Use a test light. You should have power coming in on a larger wire pretty much all the time. You have a signal wire that is only hot when the fan is needed. Turn the ac on. the fan should run anytime it's turned on. if that works, your relay works. As always, check the fuses.
on a 1999 jeep grand cherokee where is the coolant fan relay
To test the coolant fan on a Citroën Picasso, start the engine and let it reach operating temperature. Once the engine is warm, turn on the air conditioning; this should trigger the fan to activate. If the fan does not turn on, check the fuse and relay related to the cooling fan. If those are functioning, the fan motor itself may need to be tested or replaced.
The engine computer uses the signal from the coolant temperature sensor to decide when to activate the radiator fan relay.
change the coolant fan relay
The coolant fan relay on a 1988 Chevy Celebrity with 2.8L V6 is on the radiator support bracket behind the right hand headlights.
In the vicinity of the passenger headlight.
The radiator coolant fan on a 2000 Pontiac Montana may not work due to several reasons, including a blown fuse, a faulty fan relay, a malfunctioning temperature sensor, or a defective fan motor itself. You can test the fan by connecting it directly to a power source to see if it operates; if it does, the issue may lie in the electrical components like the relay or sensor. Always ensure to check the vehicle’s wiring and fuses as part of your troubleshooting. If the fan doesn’t work when directly powered, it likely needs replacement.
The coolant fan relay on a 1995 Acura Legend is typically located in the under-hood fuse/relay box. This box is situated near the battery, on the driver's side of the engine compartment. The relay can usually be identified by referring to the diagram on the inside of the fuse box cover, which indicates the specific position for the coolant fan relay. If you're having trouble locating it, consulting the vehicle's service manual can provide further guidance.
The fan relay will be located in the PDB box in the engine compartment. The relay is controlled by the coolant temp sensor and the computer. Hope this helps.
bad fan or bad fan relay
On a 2006 VW Beetle, the coolant fan relay is typically located in the fuse box, which is found under the dashboard on the driver's side. You may need to remove the cover to access the relays. The specific position of the coolant fan relay can vary, so it's advisable to refer to the vehicle's manual for the exact location and layout of the fuses and relays.
jump power from the battery to the fan directly to see if the fan operates. if not, replace fan. interchange another relay with the fan relay to check the relay. there are usually the exact same relay located in the engine bay.