My '11 Ranger 800 crew overheats. Fan start waits til temperature reaches 215, and cuts off at 205. Why?

https://www.rangerforums.net/threads/2012-ranger-800-problem-after-problem.9089/

Check out this forum. This may be your problem.

does the fan come on? possible wiring or temp sensor

You say that the temp switch is good but are you refering to the temperature sender unit for the temperature gauge or the sensor switch ( 2 wires ) that communicates to the ECM to turn on the fan when the coolant temperature reaches a pre determined point. Find it and replace it

please follow this steps and fix it.
A fan failure, or a failure of the fan relay or control circuit is bad news because it can allow the engine to overheat.
Five things may prevent an electric cooling fan from coming on:

• Defective temperature switch or coolant sensor
Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan)
• Failed fan relay
• A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)
• Bad fan motor

ELECTRIC COOLING FAN QUICK CHECKS.
One way to quick check the fan circuit is to start the engine and turn on the A/C to max. If the fan runs, the fan motor, relay, fuse and wiring are all okay. But this test doesn't show if the temperature switch or temperature sensor and PCM are energizing the fan when coolant temperatures are high.
To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective. Resistance checks should then be made on the temperature sensor or switch, and a voltage check on both sides of the relay (you will probably need a wiring diagram of the fan cooling circuit on your vehicle to identify the relay terminals and wiring connections).
The fan motor itself can be checked by using jumper wires. Unplug the wiring connector on the fan, and use the jumper wires from the battery to route power directly to the fan. If the fan motor is good, the fan should spin at normal speed when supplied with 12 volts. Noisy bearings or a slower than normal speed would indicate a worn motor.

Is the engine actually cooling off? If the temp switch isn't seeing a drop in temperature, it will keep the fan running.

The cooling fan is made to come on when the engine reaches a certain temperature. To give a simple and general test - turn the AC on high - it your AC and fan are both working correctly the fan should come on almost immediately. If not within very few minutes like 5 or 8.
Also at operating temperature the fan will run as well. In the early morning before you start the car open the hood - fill the radiator while the engine is still cold. start the engine and wait about 10 minutes or so. The fan should come on before the engine over heats. This may take up to 20 minutes and the fan is designed to run after the car is shut off IF - the temperature is hot enough.

open the hood, start the car and wait til it comes to normal temp. wait and see if the fan/s kick in. If they don't then there is a problem with the fan circuit or you have a bad fan. Turn on the a/c and see if the fan instantly turns on. if the fan does't turn on, then the fan may be faulty.

will try to help. the fan you replaced, was it the air conditioner fan? if so. then you need to check your primary fan. the one that does come on when the engine reaches operating temperature. make sure by starting engine, let the motor run and the temperature guage reaches the normal operating temperature.if the main engine cooling fan does'nt come on, then you'll need to check the fuse box under the hood. relays are black square plug in's they are marked and will[fan relays] tick when you turn the key on] if main engine fan does not come on when engine overheats, #1 fuse blown #2 relay bad #3 main cooling engine fan bad. note; the air conditioning fan will come on with engine running,when air conditioniing is turned on. when the a/c is turned off, the a/c fan will not be turning. hope this helps and as always, thank you for choosing fixya.com

Thermostat and Coolant Temp Sensor is What I Recomend Replacing on this Vehicle

fan does not generally come on till you reach about 210f. second fay comes on when ac compressor is on. Allowing for gauge inaccuracy this does not sound like a problem. Have you checked for coolant loss inside or outside the engine? If coolant is low, it may not be reaching the sensor unless you make pump run faster. Those engines are known for head and intake gasket problems, which may be the underlying cause of what you described. A partilally obstructed radiator can give some of the symptoms but I don't thind that is it.