Question about 1989 Jeep Cherokee

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1989 jeep laredo overheating

Changed thermostat twice, and checked if theres any clogs in hoses. Still have no clue as to why its still over heating. Help!

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Providing that you do not have a head gasket problem (usually identified by either coolant in engine oil or excessive white smoke sometimes accompanied by actual water from tail pipe, I've found that the radiators in these puppies are way undersized. Added to that, Beginning in the 70's, the manufacturers began to "lighten" cast iron engine blocks by eliminating some of the zinc from the alloy mixture. Zinc is also a binding agent as well as protection against rust.Rust gets into the radiator passages and plugs them up. During a normal flush, (in car) the rust is too heavy to come out of the tanks. Therefore if you remove the radiator and back-flush it, hold it first with one tank down, then with the other tank down, permitting the flush water to escape through the hose connection at whichever tank is down, then filling the radiator with clr household calcium rust and lime remover while standing upright with lower hose connection plugged for about an hour, then re-flushing as above, 90% of the time it will restore function.
Note:before replacing radiator take therm out, run strong flow of hose water through engine to remove as much junk as you can from internals.

Posted on Dec 24, 2008

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Have the cooling system flushed and radiator roded out.

Posted on Dec 14, 2008

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