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Toyota Highlander Heating Ventilation and Air Conditioning

97 messages,  Last post on Oct 26, 2009 at 2:27 PM

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#74 of 97 Problem with air temp changing by rut Jun 03, 2009 (3:12 am)
In my 2002 highlander the air temp will vary with the slightest of bumps. It will jump from hot to cold immediately.    The dealership wants $800 to replace the panel:( I'm thinking it is a loose wire or something.    Anyone else seen this problem?    Rut Replies to this message: mikefm58 (Jun 03, 2009 5:19 am) wwest (Jun 03, 2009 11:44 am)
#75 of 97 Re: Problem with air temp changing [rut] by mikefm58 Jun 03, 2009 (5:19 am)
Replying to: rut (Jun 03, 2009 3:12 am) Start reading posts backwards. Your answer is in there.
#76 of 97 Re: Problem with air temp changing [rut] by wwest Jun 03, 2009 (11:44 am)
Replying to: rut (Jun 03, 2009 3:12 am) "...slightest of bumps.."   Most likely a loose/intermittent connection to the OAT, Outside Air Temperature, sensor mounted behind or on the back of the front bumper just forward of the AC condensor/radiator stack.   And open connection will indicate a sub-freezing OAT and the AC compressor will be disabled and the system will go into heating mode as long as the sensor is open.   Another "bump", connection closes, AC cooling returns.
#77 of 97 '01 Highlander Aircond problem by slowcar Jul 20, 2009 (1:35 pm)
Problem description: in a hot day, the aircond only blows out cold air in the passenger side vents, warm air still in the driver side vents. The aircond was put in the recirculation mode; never have from the outside. My thought was that there was some thing (a valve, maybe?) blocking the cold air from going to driver side.   What's wrong?   Solutions?   Thanks all for help. Replies to this message: Alirob (Aug 07, 2009 1:38 pm) slowcar (Aug 25, 2009 12:26 pm) rohoo (Aug 28, 2009 5:29 am) slowcar (Oct 08, 2009 9:23 am) wwest (Oct 08, 2009 12:14 pm)
#79 of 97 A/C Problems by leean21 Jul 20, 2009 (3:20 pm)
ok, let me try this again, without hitting the enter button before i put a message....anyways, I just recently started having the problem of hot air blowing through while my ac is on, then switching back to cold air....i have tightened the nut behind the temp switch and am hoping that is the fix....thanks so much for all the information...you guys are awesome   Replies to this message: rut (Jul 20, 2009 4:26 pm)
#80 of 97 Re: A/C Problems [leean21] by rut Jul 20, 2009 (4:26 pm)
Replying to: leean21 (Jul 20, 2009 3:20 pm) I actually took it apart and found a broken wire connecting the temp knob to the ckt board. It was a 3 wire cable soldered on each end. I removed the cable and replaced it with 3 individual wires. Problem solved.
#81 of 97 Re: Highllander AC/heat control problem [ladyk1] by jorge6088 Aug 02, 2009 (1:51 pm)
Replying to: ladyk1 (Mar 17, 2008 5:05 pm) I have same problem and tightened the knob. This has reduce problems but once in a while still get switch from cool to heat. How do I fix the broken cables? are there any specific instructions on how to do this?
#82 of 97 Re: a good way to thank you for helping me [kburger1] by jorge6088 Aug 02, 2009 (1:58 pm)
Replying to: kburger1 (May 27, 2009 10:14 pm) I have same problem and tightening knot did not fix it. I like to try to solder wires. Could you please send me more specific instructions on how to remove ac unit? thanks.
#83 of 97 circuit board removal by rut Aug 02, 2009 (5:42 pm)
You have to remove the complete unit out. it just kinda snaps out if I remember correctly. there is a circuit board that you have to remove. There are a few screws holding it in. Be careful handling the board as to not emit any static electricity that would take out the ic's on the board.   You will find a small circuit board mounted where the temp control is. Go assuming you have taken the knobs off in front and removed the nuts on the controls, you can unclip the board and pull it out. There is a 3 wire cable connecting the circuit board to the temp switch. Mine had a broken wire at the small board. Be very careful trying to solder this back. It requires a small tip and not too much heat.   Hope this helps. Better than spending $800 for a new one or $300 for a used one.   Rut Replies to this message: davidc4607 (Oct 18, 2009 3:21 pm) davidc4607 (Oct 26, 2009 2:27 pm)

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