Knobs for AC/Heater fan, defrost not working

2012 TOYOTA 4RUNNER
80,000 MILES • 4 CYL • 2WD • AUTOMATIC
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RICK SELL
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My AC comes on and blows air, and the fan comes on at max. When I turn knob to lower fan, nothing happens. When I change temperture to higher or lower then the fan speed changes itself then sometimes I can turn the fan knob up or down.
May 28, 2017 at 11:42 AM
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HMAC300
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if this is auto temperature control a mechanic needs to scan for codes to find the problem. kind of sounds like it is.
May 29, 2017 at 6:19 AM
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RICK SELL
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Thanks for reply. I did a scan and came up with the following error codes: P0442 - Evaporated emissions system leak detected (small leak) and P1135 - Air-Fuel sensor heater circuit response malfunction.
May 31, 2017 at 8:38 AM
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HMAC300
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  • 48,601 POSTS
you have to h ave a mechanic scan this those are engine codes not hvac. auto parts scanners cannot pickup the codes that are effecting your heater.
May 31, 2017 at 9:25 AM