[john walker's workshop]

it's attached to the front center of the lower, main intake manifold. (front being to the front of the car). pretty much directly under the fuel distributor. pull the air filter and then it can be seen with a mirror and flashlight. there's a blue plug going to it. the thermal switch that allows it to work is on the face of the left chain housing cover. the switch is hard to get at, and you can barely see it, and often one of the 2 wires has come off, which renders the cold start valve inoperable.