|
Fluid should circulate through there, if fluid doesn't come out you can't tell whether the air is coming out. That valve sits right on top of the water inlet, it's the part you take off to reach the thermostat. I suggest you take the water inlet off, detach it from the water inlet hose, back the plastic bleed screw all the way out, and soak the sucker in CLR or some other rust-removing product. I'd clean out the thermostat housing as well, it's probably pretty cruddy. Just take care not to scratch the mating surfaces, you don't want it to leak when you put it back together.
The thermostat itself is probably also crudded up, but I would not clean it with any product other than water, don't know what would happen to it. BGB describes testing the thermostat, just pitch the thermostat into a pan of water along with a thermometer, heat the water on the stove and note what temp the thermometer says when the thermostat opens. It's supposed to open between 176 and 183, and open by 8mm by 203 degrees. If you decide to replace the thermostat, most guys on here recommend the genuine Toyota part.
|