Question about 2004 Jeep Grand Cherokee
Run volts from battery to fan motor....if it turns problem is either in the fan motor sensor/electrical connector(corroded, etc.) or if equipped with a fuse possible blown but doubtful.
Posted on May 06, 2010
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Posted on Jan 02, 2017
SOURCE: cooling fans dont turn on
sound like you have a bad sencer or relay. you can run a wire from the fan . to a wire that run on when the car start and trun off when you trun the car off.that will get you by for a short time good luck
Posted on Apr 12, 2009
SOURCE: car overheat
The rad fan is required to keep your engine at a normal operating temp. When you are going at hiway speeds the fan is not needed. When you stop then the fan has to operate to keep the engine cool.If the fan is not operating, it could be the fuse or fan relay or temp sensor or computer This problem should be checked by someone who is a professional..
Posted on May 09, 2009
You said something very important in your post. since you replaced the controls for the fan, have you checked to make sure the fan itself is good? You can easily test that by hot wiring it directly to the battery. If it fails to operate, replace it. Also check the outside of the radiator for obstructions such as bugs or leaves packed into the A/C condenser in front of the radiator or leaves stuck between the radiator and the condenser. If the radiator is internally blocked it is difficult to detect as most of the radiator is not accessible most shops use a heat sensing gun to check that.
If you decide to flush the system, flush the radiator separately from the engine as internal rust from the block will pack up in the radiator core and make the situation worse.
Another item to check is the clutch fan...It should not freewheel when the engine is hot.
The reason that it overheats in traffic is that in reality when at speed you don't need the fans...air flow caused by the speed of the vehicle is sufficient to keep everything cool. When in traffic you need fans to create that "wind" and any obstructions to the radiator become far more critical as Jeep radiators are borderline too small for the system in the first place.
Refrain from driving till you fix this as you can cause far worse problems (blown head gaskets) if it runs hot or overheats too many times.
Posted on Apr 29, 2010
Testimonial: "Thanks alot. Very helpful!!!!!!!!!!!!!!!!!"
Most systems work pretty much the same. First check the fans themselves by hot wiring them to the battery. If they work, you need to check the engine temp sensor (some vehicles use one for gauge and fans, others use a separate one for fans) relay, and of course any fuses.
You will help yourself a lot by getting either a chilton or haynes manual to show you how to do testing.
Posted on Jun 20, 2010
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