2018 when i ask if the RL changes fan speed. Since my car has 201k miles its time to change again the radiator thermostat and coolant. Since i was planning to do this and bugs me why my fan never goes on high speed i said what the heck and ordered a used radiator fan control (rfc) and replaced also the coolant temp sensor. I just installed them and first time i see my fan run high. It seems my rl when my AC is on and outside temp was high, i can hear the fan changes from low, medium to high. Mostly its on medium with 92 outside temp, i also rev the engine and goes to high after. My issue was solved.

 

post the part numbers for these items if you have the box.

 

Below are the parts i used, all are oem. The RFC i bought it used at ebay but the other two parts thermostat and sensor are bought online at acura parts website.

Rfc Unit (Denso) - Acura (19090-RKB-003)

Thermostat Assembly (Nippon Thermostat) - Acura (19301-P8E-A10)

Sensor Assembly, Water Temperature (Keihin) - Acura (37870-PNA-003) = 2 PCS