Why does my radiator fan only work with AC on?
The most likely culprits are a thermostatic switch, fan resistor, temperature switch, low-speed or high-speed relay, or a wiring issue. When the vehicle has the AC on, the engine needs extra help cooling so the ECU commands the fan to be on any time the AC is on.
Should radiator fan run when AC is on?
Both radiator fans should always run when the AC compressor is engaged. 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.
Why does my radiator fan not kick on?
If the fan doesn’t come on, you need to look for a blown fuse or breaker. In older cars, you might have a fusible link – this is wire within an insulated block of rubber. Try to grab the end and stretch it. If the wire stretches, the wire link could be broken and you’ll need to replace it.
Why does the radiator fan not come on when the AC is on?
As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem.
When does the radiator fan close to ground?
This thermo-switch is set to close the circuit to ground when the coolant reaches about 200 deg.F. The secondary thermo-switch for the cooling fan is located where the upper radiator hose attaches to the engine. It does not close the circuit to ground until the coolant reaches about 225 deg. F.
Why is my AC unit buzzing but the fan is not spinning?
You go outside to check the A/C unit, and it’s buzzing but the fan’s not spinning. What’s going on? You may have a bad capacitor. The good news is, it’s pretty easy to find out. A bad capacitor is a common A/C problem with a straightforward fix. First, what’s a capacitor and what does it do?
Where is the switch for the radiator fan?
The radiator fan switch is located on the thermostat housing and if jumped should operate the fans. no, when the AC is on they both seem to work , even when the temp goes up, or if you turn off the AC , then the fan stops turning. I found underneath the Thermostat housing a single wire going into the engine block, is this the sensor switch.