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I would imagine there should be a spot to use a Allen wrench somewhere along the circumference of the handle, the whole piece that moves when you select desired temperature. If not my other suggestion would be possibly behind the white cap there may be a nut or screw to loosen and remove.
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2018 3920fb 2020 GMC Denali 3500 4x4 Duramax, 10 speed Allison. LB SRW, Firestone air bags with Airlift wireless onboard compressor. Anderson Ultimate Hitch. MX4 folding cover. 50gal titan in bed transfer tank. Onan 6500 lp genset installed by me ! Had: 2 HF 3500 Inverters with Parallel Kit
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