My ac fan will not kick in....

Turn the power off at the breaker for an hour. When you turn it back on, it will reset all the functions and relays.

The spiral spinning thing is the hub of the condenser fan (normally). It alerts the service engineer that the blades are spinning. Thermocouples don't move, it is just a small rod in a flame. https://www.wika.ca/landingpage_thermocouple_en_ca.WIKA

Help and a link to the maker.

https://www.google.com/search?q=Bryant+Evolution+erratic+fan+speeds

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Check for bad ballast resistor.

The heat will normally use a low speed on the fan, & the AC along with the fan switch on the thermostat will use the high speed. The thermostat turns that high speed on when there is a call for cooling & is the same switch if you were to manually turn the fan from auto to on. Try turning the fan on @ the thermostat. If it works, then replace your thermostat. If it doesn't, it could be a bad fan speed, a bad fan relay on a control board or external relay, or a loose or broken green thermostat wire.

If there is bubbles occurring even inside the top part of the radiator (where you have the coolant put in), you may have a leak on your head gasket. You may be loosing coolant through the engine.

The cooling fan is supposed to come on when the /ac compressor clutch cycles on, and off when it cycles off.
The idle speed kicks up to compensate for the additional a/c compressor load and the additional alternator load. usually, just the low speed comes on until it hits a much higher temperature.

the system should cycle 4 to 7 times/minute at 79 degrees F.

Here are some things to consider:(The PCM (engine computer) is NEVER defective, don't replace it). I don't think it is the ECT (engine coolant temp sensor) or the Cylinder Head Temp Sensor. Or the VSS or the MAF sensors.


The electronically controlled fan clutch is controlled by the powertrain control module (PCM) based upon requests for airflow to cool the engine, transmission and A/C condenser. If no cooling is required, the electronics permit the fan to spin at a slower speed yielding improved fuel economy.
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Inoperative or damaged:

• Electronically actuated fan clutch
• Electronically actuated fan clutch controller
• Wiring, connectors, relays or modules
• Engine Coolant Temperature (ECT) sensor (4.0L SOHC)
• Cylinder Head Temperature (CHT) sensor (4.6L [3V])
• Mass Air Flow (MAF) sensor
• Vehicle Speed Sensor (VSS)
• ----------------------------------------------------------------------------

If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
Retrieve any DTC Codes (Diagnostic Test Code). Autozone will do for free.

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The cooling fan clutch actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation.

The cooling fan clutch actuator valve is activated with a pulse width modulated (PWM) output signal from the powertrain control module (PCM). By opening and closing the fluid port valve, the PCM can control the cooling fan clutch speed. The cooling fan clutch speed is measured by a Hall-effect sensor and is monitored by the PCM during closed loop operation.

The PCM optimizes fan speed based on engine coolant temperature (ECT), engine oil temperature (EOT), transmission fluid temperature (TFT), intake air temperature (IAT), or air conditioning requirements. When an increased demand for fan speed is requested for vehicle cooling, the PCM monitors the fan speed through the Hall-effect sensor. If a fan speed increase is required, the PCM outputs the PWM signal to the fluid port, providing the required fan speed increase.

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This may or may not help you.If the sound you hear is a constant whirring/grinding sound it may be the fan motor.If the fan takes a few seconds longer to speed up when you increase the speed it could still be the fan.If the sounds you hear are clicking sounds and they get quicker or slower as you play with the fan,it may well be leaves or junk in the fan housing.Its a common thing.Hope this helps you either way

No obvious reason for this behavior, so it is likely the control head is failing. You may be able to get a used one at a salvage yard.

Solid-state controls change the level of power in the fan motor to control the speed of the fan. For instance, when you switch from medium to high on a solid-state fan, the speed control mechanism increases the power of the motor. Solid-state controls are generally equipped in fans with controls that have predetermined settings, such as low, medium and high.
The solid state device in or around the fan motor could be defective and in need of replacement.
https://www.hunker.com/12003281/how-does-a-ceiling-fan-speed-control-work

ac fan fuse should be in engine comprtment in a labled box near firewall passenger side

heater controls could be gone