Driver's Side HVAC Mix/Blend Door Actuator Replacement - SB9T.com
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Old 04-14-2019, 04:22 PM   #1 (permalink)
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Default Driver's Side HVAC Mix/Blend Door Actuator Replacement

Does anyone know what the easiest way to get at the driver's side HVAC mix actuator? Mine isn't working correctly, the driver's side often blows much warmer air than the passenger's and if I listen closely when adjusting temp I can hear a clicking.

Anyways, pulled off the panel below the steering wheel along with a couple of the kick panels to the right and couldn't even see it. Looking at the service manual (which isn't much help), it looks like it's way up in there, and almost looks like I need to pull significant pieces of the dash away in order to access it.

See attachments, I'm pretty sure the wire loom in white behind the plastic there is the harness for it.
Attached Images
File Type: png ac mix door.png (171.2 KB, 7 views)
File Type: png ac mix door 2.png (1.81 MB, 8 views)
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Old 04-15-2019, 07:17 AM   #2 (permalink)
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Did you already run the self-diagnostic sequence for HVAC controls?
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Old 04-15-2019, 09:02 AM   #3 (permalink)
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No I did not, is there a forum post or something on how to do that?

FYI, I took another look and was able to see the actuator, I just needed to only remove the panel right above the pedals not all the other stuff. To me it looks like the actuator only changes position like 3 times throughout the whole range of temperatures, and when in the coldest setting, it looked like it wasn't moving all the way to the end of the circular track groove
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Old 04-15-2019, 09:47 AM   #4 (permalink)
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I found the procedure, you basically hold down Recirculate and Auto when starting the car, then the panel will blink all LEDs 4 times and then any error code will come back. If it's 20, it means everything is normal. I got a 20 back, so no issues detected.
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Old 04-15-2019, 10:13 AM   #5 (permalink)
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Here's the procedure, to make sure it's not something else.
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File Type: pdf Diagnostic Chart for Self-Diagnosis.pdf (70.1 KB, 3 views)
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Old 04-15-2019, 10:22 AM   #6 (permalink)
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Thanks, yep, that's the exact one I have, code 20 blinking is what I get.
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Old 04-15-2019, 02:26 PM   #7 (permalink)
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So I pulled the actuator off and manually pushed the blend door all the way to cold. Same results, diver side is significantly warmer than passenger, I measured the temp and it's about a 15 degree difference at times. I have noticed occasional blasts of much colder air that appear to happen intermittently though I didn't observe this on the passenger side.

So thoughts? Is this like a bad seal on the door or something? That would suck, as it would involve removing the dash and replacing that whole ventilation piece to fix.
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Old 04-20-2019, 04:43 AM   #8 (permalink)
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So I think this is just a case of poor AC performance and the passenger side just gets colder probably because of where the evaporator is or something. I rented some manifold gauges and found that the system is lower then normal so I must have a small leak somewhere.
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