Quick note: I have not worked with the DC side for PID control, as I melted mine and decided it wasn't worth the effort/replacement!
AC side SSR, if used on its own, does not get hot enough to require a heat sink (tested via finger). I cannot speak to the setup if the DC is included.
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2009.5 2720SL
2006 Toyota Sienna
2018 Audi Q7
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