Question about 2002 Jeep Wrangler

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2002 jeep wrangler OVER HEATING

Jeep is over heating when you drive it,also have no heat.I replaced the thermostat and radiator and I still have the same problem What could be the problem? I also have new antifreeze in it 50/50 the yellow colored antifreeze made for gm's/dodge. Please help

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  • kjbd Mar 02, 2009

    i was told i could have a air pocket in the system .How would i get the air pocket out???? Also after running motor radiator gets real hot bottom hose on radiator is cold Please help

  • Chuck May 11, 2010

    if you ran the car while filling the radiator not the reservoir can eliminate 95% of the air. Now after your all filled run car until fans come on. Now if you can locate a temperature coolant sensor on the head and just crack it loose (BEING CAREFUL NOT TO BURN YOUR SELF!!! USE A RAG TOO). Now just turn a tiny amount until air comes out, now let it do this untill coolant comes out. Just make sure to pick the highest located sensor. This will alleviate the air pockets. But i really dont think you have that big of an air pocket where the whole top radiator hose is staying cold. i really believe it is the thermostat is in wrong that is why i say just remove it for test purposes. when you flushed your coolant did you leave your heater controls on hot? you are supposed to so the flushing agent can clean out the heater core. Also when you fill the system with this 50/50 mix you are supposed to fill it with the controls on high heat. Also like i said before i like to fill it to the top (with motor off) then when it reaches top start the motor and continue to fill the radiator until it is totally full. now put on radiator cap and fill reservoir. let me know how you made out.

  • Chuck May 11, 2010

    if you can take out the thermostat and run it without the thermostat (this is for test purposes only. it will not harm your car). now if your heat comes on and engine goes to normal that means the thermostat was put in backwards which is very easy to do just pay close attention to which direction you put the dongle on thermostat. if this does not solve problem there is a clog somewhere and maybe a professional cleaning might be needed becasue they can use the pressure type cleaning systems which will blow out clogs. hope this helps. also make sure all caps and reservoir caps are tight.



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Run it for a while and check the two heater hoses to the fire wall for the heater core. Turn the heat inside on low and floor. The hoses (when the jeep is hot) should be about the same temp. One will be slightly cooler than the other one. If this is not the case and one is much colder than the other you have a plugged heater core. Mark the cool hose let the jeep completely cool remove the cold hose and the hot hose use a garden hose to flush the core in direction of the cold side to hot side. If this is not it you have a air pocket in the system or your blend doors in the air box under your dash are broke.

Posted on Mar 01, 2009


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