How can I tell if my Jeep Grand Cherokee radiator fan is good?
Check the radiator fan switch if the relay proves to be good. If the fan switch is good, check the radiator fan by using the jumper wires from the battery to the electrical connection on the radiator fan to wire it directly to the battery. If it fails to operate the fan is bad.
Where is the relay on a Jeep Grand Cherokee?
A Jeep has more than one relay that are the same (go by the relay number on the top or side of the relay) in the fuse box on the driver’s side fenderwell. Remove a known good relay and swap it with the radiator fan relay. Operate the vehicle and check the operation of the unit replaced.
How do you test a Jeep Grand Cherokee?
Test the relay using jumper wires and a voltmeter. Connect one jumper wire from the battery positive terminal to the relay positive terminal. Connect the second jumper wire from the negative terminal of the battery to the negative terminal of the relay.
Why is the radiator fan not working on my Jeep Grand Cherokee?
Remove a known good relay and swap it with the radiator fan relay. Operate the vehicle and check the operation of the unit replaced. If the unit works with the fan relay it proves that the relay is not the problem. Test the relay using jumper wires and a voltmeter.
Why is a radiator important in a Jeep Grand Cherokee?
A Jeep Grand Cherokee radiator is an extremely important part of your vehicle’s cooling system. No one likes to be stranded due to an overheating engine, and the damage from too much heat is often severe.
A Jeep has more than one relay that are the same (go by the relay number on the top or side of the relay) in the fuse box on the driver’s side fenderwell. Remove a known good relay and swap it with the radiator fan relay. Operate the vehicle and check the operation of the unit replaced.
Do you need antifreeze in a Jeep Grand Cherokee?
Your Jeep Grand Cherokee expresses your individual style while still being the practical people-hauler your family depends on to take them to any destination. Keep your vehicle performing its duties by maintaining its cooling system with antifreeze from AutoZone.
How can I tell if my radiator fan is bad?
Check the radiator fan switch if the relay proves to be good. If the fan switch is good, check the radiator fan by using the jumper wires from the battery to the electrical connection on the radiator fan to wire it directly to the battery. If it fails to operate the fan is bad. 25 people found this helpful. 19 people found this helpful.
What makes the radiator fan turn on or off?
A radiator temperature-sensing switch activates the fan relay at 198 degrees F turns the fan on and controls its operation. Make sure the key is off. Switching relays is the fastest way to check for a bad relay when possible.
How does the cooling fan work on a Jeep Grand Cherokee?
The cooling fan in a Jeep Grand Cherokee keeps engine temperatures at the correct level by kicking on during times when the engine reaches higher-than-average temperatures. Without it, the engine can reach dangerous temperatures and damage engine components.
Why does my Jeep Grand Cherokee radiator not turn on?
When the negative wire is attached to the relay, the relay should have an audible click as it activates. If the relay fails to click, move the jumper wires to the second set of terminals in the event the wrong terminals were being used. If the relay fails to click it is bad. Check the radiator fan switch if the relay proves to be good.
A radiator temperature-sensing switch activates the fan relay at 198 degrees F turns the fan on and controls its operation. Make sure the key is off. Switching relays is the fastest way to check for a bad relay when possible.
How to troubleshoot a jeep PWM fan relay test?
Radiator Fan Motor Circuit Wiring Diagram (1999-2003 4.0L Jeep Grand Cherokee). TIP 1: The way I’ve designed the Jeep PWM fan relay test, you’ll need a scan tool that can read live data (not a code reader), since you’ll need to keep an eye on the engine’s coolant temperature with it.
What is the PWM code for a Jeep Grand Cherokee?
This tutorial will help you to diagnose the Pulse Width Modulated (PWM) fan relay on the 1999-2003 Jeep 4.0L Grand Cherokee SUVs and/or the codes P1491 ( Radiator Fan Control Relay Circuit ). The dealer, at the time of this writing, will charge you $95 (US) to diagnose it.