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2005 Highlander - Power window problem

7 messages,  Last post on Jun 24, 2008 at 9:19 AM

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#3 of 7 Heat/Air Control form 2005 Toyota Highlander by ewarlick1 Apr 16, 2008 (5:11 pm)
Randomly, my 2005 Toyota Highlander when the air conditioner is on will switch to heat. Anyone else had this problem and anyone with a solution? Replies to this message: LoJack (Jun 23, 2008 7:59 am) tidester (Jun 23, 2008 10:15 am) wwest (Jun 24, 2008 9:19 am)
#5 of 7 Re: Heat/Air Control form 2005 Toyota Highlander [ewarlick1] by LoJack Jun 23, 2008 (7:59 am)
Replying to: ewarlick1 (Apr 16, 2008 5:11 pm) Although I'm no expert but I had this problem for a very longtime. My friend just fixed it. He took out the panel where the radio and air sit. Unscrewed the side and opened the box where the circuit is. There is a wire that broke. You could immediately see the broken piece. He replaced the wire by saughter it back together. It works perfect! If it wasnt for him I would of had to replace the whole circuit and it would of been around $400 for the part. Good luck! Replies to this message: tidester (Jun 23, 2008 10:15 am)
#6 of 7 Re: Heat/Air Control form 2005 Toyota Highlander [LoJack] by tidester HOST Jun 23, 2008 (10:15 am)
Replying to: LoJack (Jun 23, 2008 7:59 am) It's amazing what a drop of solder can do!   tidester, host SUVs and Smart Shopper
#7 of 7 Re: Heat/Air Control form 2005 Toyota Highlander [ewarlick1] by wwest Jun 24, 2008 (9:19 am)
Replying to: ewarlick1 (Apr 16, 2008 5:11 pm) There are two sensors, primarily, that might be at fault, the OAT sensor and the IAT sensor. If either of these should go open circuit the A/C would probably switch to HEAT.   An open OAT, Outside Air Temperature sensor, would indicate to the system that it is EXTREMELY COLD outside. An open IAT, Interior Air Temperature sensor, would indicate that the cabin is TOO COLD.   A third possiblity, while less likely, occurs if the engine coolant is "threatening" to go overtemp. To protect the engine the A/C will be disabled if the coolant temperature is rising toward the "danger" level, but not necessarily "there" yet.   The OAT, generally, is mounted on the back side of the front bumper just in front of the A/C condensor/radiator stack. The IAT is behind that small vaned window above the driver's right knee. I have always relocated the OAT sensor so it isn't unduly influenced by the heat radiating from the condensor/radiator stack during cold weather.

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