I run this in my K5 and will put one in my C20.
https://www.oldairproducts.com/product/25-1018-bypass-heater-valve?srsltid=AfmBOoqHIF7WgXedrJNAlOwguFikFcyPcjRaRaWSSX-Y3mUbSZdQBMvb
It's available in push or pull cable to open. Cable is not included, but they are cheap . Engine warms up faster...