Quote:
Originally Posted by Mike80D
I have one on my 72 with AC, but mine is for anti-dieseling I’ve always thought.
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It's dual purpose. It allows lower curb idle and It also serves EVAP to remove vapors from the canister. The chassis service manual has a lengthy description of operation but the schematic leaves a lot to be desired. It's funny that this item came up because yesterday mine has been stuck on. I'm thinking the temperature switch failed. I just electrically disconnected it for now.