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Ac switch not working

Discussion in '4th Gen 4Runners (2003-2009)' started by captdon, Jul 10, 2025.

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Jul 10, 2025 at 9:00 AM

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captdon [OP] New Member

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05 4 runner ac won’t turn off with switch

captdon, Jul 10, 2025

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Jul 16, 2025 at 8:33 AM

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RyHops124 New Member

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Silver 2007 T4R Sport 2WD V6 // Eibach Stage 1 // JBA Std UCAs // Kingsport Grey 18" T4R Limited Wheels bear hugged by Firestone Destination At2s 275/65/18

Eibach Stage 1 // JBA Std UCAs // Kingsport Grey 18" T4R Limited Wheels bear hugged by Firestone Destination At2s 275/65/18

Please describe additional symptoms. Sounds like the AC is on but it won't turn off? Are the controls lit up? What is the display unit showing above your AC; outside temp, miles remaining, etc.?

I just recently replaced my HVAC ECU behind the control unit. Display was functioning but only the clock was working. The AC controls would not light up, nor would the buttons turn the system on. Found a used ECU unit on eBay, swatched it out, and works good as new.

Not sure if you're having the same issues but changing out the AC ECU worked in my case.

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RyHops124, Jul 16, 2025 at 8:33 AM

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