 Re: 1995 Avalon Cabin Filter? [gregoryd73] by Mr_Shiftright HOST Jun 28, 2009 (1:14 pm)
Replying to: gregoryd73 (Jun 28, 2009 8:16 am) Not it doesn't. That's comes in about 1999 on the Avalon I think.
#191 of 193 AC Blowing Hot air by wilsongk1 Aug 07, 2009 (7:21 pm)
A/C blowing hot air. Going to take it to an independent shop, but wanted to see if there are any issues that might cause this besides needing a new compressor. Any Ideas??   Thanks KW
#192 of 193 Heater problems by jeal1 Oct 08, 2009 (4:09 pm)
I posted this question in the 2008 Toyota Avalon section and then came upon this forum. So, here it is again. When I set my Avalon's passenger temperature to anywhere between 74 and 80, the back vents blow out air at 107 degrees which makes it impossibly hot for anyone in the back seat. The passenger in the front has to freeze or the back seat passengers have to burn up. Anyone else having this problem? Replies to this message: tjc78 (Oct 08, 2009 5:22 pm)
#193 of 193 Re: Heater problems [jeal1] by tjc78 Oct 08, 2009 (5:22 pm)
Replying to: jeal1 (Oct 08, 2009 4:09 pm) I don't think its a problem at all. From what I remember from when I had my '06 Avalon that is just the way it works. FWIW I never had to set the heat above 68-69 or the car blew me out of there it was so hot.

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