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Message: <blockquote data-quote="toyman" data-source="post: 1208464" data-attributes="member: 10841">Let's clarify a few things. There is only one fan but it has a 2 speed motor (low and high). The CCRM has 4 relays, low and high fans, fuel pump and ECU power. The factory ECT setting for the low fan is 208* - 220* depending on the source reference. The Ford service manual says 220*. High fan on with the A/C on, the vehicle speed under 47 mph and engine temp above 230*. An intermittent issue is most likely a loose or bad connection. In this case I would check the ECT sensor connection. The ECT is above the T-stat in the heater bypass hose. A hard upper rad hose means the T-stat is open. A 180* temp T-stat only allows the water to start to circulate earlier than a 195* one. The T-stat only establishes a minimum operating temperature. Learn to pull codes or buy a reader like <a href="http://www.summitracing.com/int/parts/equ-3145/overview/" target="_blank"> this </a> for $22 with a digital code display. You really need to know what events the ECU has logged before spending $$'s on parts based on best guesses.</blockquote>