Question about 2002 Jeep Grand Cherokee

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2002 Jeep Grand Cherokee Laredo overheated, took to mechanic and they stated that it was a bad radiator cap and thermostat but once they put it back together, now they say it's the fan, fan was working when took it in.

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  • Gaye Walker
    Gaye Walker Jul 20, 2009

    I understand but after changing the radiator cap and the thermostat, and then to tell me that the fan went out seems kind of far fetch, and now want to charge me $600 for a fan assembly, relay switch and labor. Why didn't this supposedly expert know this before they replaced the radiator cap and thermostat. Is it true that a working fan would go out after replacing the thermostat?

  • Gaye Walker
    Gaye Walker Jul 20, 2009

    Yes.

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  • Master
  • 784 Answers

Overheat is causing by insufficient cooling. It is true the the Thermostat not open causing cooling stagnant not circulating to remove the heat then causing overheat. It is tru that the fan not turn on when the engine hot to assist cooling then engine overheat. The fan is running by electric activated by a temp sensor on your block engine. It this sensor is bad most likely then the fan gets burnt out since you said it works before. They could charge you for the fan by just replacing the temp sensor. If you locate a sensor on top of your block engine then, take off the wire from it, the fan should run when you you turn key to on. If it is not then you can jump short the 2 terminal of the wire off the temp sensor to turn on the fan. Or you can locate the 2 wire from your fan, pull tem off and check resistance from the 2 terminal any reading but not open that tells you the fan is good. Or you can connect the 2 wire to you battery to see if it turn on. The point is that you can check to see if their diagnosis is correct or not.
Other thing I recommend is if your fan working and after replacing the temp sensor , the Overheat problem is still exist, then flush out your radiator since it is the culprit. You may have to replace the radiator. Good luck.

Posted on Jul 20, 2009

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2000 Jeep Grand Cherokee Leredo is overheating I changed thermostat also my fan is not working and keeps saying coolnd low and its full and the heat in the car will not run hot it stays cold


Sounds like some type of blockage in the system.
with the car cool open the radiator cap, start the engine to see if the coolant has flow.
Even though you just put in a new thermostat it can still be bad,I've had this happen to me a few times.
If the flow seems slow to nill you can also try removing the thermostat all together and giving that a try.
You can test the thermostat in a boiling pot of water.
If ir is totally not the thermostat then there could be a few cooling chambers blocked in the radiator.
This can be repaired in most cases by a "Rod out" at a local radiator shop.
I think the problem is more twards the thermostat for the reason you stated about your heater.
good luck,Gary.

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1 Answer

1997 Grand Cherokee Laredo, 4WD, 5.2 V8. My Jeep overheated today. When I went to open the hood I could feel steam. So I waited for it to cool before taking the radiator cap off and see no fluid in it....


Have system pressure tested when cold and full to top. Pressure test will force coolant out and you will be able to trace the leaks location. Hopefully it's a small hose leak and not a major problem like a blown head gasket or cracked head.

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Bad themostat, dirty radiator (the front of it), corroded interior core of the radiator, weakening water pump, bad radiator fan.....just to name a few. More than likely? Low antifreeze level, or the thermostat.

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1 Answer

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If you put the thermostat in correctly (spring towards the engine) that should be OK. Likely if the water pump wasn't leaking or had a bad bearing, you wasted your $ on that.
If you re-filled it and did not have the heater on high heat, you may have some trapped air in there. But, still overheating says another thing. If you have a blown head gasket, it can pump compression into the cooling system and drive the coolant from the core. It will also overheat. You can have that tested at most any decent shop that will do a hydrocarbon test to find that.I think someone makes a chemical test kit for that but not sure if it's very expensive or not. White smoke from tailpipe will also be an indicator as will be any coolant in the engine oil or coolant on one or more spark plugs. If it turns out that it has a head gasket problem don't stop looking for problems as often a faulty fan or obstructed radiator can cause the initial overheat that caused the gasket to fail.

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1 Answer

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If it was overheating at freeway speed then it is a clogged radiator. Another cause of overheating is a timing that is retarded. These can be caused by worn timing components etc, although a possiblity it is highly unlikely on your car.

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If the engine is not overheating then the radiator cap seal is faulty

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1 Answer

I need to change the thermostat in a 1993 Jeep Cherokee Laredo


I'm going to assume that you have a 4.0 L6 (inline 6) engine) since that's the most common one. If not, most of instructions are the same. 1. With engine cool, or, pressure out of system, radiator cap off, remove both hoses from thermostat housing (top radiator hose connects directly to housing on front of engine). 2. carefully scrape all gasket material from housing and block. Make note of how the thermostat was installed (end with spring goes into the engine block). Since installation is vertical, I usually use silicone glue on gasket, installing thermostat into housing first, then applying gasket to housing, so that it will hold the stat in place when installing to block. (let glue dry for a while). 3. Put a thin film of silicone on engine side of gasket, position assembly on block and put in the easiest to access bolt, finger tight. Be careful not to move assembly around too much or you may cause the thermostat to go out of position. Put in the second bolt, again, finger tight. When both bolts are installed, tighten each, going back and forth, taking up tension equally (don't tighten one, then the other one all at once). 4. replace both hoses, fill to replace any coolant lost (usually not very much). Start engine and run with cap off radiator and heater full "on". Watch temp gauge.When up to operating temp, add more coolant if necessary. (also monitor radiator during this stage for overflow or overheating. it is sometimes necessary to intermittently add some coolant while engine is coming up to temp. as some overflow is normal). 5. close cap and run for several more minutes. Check hoses and therm gasket for seepage. Some re-tightening may be necessary, but if excessive you may have made a mistake you should not have to "crank down" really hard on any hose clamp or fastener. PS, I usually remove and replace spring type hose clamps with screw type. They are more reliable and easier to work with!
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