Question about 2004 Jeep Grand Cherokee
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Posted on Jan 02, 2017
OK here we go you will need a test light for the following tests, i will try to be as descriptive as possible so lets get started
fist start the engine and turn on the a/c that should command the fan on.
right front engine compartment next to the battery is the power distribution center pop off the top, ground your test light to the negative battery terminal and find fuse number 10 it is a 40 amp fuse check both sides of this fuse with your test light, if you have power on both sides of the fuse than we shall go further.
unplug the connector from the cooling fan, there should be two wires in the plug one is dark green and the other is black with a pink tracer, with your test lite grounded to the negative battery terminal check the dark green wire for power, if there is power there than move your test light ground clamp to the battery positive terminal and test the black wire for ground,
if testing the black wire made the test light shine than the ground circuit is good, if it did not than check you ground connection behind the right headlight.
when testing the dark green wire, if the dark green wire made the test light shine and the ground circuit is good than you simply have a bad coolant fan motor.
I suspect you were not getting power to the fan motor so you will need to take a look at the radiator fan relay, this is a special solid state relay mounted to the inside of radiator core support on the right side down behind the bumper.
here you will find a single plug with 4 wires in it
black = ground
dark blue / pink = relay controll from pcm
dark green = output to radiator cooling fan
gray = battery power from fuse # 10 in pdc
unplug the relay ground your test light to the battery negative terminal, with the engine running and a/c turned on check the gray wire the test light, it should turn on if not recheck fuses.
move your test light to the battery posistive terminal and test the dark blue / pink wire, if the test light turns on than you have a bad radiator fan relay, you can pick one up at your local parts store for about $85.00 just make sure you get a high quality one the cheap ones have a hard time with the amprege consumption of that fan.
Posted on Jun 14, 2009
SOURCE: 2002 jeep cherokee laredo
My 98 Jeep Grand Cherokee had the same problem. Over heated when standing still. Took it to dealer and they could not find any problem with cooling fan. After doing my own investigation I found out that the electric cooling fan would begin to seize up after about 1hr. of operating. (gets hot)
The dealer would look at fan and see that it was running and think its ok. The problem is, it wasn't running fast enough.
I have a relay on the right side of front fender and jumped the fan to stay on with motor off. (must know what your doing). After about 1hr. fan started slowing way down. Returned it to dealer told them what the problem was. They were not smart enough to jump the relay so they put a couple hundred miles on it even though i told them it works OK when moving. Make sure you tell dealer to use the relay to jump.
Replace cooling fan motor. Works great
Posted on Feb 27, 2009
You can do one of three things.1. buy a scan tool 2. go to a dealer and pay to have the codes read and diagnosed 3. go to your local parts chain to have it read for free. (call first to verify). The code will tell you what system is malfunctioning and what the malfunction is. The parts store option is my choice, because you can also get the part to fix it if needed and you are not out the $ for diagnostics, nor did you need an appt to get it in.
Posted on Apr 26, 2009
At this point you have a few items to check. 1. is there power at the fan, if you hot wire the fan to the battery does it come on? 2. is the relay good? (may be in front of battery or in power distribution center.) 3. Is the temperature sending unit good? sender send signal to computer, computer sends ground signal to relay that turns on fan. Also check main fuses in dist center.
Posted on Oct 01, 2009
Testimonial: "Thanks i will look into what you suggested!"
There's a thermostatic switch that kicks the fan on and off. It is apparently shorted, causing the fan to run continuously. Check with your local auto parts store -- you be able to replace the switch without having to replace the entire fan assembly. In the meantime, pulling the fuse is a lot better than disconnecting the battery. You won't lose computer memory, clock, stereo memory, etc.
Posted on Oct 20, 2009
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