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Toyota Highlander Heating Ventilation and Air Conditioning

107 messages,  Last post on Nov 16, 2009 at 5:13 PM

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#47 of 107 by kenlw Jul 19, 2008 (4:51 pm)
Not to disagree but the heater bypass valve should already be closed (actually, in bypass mode) when the temp is on "cool" and the outlets are not on defrost.   To cool a car down quickly after sitting in the sun, 1st put down ALL the windows, switch the AC to NON-recirculate and the highest fan speed. After about 1-3 minutes of driving, roll up the windows and switch the AC to RECIRCULATE.   Why? The fastest way to move the cabin temp down from 140 is to get it to 100 by rolling down the windows. Then let the AC take it from 100, instead of trying to make it work against 140 air. Replies to this message: wwest (Jul 20, 2008 7:13 am)
#48 of 107 Re: [kenlw] by wwest Jul 20, 2008 (7:13 am)
Replying to: kenlw (Jul 19, 2008 4:51 pm) "heater bypass valve should already be closed..."'   If you mean the reheat/remix vane/door then it will only be fully closed, and REMAIN fully closed, with the system in the max cooling position. On the other hand if you mean the actual coolant flow valve then the beancounters have been successful in eliminating that feature some years ago now.   If the hot engine coolant is allowed to flow through the heater core then the radiant heating effects can be rather substantially adverse to the cooling capability of the system.
#49 of 107 Re: Intermittent A/C Problem [luckybelly] by tonney Aug 01, 2008 (5:34 pm)
Replying to: luckybelly (Jun 28, 2008 5:12 pm) My 03 Highlander has a similar problem. When either the fan/vent or A/C is on, every once in a while the heat starts blasting. Very inconvenient. Had this diagnosed today - a resistor in the circuit board behind the panel will have to be replaced...$1,100!!!!   Anything like this out there??? Replies to this message: irishcasey (Aug 01, 2008 9:05 pm) texastoolguy (Aug 15, 2008 9:19 am) bdyment (Aug 15, 2008 11:44 am)
#50 of 107 Re: Intermittent A/C Problem [tonney] by irishcasey Aug 01, 2008 (9:05 pm)
Replying to: tonney (Aug 01, 2008 5:34 pm) Yes, my 2002 V6 Highlander with manual ac/heat controls is also exhibiting this same condition. With the temp dial on blue (cold) and the fan on and the a/c on it periodically and intermitently blows warm air rather than cold air. It will do this for maybe 10 to 15 seconds and then go back to blowing cold air. So just $1,100. Are you going to get a second opinion?   Also my V6 is using excessive oil and has blue exhaust when started in the morning. My dealer insists on measuring the oil usage requiring me to take it to them periodically to measure oil. Last trip used a quart of oil in 500 miles. I'm aware of the slug settlement but my dealer pulled the head cover off and told me there was no sign of slug. It's not sounding like they want to help me.   Anyone have any suggestions, please help. thanks. Replies to this message: texastoolguy (Aug 15, 2008 9:19 am) bdyment (Aug 15, 2008 11:44 am)
#51 of 107 Re: Intermittent A/C Problem [irishcasey] by texastoolguy Aug 15, 2008 (9:19 am)
Replying to: irishcasey (Aug 01, 2008 9:05 pm) I had same problem a few weeks ago. It started about a month ago and it gets progressively worse. Toward the end. My AC was fine if ambient temp was below 80 but the hotter it got outside the hotter the air blew inside. Kind of defeats the purpose of AC. Dealer say it's a known issue but my extended coverage expited in May and it's dang hot here in TX... I paid the 1 K for the PWBA and it fixed it. Replies to this message: bdyment (Aug 15, 2008 11:44 am)
#52 of 107 Re: Intermittent A/C Problem [texastoolguy] by bdyment Aug 15, 2008 (11:44 am)
Replying to: texastoolguy (Aug 15, 2008 9:19 am) I am curious. What is PWBA?
#53 of 107 Re: Intermittent A/C Problem [luckybelly] by jtumis Aug 21, 2008 (6:09 pm)
Replying to: luckybelly (Jun 29, 2008 4:43 pm) How do we fix it? What is a pwba? Can I do this myself?   Perhaps letting Toyota know may do something?   http://toyota.custhelp.com/cgi-bin/toyota.cfg/php/enduser/ask.php?p_sid=3Yi8sVbj- &p_lva=&p_sp=&p_li=&p_accessibility=
#54 of 107 A/C problem by mikefm58 Sep 05, 2008 (4:30 pm)
04 HL, 4 cyl, 40K miles, manual temp. controls, A/C blowing air that is barely cool, compressor not cycling on, freon pressure test is good. My wife is the primary driver and describes it kind of like some of the recent posts, works intermittently. I didn't see that anyone had anything conclusive. Any ideas? Replies to this message: kenlw (Sep 05, 2008 4:45 pm) mikefm58 (Sep 05, 2008 6:51 pm)
#55 of 107 Re: A/C problem [mikefm58] by kenlw Sep 05, 2008 (4:45 pm)
Replying to: mikefm58 (Sep 05, 2008 4:30 pm) if the compressor isn't cycling on, the air won't be cool at all. And if the compressor won't come on, how do you tell if the freon pressure is good? Replies to this message: mikefm58 (Sep 05, 2008 6:51 pm)
#56 of 107 Re: A/C problem [kenlw] by mikefm58 Sep 05, 2008 (6:51 pm)
Replying to: kenlw (Sep 05, 2008 4:45 pm) You're right about the compressor cycling, I must have not heard it correctly. I did notice the temp. control knob was quite loose as others have stated. I pulled the cover off and hand tightened the nut, seems much cooler now, but it's night time, still hot here in Florida but I'll know more tomorrow when it's hot.

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