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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

What is this discussion about? Toyota Highlander, SUV


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#60 of 107
'04 Highlander evap core replacement by karen42
Mar 28, 2009 (6:56 pm)
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my '04 Highlander A/C started blowing warm air. A check at my repair shop showed no freon so they added some and checked for leaks. Had cool A/C about 24 hrs, then hot air again. Freon added again but no leak ever found and again had cool air for about a day. The condenser and clutch are fine so I was told the evap core is probably the problem Also, when I just have the vent control on and the temp know turned too the cool side, hot air will come out when I go around a curve or corner. Very weird. Any ideas? I was told replacing evap core was very labor intensive therefore big $$. I live in an area where I need the A/C in the warm months. Thanks for any help/suggestions.
#61 of 107
Re: '04 Highlander evap core replacement [karen42] by mikefm58
Mar 28, 2009 (7:48 pm)
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Replying to: karen42 (Mar 28, 2009 6:56 pm)

I had a wierd similar problem like you described, but I wasn't low on freon. The air temp. in my case would also go between hot and cold by itself. Grab a hold of the temp. control knob and shake it. It should be firm. If it's loose, pull it straight out and check the nut that tightens down on the bolt. Tighten it down and use some lock tite so it won't come loose again.
 
Good luck and let us know if this fixes it.
#62 of 107
Re: Recirculation stop and starts [AnthonyVWSmith] by wwest
Mar 29, 2009 (9:04 am)
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Replying to: AnthonyVWSmith (Feb 01, 2009 2:01 pm)

Many automatic systems will turn the system to fresh airflow within a few minutes if the A/C is not operating. Otherwise too much danger of moisture buildup in the cabin and the soon thereafter windshield fogging over.
#63 of 107
Re: '04 Highlander evap core replacement [mikefm58] by howza1
Apr 21, 2009 (7:16 pm)
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Replying to: mikefm58 (Mar 28, 2009 7:48 pm)

You Rock!
 
Just fixed my Highlander in two minutes by tighening the nut.
 
Car was blowing hot air even in the off position, and only hot with the AC on.
 
Now it works like new.
 
Thank You!!!!!
#64 of 107
Re: '04 Highlander evap core replacement [howza1] by mikefm58
Apr 22, 2009 (3:55 am)
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Replying to: howza1 (Apr 21, 2009 7:16 pm)

Cool, glad I could help, I've even heard from others that had taken their vehicle to their dealer and been given huge estimates to replace major components of their A/C or heater systems. I've got to believe there is a TSB from Toyota somewhere.
#65 of 107
Re: Recirculation stop and starts [wwest] by AnthonyVWSmith
Apr 25, 2009 (6:53 am)
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Replying to: wwest (Mar 29, 2009 9:04 am)

Have now resolved the issue and it turns out to be TOO MUCH freon which causes the pressure sensor to cut out. I'm guessing that the garage I used filled the freon manually and put too much in. So if you have the situation where you can get cooling when the re-circulator is switched off, but when you put on the re-circulator the A/C continally switches on and off, then check the freon levels.
#66 of 107
Re: Recirculation stop and starts [AnthonyVWSmith] by tidester HOST
Apr 25, 2009 (9:45 am)
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Replying to: AnthonyVWSmith (Apr 25, 2009 6:53 am)

it turns out to be TOO MUCH freon
 
I didn't know that was possible. Thanks for the info.
 
tidester, host
SUVs and Smart Shopper
#67 of 107
Re: Recirculation stop and starts [tidester] by wwest
Apr 26, 2009 (9:51 am)
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Replying to: tidester (Apr 25, 2009 9:45 am)

Too much refrigerant and the pressure switch that activates the compressor is always open, especially if the OAT is HIGH.
#68 of 107
Re: '04 Highlander evap core replacement [mikefm58] by janners
May 01, 2009 (10:14 am)
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Replying to: mikefm58 (Mar 28, 2009 7:48 pm)

It is definitely the nut behind the control knob. i believe htis is a fault with Highlanders. It comes loose and finally the wires break behind the knob making the heat either full on or intermitent.
I tried to solder the wires but in the end bought a replacement unit on ebay for $200. the dealer wanted $700 to do it and $565 just for the part. it is easy just pry out the facia and then undo 4 screws the whole thing pops out and then replace with new or used unit.
If you are good at soldering it could save you a lot of money. If it has only just happened you may be lucky and get away with tightening the nut behind the control knob
 
Good luck!
#69 of 107
Re: '04 Highlander evap core replacement [janners] by karen42
May 01, 2009 (3:21 pm)
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Replying to: janners (May 01, 2009 10:14 am)

I took the temp control knob off and the nut was loose just like you all said,so I tightened it. It helped with the cool/warm air blowing when I just used the vent,. but my A/C still blows warm air when I turn it on. I'm afraid I'm going to have to find a repair shop to check it out. I will not go to the dealer since I don't really trust them not to rip me off. Thanks for all the suggestions.

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