Question about Jeep Cherokee

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Have 1991 jeep cherokee,it runs hot about 240and with the ac on runs about 260.and when idiling with no ac runs about 260.i have replaced head gasket,fan clutch, radiator, waterpump,rad cap,theromstat and still have the same problem.i use to have a 5 speed in my jeep but have a automatic trans put in also they replaced wiring harness and the ecu box.could the computor have anything to do with it overheating

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  • kiddanno May 17, 2009

    radiator is brand new not clogged.how do you burp the air out of the cooling system

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Hi

The radiator may be clogged preventing water flow into the engine. With the engine cold, remove the radiator cap. Start the engine and let it warm up to the point where it should open the thermostat. Observe the flow of water in the radiator. If you can't see the water moving, the flow is being impeded somehow. Also suspect the coolant temperature sensor (located next to the thermostat housing).

You may have an air pocket in the coolant lines preventing proper flow of the coolant, be sure to flush the system thoroughly to remove any airpockets. There is a bolt on the thermostat housing which you can remove (when cool) that by-passes the thermostat, allowing you to fill coolant. Use a small funnel and fill to top, then replace the bolt. This will allow the coolant in the block to reach water pump, heating thermostat, and circulating the coolant through radiator, etc.

Also, remove the overflow bottle, and using a stiff wire (coat hanger in my case) make sure the pipe connecting the bottle to the system is clear.


Please do accept this solution and revert for further assistance.

Thanks
Rylee

Posted on May 17, 2009

  • Rylee Smith
    Rylee Smith May 18, 2009

    You can flush out the whole system to remove any captured air which is preventing proper flow of coolant. You can do it by by either using a pressurized tool for filling it or along the top of the intake or there is a coolant line that has a *bleed screw* that can be opened while filling it till coolant comes out of the hole then close it up. The bleed valve is near the top radiator hose. Be careful, as some hot coolant will also come out, and you can be burnt.



    You can do it by following this procedure--



    Let your engine cool down. Nothing stings more than skin-piercing fluids or hot engine parts. Once the engine is cool enough raise and support vehicle. Place a safety stand under the raised part of the vehicle. A good idea in case the vehicle slips off of the jack. Remove radiator cap. Find the radiator drain plug, usually somewhere at the bottom or side, and place a drain pan under it. Open it up and let her drain out.

    Make sure you have a couple of extra pails handy when draining coolant. The drains can be located in areas that make it easy for the fluid to run down other parts of the car and drip where you don’t expect it. If it does get on the ground, use the oil absorbent to control and soak up fluids.

    REMEMBER: Coolant smells sweet to animals, but it’s very poisonous to them. Always clean up and dispose of fluids and used absorbent in accordance with your local laws.

    Once the coolant has drained, close the radiator drain and fill the cooling system with tap water. Reinstall the radiator cap, and run the engine until it reaches normal operating temperature. This gets the engine warm enough for the thermostat to open up and circulate water through the motor. Allow the engine to cool again and then repeat the draining process. Once the water has drained, close the radiator drain again. Refill the system with tap water and add the flushing chemicals. Reinstall the radiator cap, and run the engine as long as it calls for on the flushing chemical instructions. Allow the engine to cool and repeat the draining process. Close the radiator drain and fill the system with ONLY distilled water. Tap water can leave behind deposits that can harm your cooling system if not cleared out. Start the engine and allow the distilled water to circulate. With engine still running, remove the radiator drain, allowing the distilled water to drain out, while you add fresh distilled water into the radiator fill hole. Once the water draining from the radiator looks clear, turn off the engine and allow the rest of the water to drain out. Close the radiator drain. Slowly fill the cooling system with a mix of distilled water and fresh coolant (normally a 50/50 mix will do, but check your owners manual for the right water to coolant mix for your vehicle).



    Once the system is full, reinstall the radiator cap. Your system has been flushed.





    Please do accept this solution and revert for further assistance.

    Thanks
    Rylee


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