2000 xj cooling system troubleshooting - JeepForum.com

 
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post #1 of 6 Old 03-14-2017, 12:39 AM Thread Starter
bender18
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2000 xj cooling system troubleshooting

hello all! I am an avid jeeper and I am on my 2nd Cherokee


question: My Cherokee lately has been running WARM 215-220 see picture. The water pump was changed 6 months ago in Florida prior to moving to Utah. For the entirety of the drive it never climbed past 210.


The e fan turns on just past 210 when idling, however it wont pull it back down to 210 unless I turn the heater on full blast. once the gauge reaches 210 again with the heater on the E fan shuts off. When driving in 50 degree weather with the heater on the temp stays a smidge past 210, with heater off it goes almost to the next mark past 210 NEVER PAST THE NEXT MARK. The coolant level stays the same weather it is hot or cold in the reservoir tank.


Thus far I have washed the radiator with a hose, I put a stick on the fan clutch and it did not stop it so im assuming it is in working order.


Plan for Friday:
Swap radiator
lower and upper hoses
radiator cap
change thermostat? which is most recommend ?195?


Am I taking the right steps? should I try other stuff first?

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post #2 of 6 Old 03-14-2017, 12:41 AM Thread Starter
bender18
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post #3 of 6 Old 03-14-2017, 01:34 AM
BagusJeep
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You could check the actual temp with a hand held temp meter, the gauges are notorious. However, a sudden change in reading normally means something is afoot.

Flushing the system, running with water, flushing again and refilling with proper coolant could solve your problems, but unlikely. I am trying a summer coolant additive this year, probably a waste of time. You could try a rad flush but the citrates in most of them are fairly mild and may not have a great effect. You could take the rad to a rad specialist for a service.

You are dealing with an ageing system that was marginal when new, the engine bay is very crowded. If there are no leaks and obvious signs of failed parts, it is probably falling performance.

If your pump is working and your radiator is not blocked (???) the problem is often that the fan is not working hard enough. The mechanical fan is the workhorse in an XJ and has a thermostatic fan clutch. The fan clutch wears with time and the amount of power it transfers to the fan when hot starts to drop and the fan blades start to slow. From the factory it may have had about 30% slip, over time this increases and after 10 years it may be slipping 60% plus. If you have an original fan clutch, it may be time to replace it. They are available in various duty ranges, a "heavy duty" clutch merely slips less, using more engine power to turn the fan faster.

If you are fighting high ambient temperatures, look at one that slips very little. This will increase fuel consumption!!!

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1981 CJ7 258ci - Bagusjeep
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post #4 of 6 Old 03-14-2017, 01:49 AM Thread Starter
bender18
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ok maybe I will swap the fan out too while I have the radiator out. not a bad suggestion. at that point the cooling system would be almost 100% new.
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post #5 of 6 Old 03-16-2017, 01:17 PM
ArmyStrongMD
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It is pretty easy to swap out the clutch fan for a second electric fan and wire it to the current electric fan. That may be the cheapest solution to keep temp in line, since you have already done your water pump...

If you're replacing the radiator anyway it could be a worthwhile cooling upgrade. I am considering doing it on mine and adding a manual switch to activate the new fan just in case.
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post #6 of 6 Old 03-17-2017, 02:19 PM Thread Starter
bender18
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update: i swapped out the thermostat for a 195 failsafe from autozone (i know autozone pee off). its cooling better now, at stop lights with the AC on full blast it creeps a little past 210. However, driving it stays right at 210 or below with the AC on full blast. the thermostat was the original it had the Chrysler logo on it lol.

in the near future i am still going to replace the radiator, upper and lower radiator hoses, and the fan clutch.

Thanks for the input from everyone! i will continue to post as i make the changes for anyone with the same problem!
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