Question about 1990 Jeep Cherokee Limited

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1990 jeep cherokee 6cyl inline- electric radiator fan inop.

The electric radiator fan works when I jump the connector to the battery but it isnt coming on at temperature causing the engine to overheat in stop and go traffic when the additional cooling fan is needed. How do I test the coolant temp sensor that screws into the radiator and activates the fan? Does it only have power when the engine is running or will it continue to run after engine off until the coolant temp goes down? Is there a fuse I should check? If so where is it? Thanks.

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  • markoconnell Nov 27, 2008

    appear

    s to be a faulty coolant temp sensor not closing at 190 degrees to activate the electric fan. I will replace it and see if fixes the problem.

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The aux fan only works when the ac is on, and has come to a predetermined temp(?) i found this out while going up a long grade in the back country without the ac on and later found out the radiator was half plugged!

Posted on Nov 22, 2008

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1 Answer

98 jeep Cherokee keeps over heating


Several possibilities, including blockage in coolant tubes of radiator, damaged or slipping impeller on water pump, blockage of air flow through radiator, inoperative radiator fan(s), damaged head or head gasket...

Does the radiator fan come on? If not, problem could be bad temp sensor or fan motor or wiring.

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most 93 to 95 have viscus clutch not electric fan (A/C evap fan sure) but some do have the Aux fan too. and the PCM reports DTC errors, if the relay fails. did it? report that?
ok the 95 XJ with 4.0 does have fan.... have FSM in hand.
If the ECT has air pockets it well never report hot temps.
it will not energize the Fan relay if the ECT fibs. for any reasons.
page 35 Chapter 7
the viscous fan locksup at (165° to 180° F).
the electric fan is as follows.
i guess you never looked in the PDC before or its lables
"The fan is controlled by the cooling
fan relay, which is located in the power distribution
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"When coolant temperature is above 88°C (190°F),
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given these facts? why not turn on A/C and end the guessing.

I use my scan tool , and innova 3140 for jeep OBD1.
it shows me what he pcm sees for ECT readings
if the engine is at 100C and the ECT shows way lower
its bad. or has air pockets around it,
no ect runs in air and works, none,.
if say the ECT is at 100C and the fan relay is not closed
the relay is bad or ECU driver to it blown. (bad ecu)
if the relay coil is hot, and the fan is not the relay is bad.

if the relay is closed and 12vdc out of it, then fan is dead.
if the fan is good (hot wired), and the relay out is hot , the wires are bad from relay to fan.
a $10 voltmeter and the guessing ends.

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Sample pictures here

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