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The most common problem with 1999 and up Jeeps over heating is the cooling fan relay. On your 2003 Jeep, if it has an A/C, check to see if the A/C clutch remains engaged when you turn it on. Both the cooling fan and the A/C clutch runs off the same relay circuit. The cooling fan relay is located below the passenger side head light assembly, you'll need to remove the fachia to access it.
Low coolant
Cooling fan not working
Defective thermostat
Plugged or restricted radiator
Bad radiator cap
System airbound
Hoses collapsing under pressure
Water pump not circulating coolant
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoI have been having the same problem with my 90 Cherokee Laredo. I replaced everything but the heater core and it still overheats. I even installed an electric fan because mine didn't come with one. I can't seem to find anyone to have an answer my problem either.
Adding on: I'm having the same problem. I spoke to my grandfather, who suspects the issue is because the coolant reservoir is so small. Right now, I'm having an issue where after a mile it starts to boil over. To the shop I go. Surprisingly enough my jeep came with an electric fan. But it only seems to run when the A/C is turned on. Bad thermostat maybe?
Wiki User
∙ 11y agoOverheating can be caused by anything that decreases the cooling system's ability to absorb, transport, and dissipate heat, such as a low coolant level, loss of coolant (through internal or external leaks), poor heat conductivity inside the engine because of accumulated mineral deposits in the water jackets or radiator, a defective thermostat that doesn't open, poor airflow through the radiator, a slipping fan clutch, an inoperative electric cooling fan, a collapsed lower radiator hose, an eroded or loose water pump impeller or even a defective radiator cap.
The cooling system is a group of related parts that depend on proper function from each of its component parts to keep the engine cool. Service the cooling system and replace any under-performing or suspected weak parts. Any component part of the cooling system that is not fully doing its job will stress the others and your cooling system will overheat. The most important maintenance item is to flush and refill the coolant periodically. Coolant should be replaced every 36,000 miles or every three years. Anti-freeze has a number of additives that are designed to prevent corrosion in the cooling system, but they have a limited life span. The corrosion causes scale that eventually builds up and begins to clog the thin flat tubes in the radiator and heater core, causing the engine to eventually overheat.
Wiki User
∙ 12y agoLow coolant, inoperative radiator fan, malfunctioning water pump, slipping belt, stuck thermostat, etc.
Low coolant, inoperative radiator fan, malfunctioning water pump, slipping belt, stuck thermostat, etc.
Wiki User
∙ 16y agocould be many things: no coolant / coolant leak thermostat stuck closed air bubles after coolant change fan(s) or fan switches broken excesive load on engine (towing)
Wiki User
∙ 14y agoThis is usually caused by a stuck thermostat, or low coolant, take the cap off your radiator and fill it up (make sure the jeep is NOT hot, otherwise, the cap will pop off!)
Wiki User
∙ 12y agoLow coolant, inoperative radiator fan, malfunctioning water pump, slipping belt, stuck thermostat, etc.
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What would cause a 1994 Jeep Grand Cherokee Laredo transmission to overheat?
Pinched or blocked transmission cooling lines
Will a leaking heater core cause your car to overheat?
A leaking heater core will cause the engine to overheat because the coolant is leaking out.
Why does 2000 jeep run hot at idle?
A lack of water in your cooling system will cause your 2002 Pontiac Sunfire to overheat. A malfunctioning thermostat can also cause it to overheat.
What cause the Moonroof on 95 Jeep Grand Cherokee to malfunction?
This is a tough one to know for sure. I would recommend you take your Jeep to someone that repairs power windows.
What would cause a screeching sound in a 2000 Jeep Cherokee Laredo when it is put in park?
Loose or worn out serpentine belt.
What would cause a 1994 Jeep Grand Cherokee Laredo transmission to overheat?
Pinched or blocked transmission cooling lines
What would cause a 92 jeep cherokee 4.0L to overheat?
Blocked radiator, low on coolant, stuck thermostat, air in cooling system
Why would my 1992 Jeep Wrangler 2.4 Liter Overheat?
There are a few reasons why a 1992 Jeep Wrangler 2.4 liter would overheat. Some of the reasons are low antifreeze levels, radiator leaks, or fan malfunction.
What would cause a Jeep Wrangler to overheat?
Numerous possible reasons - low coolant, defective radiator, leaky hoses, bad thermostat, blown head gasket... take your pick
What would cause a Kia Sephia to overheat?
Too high a temperature
Why would a 1998 jeep Cherokee sport lose power steering and overheat?
Sounds like you belt came off.
Would blown head gaskets cause your vehicle to overheat as soon as you drive it?
it is possible for heat from combustion to cause an engine to overheat quickly depending on where the gasket is blown, but i would look for a lack of coolant circulation first. if your coolant is not getting out of the motor and into the radiator it will overheat very quickly.
Could a 1998 Jeep Grand Cherokee overheat when it as a electric fan?
Yes. There could be several reasons for engine to overheat.
Can a leak in the Thermostat housing in a 2006 Dodge Stratus cause the vehicle to overheat?
Any coolant leak can cause an overheat.Any coolant leak can cause an overheat.
What would cause a 240 ford motor to overheat?
A stuck or incorrectly installed thermostat.
Why would the alternator over heat the car?
It will not cause the engine to overheat. You have another problem.
What will happen if the engine fan does not work on a 2002 Jeep Liberty?
If you do not get the engine fan fixed, you will suffer overheating problems. In the summer, should you take it on long drives, the Jeep will overheat, most likely causing gasket damage to either the valve cover gasket, head gasket, or oil pan gasket. It can also damage the hoses, the connection for the hoses, the thermostat gasket, the thermostat; And that's just for the cooling system. If you allow your vehicle to overheat, you can cause severe internal damage, the worst of which would cause you to have to buy a new engine.
