Jeeper  Adventures Under the Hood  Jeeper

Coolant Temperature Override Valve (CTO)

The CTO is a thermal vacuum valve and is located in the side of the intake manifold just forward of the carburetor. It blocks vacuum to the EGR Valve and the Evaporation Canister when the engine is cold. It begins to open at a nominal 115 F.
Coolant Temp Override Valve

These drawings illustrate hose routing for the factory CTO. Note that one of the nipples is plugged. Drawing

More EGR stuff

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