Question about 2001 Jeep Grand Cherokee

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2000 jeep cherokee overheating

I need to know if you are calling the PWM fan control module relay that is used to control the speed of the electric radiator cooling fan a "fuse". IF not where is this fuse located? The relay is on the passenger side behind the vacuum reservoir,behind the bumper and grill. I am having the same overheating problems at idle and low speeds. Thanks,Ken

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Boy ken are you lucky I just went through this with a customers jeep. The cooling fan controll relay/module is behind the right headlight- but not that easy. I had to remove the battery,fusebox and loosen the wiring harness to get to SEE it. when u remove the headlight you can't see it because of the plastic under/behind it. look down from the top on the top of the inner fender well(behind/under headlight) and see a little box aprox.1.5"x1.5"x3/4"thick. it has 3 wires going to it. remove the two 8mm mounting bolts(near impossible) and replace it. I hate to admit this but it helped to drill a hole int the headlight bucket to get straight to the bolts to properly mount it again. when you get the part from the dealer it comes with new mounting hardware and is only about $45 retail. OOOhh yeah don't expect the fan to come on right away after you replace the module. Turn on the a/c and give it 2-5 minutes to come on while engine is running. I'll keep an eye out for ya if you need more info..

Posted on Aug 31, 2008

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2009 chevy hhr speakers don't work and a/c radiator fan won't come on


What engine does it have ?

Cooling Fan Control 2.0L
The engine cooling fan is a variable speed fan. The engine control module (ECM) controls the fan speed by sending a pulse width modulated (PWM) signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the engine cooling fan motor in relation to the PWM signal. The cooling fan speed can be adjusted from 10 percent to 94 percent duty cycle. 94 percent is considered high speed fan.
Cooling Fan Control 2.2L or 2.4L
The engine cooling fan system consists of one cooling fan and one relay. Voltage is supplied to the relay through a fuse. The engine control module (ECM) controls the fan operation by grounding the cool fan relay control circuit. When the cool fan relay is energized, voltage is delivered to the cooling fan motor. The cooling fan motor is grounded through its own ground circuit.
When the request for fan activation is withdrawn, the fan may not turn OFF until the ignition switch is moved to the OFF position or the vehicle speed exceeds approximately 10 mph. This is to prevent the fan from cycling ON and OFF excessively at idle.


Just one speaker doesn't work ? Do you know how to do automotive electrical testing ? That's how to find both your problems . Speakes work by electrical inpluse's . The A/C radiator ( condenser ) fan also works by B+ voltage through a fuse an a relay , controlled by the engine electronic control module or PCM - powertrain control module . When you push the A/C turn on button , it sends a signal to the PCM . The PCM will then energize the radiator fan relay turning on the fan . Check fuse in the under hood fuse box , If the fuse is blown you have a electrical short , too much current flow . Plus if the PCM sees too much pressure in the A/C system it will not let the A/C work .

Mar 31, 2017 | Cars & Trucks

1 Answer

2002 Grand Cherokee Larado AC cooling fan (small fan in front of radiator fan) stuck and was running after car was switched off. I had to disconnect the battery to get it to stop running. When I tried to...


IT DONT WORK THAT WHY. (on/off)
NO ENGINE STATED, SO on exact answers. 4.0L or 4.7L ???
The engine cooling and HVAC rules govern this (computer tables and logic)
the service manual cover that,
did you SCAN the PCM at the failure then scan it again after, no?
did you know some cars run the fans parked to prevent overheat soak damage to the engine and trans? all have hood sticker warning telling you to stay way from fans, , until fully cooled engine or pull battery neg lug for safety. just saying that so you are safe fiddling all cars.

the fan(s) run via truth tables, logic (computer)
if cold outside why run a fan?, and waste fuel and cause green house gasses for fun. or make noise for fun, answer it doesn't.
it runs the fan ONLY when needed, is the answser
and is very complex, the newer the jeep gets.

On most cars even as old as 1995 , the condensor fan control would stay off if ambient temps are below 50f. this is not new logic.
Chapter 24 covers HVAC. in The service manual SM.
not only that, you failed to test the AC per the SM and failed to scan the PCM to see if there are HVAC faults. causing this fan disablement's. on purpose.
this car come with 2 type HVAC, manual and ATZ (climate control fancy) the rules for each are not the same (potentially)
the PCM controls the radiator fan on the 4.0L with a relay.
so is 100% pure (ATZ/BCM/PCM) logic doing that.
the 4.7L has hydraulic motor powered engine cooling fan
as you many not know the A/C condensor rams hot AIR
to the front of the engine RAD and cause it to overheat
so the engine fan is very much part of this regulation system.
The AC will also shut down for many AC related errors
and will do so if the engine or transmission over heats.
Self preservation.
there are 3 , 4.0L systems, for fan control
clutch fan or electric and one has a PWM modulated fan control module (its a transistor not relay in this case)

her is what chapter 7 states
PWM FAN CONTROL MODULE -
4.0L
DESCRIPTION
The pulse width modulated (PWM) radiator cooling
fan relay is located behind the front bumper fascia
below the right headlamp.
OPERATION
The PWM relay is used to control the speed of the
electric radiator cooling fan. It allows for multiple fan
speeds. This allows for improved fan noise and A/C
performance, better engine cooling, and additional
vehicle power.
PWM relay operation is controlled by the Powertrain
Control Module (PCM). To operate the PWM
relay, the PCM looks at inputs from:
† Engine coolant temperature
† Ambient temperature from the body controller
† Vehicle speed
† Transmission oil temperature
† A/C switch position (A/C request)

the SM does not list all rule and tests for this device.

more..?
here more quotes from your missing book
If an open or shorted condition has developed in
the relay circuit controlling the electric radiator fan
or fan control solenoid circuit controling the hydraulic
fan, a Diagnostic Trouble Code (DTC) can be set.
If the problem is sensed in a monitored circuit
often enough to indicated an actual problem, a DTC
is stored. The DTC will be stored in the PCM memory
for eventual display to the service technician.

fans stuck on quotes
1. Fan control sensors inoperative.
1. Check for DTC's. Verify sensor readings.
2. Fan control solenoid stuck 9on9. 2. Check fan operation speeds. Refer to fan
speed operation table.

3. Fan control solenoid harness
damaged.
3. Check for DTC 1499. Repair as required.
4. Transmission temperature too high.
4. Check for transmission over temp. DTC.
5. Engine coolant temperature too high.
5. (a) Check coolant level. Correct level as required.
(b) Thermostat stuck. Replace thermostat.
(c) Water pump failed. Replace water pump.
(d) Coolant flow restricted. Clean radiator.
(e) Air flow over radiator obstructed.Remove
obstruction.


the 4.7 liter engine the fan speed is base on above
and says, A/C system pressures.
the 4.7 then can can run at 500 rpm even when OFF. (SM)

now how to test the fan.
get engine hot, (drive 10miles say)
then park, and lest engine idle until the engine overheats
it will (but not in alaska, dig?)
and then the fans come on at bout 225f .. (about this is ball park)
electric fans
if using a 4.7L say so, its totally DIFFERENT

Mar 15, 2017 | 2002 Jeep Grand Cherokee

1 Answer

I have a 2001 Grand cherokee Laredo, 4.0, 6 cyl. Have had the Fan Relay replaced and Control Module because of overheating. Now it is overheating again. Any suggestions? And are the fan relay and...


If the fan is not cycling when the engine gets hot, you'll have to test the fan motor and the temperature sensor. If the fan is running and it's still hot, the thermostat may be the cause.

Oct 21, 2010 | 2001 Jeep Grand Cherokee

1 Answer

Jeep cherokee 2000 heater fan does't run


If it doesn't run on any speed then check fuses and relay's under the hood in the power distribution box,if all are good then use a test light or volt meter on fan motor wires with fan switch set on high,if you have power there then replace fan motor,if the fan works on some speeds and not others than check the fan speed control module,it is located in the air duct on pass side below glove box.

May 03, 2010 | 2000 Jeep Cherokee

1 Answer

Do you know where the radiator fan motor relay sensor would be?


The Pulse Width Modulated (PWM) cooling fan relay is located below the right headlamp behind the bumper fascia.

Nov 05, 2009 | 2000 Jeep Grand Cherokee

2 Answers

Location of cooling fan relay


Hi,
The pulse width modulated (PWM) radiator cooling
fan relay is located behind the front bumper fascia
below the right headlamp in the 4.0l.
It is held on by 2 bolts.
Hope this helps.
Iain

Oct 14, 2009 | 2000 Jeep Grand Cherokee

2 Answers

Coolant leaking replace every three days coolant fan wont stop ru


This link has a diagram showing the location of the relay: http://autorepair.about.com/library/faqs/bl581g.htm

The Pulse Width Modulated (PWM) radiator cooling fan relay is located behind the front bumper fascia below the right head lamp.

Sep 08, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Hi i have a 2000 jeep grand cherokee the problem is the elec fan dose not turn on where is the sensor the turn on the fan. the fuels are ok.


This is controlled by a relay module .The location is under the passenger head assembly.Dumb location i know but that is were it is at.There is also problems with the fan assembly it self .Test for power on the red wire at the fan with the ac on this will make the computer tell the relay to start the fan. The relay module is not easy to get at :( i hope this helps .

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1 Answer

2000 jeep cherokee sport - a/c heat control fan stopped working - the blower resistor looked burned so I replaced it - no change - next I relaced the control module - no change - the two related fuses are...


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Jul 03, 2009 | 2000 Jeep Grand Cherokee

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