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The temperature at which the actuator opens to direct air to the fan clutch varies with how far the probe end is screwed into the body of the actuator. Screwing it in or tightening it causes a lower activation temperature. When taking it apart to change O rings count the turns required to get...

Strouty I have the same problem with another truck I have and it appears to me that the large O ring is the problem. I'm pretty sure it is an O ring it just tends to get deformed and flattened. I tried a loose fitting large O ring and got the problem you are having. (Fan on, actuator venting...

No secret. I just put it in a vise and used a small pipe wrench to unscrew the cap. You will then see a small tube that you grab onto and withdraw. This is the plunger or moving part of the valve. Be careful removing it. I put new O rings on mine and it works fine. However if the...

Sorry it's not the manufacturer but a retailer. Anyway price is lowest I could find

Here is the website I found. Not sure if it's actually in stock. https://comfortairgr.com/shop/fan-clutch-and-shutter-control-actuator-200-degrees-ca200011-evans-tempcon-nsn-2930-01-285-5027-12363321-012855027/ Price is $205

I have an A2 truck but the pictures you posted look the same. You can buy the actuator directly from the manufacturer. I think they are used on a lot of stuff. However I rebuilt mine with new O rings from a harbor freight O ring kit and it works fine. Just unscrew the back of it and gently...