Question about 2004 Jeep Grand Cherokee

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Engine overheats engine continues to overheat. fan does not turn

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  • 630 Answers

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

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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

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SOURCE: fan speed switch continues to melt,wires overheat

Fan motor may be partially failed and is drawing too much power.

Posted on Apr 15, 2009

  • 335 Answers

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

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SOURCE: My 2000 Jeep Grand Cherokee overheats in traffic

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

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SOURCE: fans dont work and overheats 94 toyota tercel

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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The coolant fans and radiator fans are new replaced and both fans don't work when car is turn on and car overheats on the Lexus es300.


The air con fan comes on when the air con is engaged, the engine fan comes on only when the engine reaches operation temp. controlled by a temp. switch. on the block or radiator .

May 06, 2017 | Lexus Cars & Trucks

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Get very hot and overheats


Check your coolant level.
There will be a resevoir tank somewhere under the hood. make sure the level is at par, and continue checking it after driving for about a week, because the level of coolant in your rad may be low, so it will draw more from the resevoir, dropping that level again. Need to make sure it stays off.
If coolant level is fine, then you will need to check the temp sensor, and coolant sensors.
Do any lights come on in the dash? (ie. service engine light, check engine light, etc?)

also check to make sure, while the vehicle is running, that the fan turns on. If this doesn't turn on, ever, even while the engine is too hot, then that will cause the engine to overheat.


I hope this helps!

Jan 11, 2011 | Mitsubishi Pickup Cars & Trucks

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I have a Prelude '97. It overheats. I replaced the readiator, water pump, and one of the fans, but it still overheats when going uphill or when in slow traffic. I've noticed that the fan that is...


will try to help. the fan you replaced, was it the air conditioner fan? if so. then you need to check your primary fan. the one that does come on when the engine reaches operating temperature. make sure by starting engine, let the motor run and the temperature guage reaches the normal operating temperature.if the main engine cooling fan does'nt come on, then you'll need to check the fuse box under the hood. relays are black square plug in's they are marked and will[fan relays] tick when you turn the key on] if main engine fan does not come on when engine overheats, #1 fuse blown #2 relay bad #3 main cooling engine fan bad. note; the air conditioning fan will come on with engine running,when air conditioniing is turned on. when the a/c is turned off, the a/c fan will not be turning. hope this helps and as always, thank you for choosing fixya.com

Nov 28, 2010 | 1997 Honda Prelude

1 Answer

Changed head gaskets @400,000 km. Now overheats. New rad, thermostat, water pump, removed thermostat, still continues to overheat.


unclip topmost hot hose when engine is running to vent any airlock.
have you checked fan rotation......?

Aug 25, 2010 | Toyota 4Runner Cars & Trucks

1 Answer

Dashboard overheat warning light blinks continuously after 5-mi


It is not the thermostat since it only overheat on stop n go situation. Most likely cause is a bad radiator fan. Turn on the AC and see if both the radiator, and the condenser fan works. They should both be working when the AC is turned on. Lets stick to this for now. Let me know what happened. I don't want to confuse you with too many possiblity.

Nov 14, 2009 | 1998 Volkswagen Jetta

1 Answer

Overheating


Is the fan now working? Your engine will continue to overheat if you have not fixed the fan. Check the fuse for the fan, connectors, and replace the fan if necessary.

Sep 28, 2009 | 1995 Cadillac Eldorado

1 Answer

Fan stoped working


You didn't say where you were or what the outside temperature was running, but if the fan isn't coming on and the motor isn't overheating, I have to assume it is still too cool in your area to cause the fan to kick in. Try turning on the air conditioning to see if the engine starts to overheat. If it does get hot and the fan doesn't kick in, check the fan motor windings for continuity with an electrical tester. If you don't get continuity, you have a burned wire. If you get continuity on the windings, don't forget to check if you have continuity from the windings to the motor frame, which would indicate a short. The fuse should be in the block to the lower left of the steering wheel, and the relay should be in the little plastic box near the firewall under the hood. I am betting on the fan motor, which is readily available at your local junkyard.

Jun 06, 2009 | 2000 Dodge Caravan

1 Answer

When idling saturn ls 4dr sedan wants to overheat


Sounds like either you are low on coolant or the cooling fan isn't working. With engine cool remove radiator cap and check coolant level, top off if necessary. If full start engine and turn on A/C full blast, full cold the cooling fan should come on almost instantly, unless there are two individual cooling fans in which case only one may turn on. If no fans turn on check all fuses whether related to fan or not. If all fuses fine try swapping relays around, they are usually all the same size/style. If fan still doen't work you have either an open positve or ground side of the circuit, Which will require wiring schematics and a multimeter. If coolant full and fan/s turn on and engine still overheats you'll need a new thermostat installed.

Mar 24, 2009 | 2000 Saturn Ls 4dr Sedan

2 Answers

95 grand am radiator fan only runs with AC on


Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment.
I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson

Feb 04, 2009 | 1995 Pontiac Grand Am

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