Question about 1999 Jeep Grand Cherokee

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Engine fan i have replaced the whole fan and it will work for so many days then it will go out again. i need to know my need step to fit this.

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  • gh33cw23frea Jul 13, 2009

    rad fan

  • gh33cw23frea Jul 13, 2009

    the fan assembly came with a new one

  • Joseph Weisenberger
    Joseph Weisenberger May 11, 2010

    Did you use the same fan motor or did the fan assembly come with a new one?

  • Mike Butler
    Mike Butler May 11, 2010

    Rad fan, or blower/heater fan?

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Www.wjjeeps.com <--- the best site for WJ ! This is where I go all the time for reference.

2002 JGC Overland edition

Posted on Jul 31, 2009

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3.1L has rod knock. I have 20yrs of auto mechanic and built a few engines, but retired now.


If the knocking is from the bottom of the engine, it may be the big end bearings have worn.
Replace them or not? Difficult question.

Replacing the big end (crankshaft/piston rod) bearings may stop the knocking/rumble noise. It depends on the crankshaft..

If the crankshaft has worn oval on its journals, fitting new bearings is unlikely to achieve anything as the bearings may break up due to the oval of the crankshaft. Removing the crankshaft and checking the journals for ovality/regrinding if necessary isn't a 5 minute job.

You say you have good oil pressure. That's a positive.

Personally, in your situation, I would try an engine oil additive that's designed to eliminate knock provided the main bearings haven't worn down to base metal. It's the cheapest option.

Failing that - and again, personally - I would remove the oil pan and fit new big end bearings in the hope that it would work.

The next step, if that doesn't work - would be to remove the crankshaft and have it reground and fit oversize bearings. Or get a 2nd hand engine...

You say the car was given to you for free .. you have nothing to lose. Try an additive first.. molyslip/molybdenum or whatever...

Good luck ...

May 21, 2016 | Cars & Trucks

2 Answers

Where is Thermostat located?


Usually in the lower radiator hose.

Aug 19, 2015 | Cars & Trucks

1 Answer

F150 alternator


check the battery with a meter on volts. on a good charge it should be around 12.05v. run engine and test battery again should say around 13-14 volts. if you get 7-8-9 volts then the alternator is not working.. and the alternator is fitted to the fan belt has 2 bolts holding it in place, take the belt off. and remove its bolts and unplug the wire plug and un bolt the thick wire off the copper nut. replace with new or one known to be working.

Oct 15, 2013 | Cars & Trucks

3 Answers

It started two years ago. Started overheating. I took it to one place. They said that the fan (or the fan switch) was defective, so they replaced that. Helped for two weeks, but than it started overheating...


yes, they have very thin radiators, and they clog up easily,, flushing it will not clean them enough to matter, which in turn causes the fans to run more, and making them fail, along with the relays that fail out more quickly , I have an accord, and went through what all your going through,, changed the radiator, and problem was solved, I know that from 87 to 05 they pretty much used that skinny , not enough fin line radiators, , once you replace it, be sue to run the correct amounts of antifreeze in it at all times, this stops a lot of the build up. People will say you have to use the blue , heres a little tip, the only difference between the blue and green, that Honda sells, Is that the blue is already a 50:50 mix and the green is full strength, pretty much the same price too, so get the green., and mix it yourself 1/2 and 1/2 with clear water

Jul 26, 2011 | 2003 Honda Civic

1 Answer

How to replaced the water pump.


You didn't mention the model of your car. Regardless of what model it is, if you have a mechanical fan, you need to remove it. You will need to buy or make a tool that is a flat strap of metal with holes drilled in it spaced to fit over the heads of the 10 mm bolts that hold the fan pulley on. The tool holds the fan pulley from turning while you loosen the fan. The fan unscrews with left handed threads.
The plastic shroud around the fan comes out together with the fan. On some cars, the water reservoir is attached such that it is easier to pull the whole radiator out with the shroud.
The water pump fits pretty snugly in its hole. There may be a threaded hole in the pump cover that is 'blind. That is, when you screw a bolt in the hole, it pushes against the engine block to pull the pump out of its hole.
While you are replacing the water pump, you will want to replace the thermostat as well as preventative maintenance.
That is about all I can tell you without knowing what model car you have.

Feb 21, 2011 | BMW 325 Cars & Trucks

1 Answer

My radiator fan keeps running after shutoff, i need to know what is a headlamp module


an electric fan may run on after the engine is switched off to stop "hotspots"within the engine,but should switch off after,say,10/15 mins.dependant on outside temp and if you have just come off the highway.
a headlamp module is the whole headlamp lens,glass,fittings all in one unit rather than in bits....supposed to keep it weatherproof.....

Aug 28, 2010 | 2000 Dodge Caravan

2 Answers

My fans on my 2001 chevy impala aren't coming on.


You will need to check the integrity of the circuit first, and if there are no problems with the wiring, relay, etc., you will then need to test the coolant fan motor itself.

Jun 13, 2010 | 2001 Chevrolet Impala

1 Answer

The fan motor quit working.my sons replaced the cooling fan they hooked up the black wire and yellow wire were they belong but they ran a hot wire from the battery to the green wire. then the wipers and ac...


Step 1 - Remove green wire
Step 2 - Check for blown fuses
Step 3 - Pray the PCM is okay ;)

Adding wires to a car to boost performance in some way, whether to the cooling fan or to the fuel system may have worked 30 years ago, but it seems like the only mechanical thing in a car built after '83 is the engine. Causing power surges, feedback and power draws can and often will do more harm than good. If there's a problem with the cooling fan motor, even after replacement, the motor may never have been the problem. There's the coolant temp sensor, cooling fan relay, PCM..... too many possibilities to just throw parts at.

Let's just look at GM's, for an easy example. In the old days, pulling the positive cable off the battery was a sure-fire way to diagnose an alternator/generator. Nowadays, pulling the positive cable while the engine is running can cause a spike in the charging system so severe, it can fry the PCM. Fry the brain.

We can still service these vehicles at home, but we have to be careful. Where we used to adjust the choke to cure a cold start problem, now it may be the engine temp sensor. It may be the mass airflow sensor. It may by the throttle position sensor, map/baro sensor.....

Let me know what comes from this. Hopefully, no damage was done, and removing the wire and replacing any blown fuses will do the trick. Best of luck!

May 22, 2010 | 1995 Ford Escort

1 Answer

2000 grand marquis air/heater fan internmitent. Check electric, but it all good. It works most the time, but sometimes quits for a day or two and then starts up again.


Sounds like you need to replace blower motor speed cotroller, located underhood right rear of engine on A/C / Heater case on firewall, rectangular in shape. When fan stops working tap on controller, fan should come back on then you will know that is problem. Have seen this many times on this vehicle. Hope this helps, have a good one!

Jul 26, 2009 | 1986 Mercury Marquis

1 Answer

Cooling fan


Here are the cooling system diagnostic steps...First does the cooling fan kick on (with engine hot)? If not, check the fuse, if good then check the thermoswitch in the radiator (it's about an inch and a half in diameter located on the lower part of the radiator with two wires ) by disconnecting the wires and touching them together (again, with engine hot...at least 190 degrees) if the fan comes on, you have a bad switch. If not connect a 10 gauge jumper wire from the battery to the fan itself (there are three terminals,,, one high, one low and ground). With power direct from the battery (and a ground wire, if necessary) fan should run... if not replace the fan assembly... if it does run then you have a bad cooling fan relay (under the dash, I believe). Hope this helps... ;-)

Apr 19, 2009 | 1995 Volkswagen Passat

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