1990 Cherokee overheating need help

I have a 1990 Cherokee 4.0L it runs good but over heats when you get on the gas . I can drive it 100miles and it will run cool 195 are so . But if I get into the gas it overheats . It blew of the top hose . and you can't cool it down . If I shut it down for about 10-15 min its Ok . I have replaced the water pump , thermostat, all hoses . It has a close system the tank dose not leak . There is no water in the oil or oil in the water , No water in the exhaust. :banghead: I don,t know what to do next . Thanks for any help. Kenny

Welcome to the forum!

It sounds like the only thing left that has not been changed is the radiator. If it is the original radiator, they are known to be very THIN, and any flow restriction would be a problem.

I believe there is a thread at the top of this forum that tells about all sorts of radiator issues. Check it out.

Take Care,

Yup, sounds like radiator to me also. I'd bet that if you don't change it now, it'll be overheating next summer.

Sometimes when you get on the gas the clutch on the cooling fan will disengage - thus lowering the flow of are into the radiator. You can conduct a radiator flushing and check the fan clutch (how easy does the fan spin while the engine is off. It should have a small amount of resistance). When I had my 88 Cherokee i changed out my radiator with a 1992 (and above) era radiator, which changes it to an open cooling system, and installed an electric fan. It's a simple change and takes about 4-5 hours.

Ditch the POS pressure bottle, first off. Get a 92+ heater control valve(cheap), and an apropriate filler neck with a pressure cap(wicked cheap) from Jeg's. Splice the filler neck into the upper radiator hose. After disconnecting your pressure bottle and punting it into your back yard, cut the old heater control valve out and swap the new one in. New hose in this whole process is recommended. Fill with coolant/h2o mix and wave goodbye to your old junk-pile cooling system.

Thanks for the Help

Something else to think about.....Swap from the closed system to the open...
That way you elemenate the pressure bottle and the hose mess that is attached to the bottle.....
The swap is a no brainer....rad is the same width.. length...height....no mods to do and you get a real radiator cap.....some where I gots the model # for the rad....lemmee see iffin I can find it then I'll post up the parts needed to do the swap.....
Also make sure the waterpump is in good shape ...if you have any doubts...change it also...
Radiators and water pumps usually have a lifetime warranty....trust me that pays off in the long run..............

:grinyes: :grinyes: :grinyes: :grinyes: New radiator fixed it :rofl: I put one in for a 1992 . It cost about $ 250 for everything . Thanks for the help . :iceslolan :iceslolan