Hi everybody
I have a problem with the cooling system in a 94 jeep grand cherokee ltd ,inline 6 cylinder.4.0liter... it overheats bad now when I crank the heat on there will be no problem but when the heat is not on it just overheats very quick making the anti freeze flow back to the reservoir and eventually errupt fom there..
Now I have changed the water pump and the thermostat (many times) is there anything that I'm missing or something that I can do to solve this problem?. if so so so please help me out any ideas or suggestions,answers would be awesome thanks!

Is your radiator clogged? I have the same year model vehicle so I know all about this particular car.

I'm not sure... wat do u suggest I do

Have a mechanic see if the radiator is clogged. Since you changed the other stuff and it didn't help the overheating problem, there is only one place left (logically that is) and that would be your radiator. If that's the original one, then it's probably time for a new one. The newer radiators in cars like ours don't last as long as radiators in cars from the 1970's or 1980's. I've had mine since 12/02 and am the second owner. I had to change out my radiator and water pump about 4 years ago.

Do u think a flush would work

Would a radiator flush work?

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Originally Posted by log

would a radiator flush work?

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A flush will only clean some of the gunk from the tubes that are already flowing.

If the radiator tubes are clogged, the flush and cleaners won't be able to to anything. The scales that build up in a radiator sometimes simply cannot be removed.
It would be best to replace the radiator and it's cap.

I agree with Capt Rich. If this was the original radiator, then it definitely needs changed out as the clog is beyond trying to goose out with any declogger stuff. The antifreeze must flow evenly and freely in the radiator or it will overheat.

K I will test out the radiator to see if it is clogged then have it replaced.. keep u guys posted... oh how much did it cost for the radiator twinkiedooter?

The cost depends on where you get it. I paid in the $300 range for a replacement one and installation of it about 4 years ago. I know it's pricey, but if you still have the original one in the car it definitely needs changed.

Hey twinkiedooter,well I have finally changed the radiator... this thing when taken out weighed 4 times the new radiaiotor lol cause all the garbage inside of it .anyway that was the problem.. also not to mention it became more fuel efficient the engine sounds a lot cleaner and accelerates a lot quicker.. thanx a million!!

log, be sure to use a 50/50 mixture of G-05 antifreeze and distilled water. The distilled water will prevent mineral buildup in your new radiator.