How to fix cooling fan issues for a 2001 jeep grand cherokee 4.0

The computer gets a signal from the engine temp sensor that the fan is needed, and grounds the fan relay to provide power to the fan.

Have you tried testing to see if the fan has power t it?

Be certain that your electric cooling fan is coming on. I have the same issue right now. It actually got so hot the first time we noticed there was a problem that it cracked my radiator. Replaced with one from Autozone for $150. Dealer wanted $350. I ordered a cooling fan on ebay that should come in today for $70.

bad water pump maybe or thermstat is froze shut. maybe the cooling fans are not working.

sound like the box computer has gone

Likely your fan relay internal contacts have burned closed. Relay should be either in the power distribution center or in front of the battery.

is it just staying on ??? yes may be relay cooling fan potentially but now main eng relays sometimes effect that same circuit..

relay sounds stuck...call a parts store for pricing

This means your thermostat is bad. Needs to be replaced. Also do coolant flush.

RADIATOR FAN WORKS OFF OF THE COOLANT SENSOR NOT THE IAT SENSOR. CHECK YOUR RELAYS AND ALSO SEE IF IT COMES ON WITH THE A/C AS THIS OVERIDES THE COOLANT SENSOR FOR THE FAN. MOST LIKELY CAUSE WOULD BE A FAN RELAY