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Old 01-27-2019, 07:28 PM #1
4RunnerFJ 4RunnerFJ is offline
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Cabin Temperature Control Question

UPDATE 2/19/19: I installed a new cabin temperature sensor and there was no change. My next option is to take it to the stealership and ask them to take a look at it. My gut is telling me it's in the controller but I'm holding out for a loose wire somewhere. Fortunately, it hasn't been that cold around here since my initial post and it continues to look like nice weather for the time being so there's no need for an in between setting of Lo or blazing hot.

My 2004 4R is an SR5 V6 with a single zone climate control. I recently swapped out all three air servo motors (blend door, air-mix, and air recirc). They failed one at a time over the course of about 6 months. It was frustrating, but I digress.

The last one to be replaced was the air mix servo. I have full heat now but the air temperature "jumps" from Lo to hot when adjusting the temperature just a few degrees. Watching the servo, the air-mix door travels a short distance each degree from Lo until it gets to 70 or 71 and then it seems to travel all the way as if I had put the temperature on HI. And the temperature is blazing hot, too. Running the temperature all the way to Hi, the door does not move any further and the temperature remains blazing hot. On the way back down, the door doesn't travel until I reach 70 or 71. At that point, it behaves the same way as it did when increasing the temperature, traveling a short distance with each decrease of 1 degree.

I don't see anything obvious I could repair to correct this issue. Could this be something with the computer since I had to disconnect several connections, like maybe it "forgot" how to respond? Anybody else experience this before?

Hopefully I explained this well for others to understand. Thanks for any help!

Last edited by 4RunnerFJ; 02-19-2019 at 09:00 PM. Reason: Update to progress
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Old 01-27-2019, 07:58 PM #2
4RunnerMexico 4RunnerMexico is offline
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I have the same issue..

Following for possible solution

Edit: Ive thought either the control panel might be bad or it might have something to do with the cabin temp sensor. I know the cabin temp sensor is located in the little vent thing below the ignition. Just haven't bothered to do any fixing....

Last edited by 4RunnerMexico; 01-27-2019 at 08:04 PM.
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Old 01-27-2019, 09:28 PM #3
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Ive had the same issue on two of my 4runners - 03 and 08. could never figure it out. Went from low temp to 65 and it would get really hot really quick
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Old 01-27-2019, 09:30 PM #4
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Quote:
Originally Posted by 4RunnerMexico View Post
I have the same issue..

Following for possible solution

Edit: Ive thought either the control panel might be bad or it might have something to do with the cabin temp sensor. I know the cabin temp sensor is located in the little vent thing below the ignition. Just haven't bothered to do any fixing....
I'm going to check my cabin temp sensor sometime over the next week, I hope. I *thought* I had looked at it a while back when I was in there for something else and everything was connected. We'll see. I will update after I look.

I refined my search after my post and found others had the same issue I have and the cabin temp sensor was the culprit.
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Old 02-19-2019, 08:59 PM #5
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UPDATE: I installed a new cabin temperature sensor and there was no change. My next option is to take it to the stealership and ask them to take a look at it. My gut is telling me it's in the controller but I'm holding out for a loose wire somewhere. Fortunately, it hasn't been that cold around here since my initial post and it continues to look like nice weather for the time being so there's no need for an in between setting of Lo or blazing hot.
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Old 02-20-2019, 01:45 AM #6
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This is going to sound really simplistic and probably not the answer for those who have replaced/tested their sensor...

The sensor lives behind a small vent (the size of a dime) just forward of the driver's right knee. Every so often I rub my finger across that vent and wipe off a ball of dust and suddenly my climate control is much more accurate.

There is the slightest amount of suction coming through there to read the temperature, and it's enough to make a dustbunny which blocks the airflow to the sensor and gives a false reading!

Not enough for anything extreme, but enough to make you say "is it REALLY 73 in here?"
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