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Part Number for Climate Control Panel


Dewi Daniels
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Yesterday, I took my IQ into my local Toyota dealer because the climate control isn't cooling. They've followed the Toyota diagnostics. The A/C checks out OK and they say the problem is either the control panel or the A/C amplifier. Toyota recommend replacing the control panel first. They say I need a replacement switch/control panel at £833.70. They suggested I find a second-hand one, which they could then fit for me.

The part number they gave me is T55900-74020-B0. There are several Toyota IQ control panels listed on eBay for between £27.29 and £110, but they all have the part number 55900-74010. There are a number of control panels with the part number 55900-74020-B0 listed from international eBay sellers for between £348.11 and £596.14, but the photographs included with the listings clearly show a sticker with the part number 55900-74010. My Toyota dealer claims that 55900-74010 isn't a valid part number.

What's the difference between part number 55900-74010 and 55900-74020-B0?

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I would take it to an independent garage and ask them to check the air-con pressure and check the compressor clutch is engaging and dis-engaging as it should. 

It is extremely unlikely the controls would fail as they are an all in one circuit board and I assume the rest of the panel and switches are working as they should? As it's a 9 year old car now there is a very good chance the air-con gas charge is past it's best and probably low on pressure.

Craig.

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The Toyota dealer say they've regassed to the correct gas level and tested, and that the a/c system can be made to function when bypassing the controls, which is why they think the problem is on the control side.

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If you lived closer to me I'd suggest swapping our panels over and trying them in either car. Maybe there is a local owner that would oblige?

Craig.

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