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Why won't my 1999 jeep Cherokee limited V8 4.7 liter stop overheating?

I have changed thermostat,housing unit, radiator cap, hoses and bypassed my heater core. The fluids are full and my fan is working.

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  • 52 Answers

The 1999 and 2000 4.7 had marginal cooling systems. Mainly the fans.
1) are you overheating when in traffic (moving slowly). Look for fan issues - broken plastic covers etc.
2) If you are overheating while moving down the highway. Check the pressure rating of the cap. While you are at it, pressure test whole system.
3) If you have a lot of miles on the 4.7 (150K+) I personally suspect head gasket issues. If you aren't replacing the antifreeze on the recommended schedule, you could have corrosion issues.

BTW, severe overheat on a 4.7 will kill the motor quickly. Keep an eye on that water level. Those aluminum heads are notorious for dropping a valve seat and ruining the whole motor.

Its a good motor, just keep up with the maintenance and use synthetic oils.

Posted on Apr 09, 2015

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A possibility is the water pump. This is what circulates the water through the engine and back to the radiator for cooling. Water pumps consist of several vanes attached to a rotating shaft. If a few vanes are broken, you'll get reduced water circulation, causing overheating.

Posted on Apr 08, 2015

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  • tyler mcglaughlin Apr 08, 2015

    How do u tell if it stops working

  • tyler mcglaughlin Apr 08, 2015

    How do u tell if the water pump stops working

  • Fickster Apr 08, 2015

    To tell if the water pump is working, remove the radiator cap on a cold engine and start the car. Have a pan under the radiator to catch the coolant that will flow when the engine warms to the point where the thermostat opens. When this happens, coolant should flow out of the top of the radiator. That indicates the water pump is working. Be sure to replace the radiator cap before turning off the engine after this test, or you'll have a small geyser of coolant escaping. You should also flush the radiator if you haven't and also use compressed air to clean the external radiator fins. Finally, if someone has used an additive like stop-leak in the cooling system, your radiator may be plugged. Have it pressure tested.

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Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
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SOURCE: engine block does not heat up

Therefore, the fan clutch is bad and should be replaced... I don't remember if I said or thought this in the beginning, or if I just thought you had checked it. Anyhow, change it and you're done!!!

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SOURCE: 1999 ford taurus no heat

Is the blower motor working? If not that is what it is. If it is working then check heater coil out, Could be bad heater coil.

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SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat

Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.

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If it is fogging your windows, you have a leaking heater core. Dash removal is required to fix it.

Posted on Jan 11, 2011

Testimonial: "great advice,,but I am not losing antifreeze from my cooling system,"

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1999 jeep grand cherokee overheating...


You need to fill your antifreeze with the truck running and your heat on. You leave off the radiator cap and let the truck warm up. The cap is left off to bleed air out of the system. Once the truck reaches temp for the thermostat to open, your fluid level should drop about 3/4 gallon. Give that a try and see what happens.

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How do I install a thermostat on a 1999 jeep grand cherokee v8 4.7 engine


Hello,

To install a thermostat on Your 1999 grand cherokee jeep. You will be needing these instruments, Container, Clamp tool or vise-grip pliers, Thermostat and gasket, 10mm socket or wrench, Razor blade, Flathead screwdriver (if necessary). Then You carefully follow the steps below:
  1. Open drain **** on the radiator to drain the coolant from your Jeep Grand Cherokee. This drain **** is located on the lower right side facing the rear of your Cherokee. Use a seal able container and reuse the coolant if it is relatively new and clean.
  2. Follow the upper radiator hose to the point where it meets the thermostat housing. The thermostat is located inside the housing. Use a clamp tool or vise-grip pliers to loosen the clamp holding the hose to the housing. Work the end of the radiator hose free of the thermostat housing.
  3. Remove two bolts holding on the thermostat housing cover. Pull off the cover. Take note of the position of the old thermostat. Remove and install the new thermostat in exactly the same position.
  4. Scrape off residue of the old thermostat gasket from the inside of the thermostat housing cover using a razor blade. Avoid getting any debris inside the thermostat housing.
  5. Install the new gasket. Reattach the thermostat housing cover and radiator hose. Start your Jeep Cherokee and run the heater on high. Allow the engine to warm up. Check for leaks.
Those are the steps to follow to install your thermostat.
Hope this was helpful. Thank You for using fixya!!!

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1 Answer

Engine was overheating need to know if a tube is supposed to go from the radiator to the engine coolant


you should have one upper radiator hose, one lower radiator hose, a small diameter hose that runs over the top of your radiator starting from the radiator cap going left across the top and then to your coolant reservoir and another from your thermostat housing to the firewall for the heater core the upper radiator hose should also go to your thermostat housing. the lower radiator hose goes to your water pump This hose routing is only for a 4 liter straight 6 I'm not sure about the V8 or the 2.5 liter motors

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The car keep overheating, there is water in the radiator and the resevior tank 2000 jeep grand cherokee i check the oil their is no water found in the oil the water from both unit stays full


Sounds like your thermostat is stuck closed. Shouldn't be more than a $20 part from autozone and is simple to replace. Follow your top radiator hose to the motor and it will connect to your thermostat housing. Disconnect the hose (antifreeze will run out) unbolt the housing, and replace the old thermostat. Refill radiator and bleed the system.

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1 Answer

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