It can be intermittent. It can be a fluid issue or an electrical issue since the fan is electrically actuated. The fan clutch has three main elements, a fluid chamber, reservoir chamber, and clutch actuator valve/fan speed sensor. The actuator valve and speed sensor are controlled by the power-train control module.
I attached a pic below. Check to make sure the connection at the actuator is clean and tight.
Also, take a look through this link. It describes common symptoms related to a failing fan clutch.
Let me know if this helps or if you have other questions.
Tuesday, September 15th, 2020 AT 6:04 PM