Frozen Manifold Heat Control Valve

Duggie said
I soaked the bottom of the exhaust manifold, including the heat control valve for 24 hours in white vinegar. Figured there was nothing to lose while the solvent is in transit.

The valve free' d up! Rotates way past open and closes without binding. Lucky day!

Now to find a Home Depot anti rattle spring.

I always thought the spring was bi metallic and reacted to the heat of the manifold to close the damper as it got hot. I don’t know that as fact, it’s just how I thought that it worked, so I don’t think that just any spring will restore the OE action.