Question about 1989 Jeep Cherokee

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1989 Jeep cherokee Laredo over heating and the fan wont kick on, plenty of water in the radiator? How do I check to see if it is the thermostat sticking closed?

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When it's overheating check to see if the lower radiator hose is hot. if not therm is bad. If OK, check temp sensor on thermostat housing. signal from there goes to the computer, then to fan relay to turn on fan.

Posted on May 10, 2009

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Electric fan wont kick in jeep over heats replaced thermostat and two sender units


Sounds like your cooling fan relay is bad the jeep grand cherokees are known for this, first thing i would do is unplug the radiator cooling fan and run 2 jumper wires direct from the battery to the fan connector if the fan kicks on your fan motor is good and the relay is bad, if the fan doesnt kick on replace the fan motor with a new unit, the cooling fan relay on your particular model jeep is located under the passenger headlight and requires you remove the front bumper to replace it, however some people cut a small hole under the headlight to access the relay the faster way but if your not to keen on cutting holes in your car remove the bumper and replace the relay if the fan checks out and you wont be overheating anymore...

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Sep 26, 2009 | 1989 Jeep Cherokee

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Ok, fans work but you should replace temp. sensor so they come on automatic. If the temp gauge inside the car is getting really hot its either because the termostat is stuck closed or your water pump is pumping water to circulate it through the radiator and engine

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2000 JEEP GRAND CHAROKEE LAREDO OVERHEATS WITH NEW RADIATOR AND FAN..HOW DO I FIX THAT?


You may either have a bad thermostat or a bad fan relay. If the fan is not turning on at all then the relay is bad. If there is not any heat coming through the heater then your heater core is plugged. That would also cause an overheating problem as well. To rule out a bad relay check to see if you are getting 12 volts at the fan connection. If not change relay.

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Over heating when sitting at idle for a short while


It sounds like it may be your electric cooling fan. When the car is sitting idling does the fan behind the radiator ever come on? If not then this is your problem. Your car doesn't overheat when it moving because you're passing air through the radiator with the movement of the car. The problem could be the fan itself, the fan relay, or a temperature sensor.

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2001 Jeep Grand Cherokee Laredo Overheating


Three possible solutions:

1. Bad Thermostat

2. Fan Relay (most likely)

3. Bad Fan

When the GC reaches a temp of 180 Deg. F the fan relay sends a signal to the fan to turn on, once the temp lowers (around 155 Deg. F) the relay turns off the fan, and so the cycle continues. If the relay is bad there will be no signal to the fan to run. While you are driving your vehicle there is ambient air moving thru the radiator, cooling the engine, but once you encounter slow/heavy traffic or stop there is no air moving and the temp goes up, the fan will not kick in and the vehicle will overheat.

If the fan motor is not working the same will happen, but a more expensive fix, as the motor comes with the fan.

If the Thermostat is stuck in the open position, the water travels to fast in the engine and heat exchanging is not an efficient process, therefore the vehicle might overheat when stopped or in slow traffic.

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1995 jeep lalredo 4x4 keeps geting hot


The problem with these jeeps is that the older they get the more clogged the radiator geats.
The radiator in the Cherokees are only a single row of tubes.
You can try to flush out the radiator, but replacing it with a heavy duty type is probably a better option.
Your car is not getting enough flow to cool down the engine.
Also you want to check that the electric fan is coming on. There is a coolant sensor in the radiator.

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Your cooling system is air locked it need need to bleed it. The easiest way is by a 5/8" heater hose T and install it on one of the heater hoses. It make bleeding really simple.

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