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Coolant gage

Black1990jeep

NAXJA Forum User
Location
california
On the XJ have have the 1990 FSM Factory Service Manual.

We are trying to trouble shoot the temp gage.

Page 8E-4 has a chart listing temp and ohms of the sender...

100F 1365 ohms
220F 93.5 ohms
260F 55.1 ohms

Three pages later the wire diagram on 8E-5 lists some temp ohms values that do NOT agree with the chart

On the Instrument Cluster Diagram...

100 1600 ohms
180 309 ohms
240 113 ohms


What gives with these values, they cant both be correct?


Anyway friend complains his XJ is too hot, The dash gage can get up to 3/4 full range when climbing a long hill in hot weather. He has a 2001 model, mine is a 1990.

Anyway the discrepancy in my service ,manual is distressing. Perhaps a typo? would some one who has a later manual please report what values are listed for the coolant gage resistances?

THANK YOU
 
You're trying to use a 1990 service manual to troubleshoot a 2001. That's the problem.

On pre 97 XJs they used two different temperature sensors, the one in the thermostat housing feeds information to the computer and the one on the driver's side rear of the head feeds the dash gauge. These two sensors have different specifications.

On 97+ XJs they used only one sensor to feed data to not only the computer but the gauge and deleted the head mounted sensor. You need to dig up a FSM closer to the year model of the Jeep you are working on.
 
Here's a chart for 1997-2001 Cherokees.

327962d1501257586-coolant-temperature-sensor-testing-ect_iatresistancechart.jpg
 
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