Fan not turning on

[Chamberpains]

No, normally open means that the solenoid itself is open allowing air to flow through. When you switch it on it will close cutting air off to the fan. Which engages the fan.

You can buy the exact same solenoid that's on your truck now or shop around for a cheaper one. Sometimes they come with three ports. Sometimes with two ports and one exhaust already attached. It all depends on which one you buy. The ones with three ports can usually be configured multiple ways. Normally open or normally closed.