98 cherokee sport, 4.0, it's overheated

Sounds like your thermostat isn't opening properly

sounds like you have blown the internal heater matrix and the thermostat is not working or is blocked. you are going to need a new matrix and thermostat and a bloody good flush out of the system just in case there is something in the system means taking off the rad hoses flush them out from both ends. and doing the same to the engine. replacing the matrix as its not going to be able to fix it if its shooting water out of the vents change the thermostat check pipes for damage.

It could be the fan clutch not engaging which will not pull air through the radiator, it may still appear to be spinning but it could not be at the correct RPM for adequate cooling. Hope that helps.

Hello, sandyburgess and thank you for asking your question on Fixya!

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Thanks for the vote, and good luck!

If the fan is coming on,then the radiator,is bad,or the engine ,has a crack between the valves,in the head.

I think you may need a new radiator core.Flushing can only do so much and if the core is badly blocked no ammount of flushing will solve the problem. You could also chech there is no air in the system by undoing one of the heater hoses on the engine. Make sure there is no problem with the bellts and the water pump is spinning. Also check the water pump for any leaks or wobble on the shaft. If the impeller is bady corroded you can have heating problems.

How do you know the thermostat is ok? If in doubt replace it. Water pumps are a even bigger what if. Did he do a radiator flush? Cooling system flush of the engine? Cooling fans come on at what temp and go off when? Replace the engine temperature sensor? 6 years old is bound to have sensors and such go bad.

The rust is probably in the engine. There are many little pockets, water ways, water jackets (around the cylinders), etc, so getting all the rust out without dunking the block and heads in a cleaning tank is about imposible. I would recommend giving it really good flush every 4 to 6 months. I would try flushing the radiator before replacing it because it is probably not rusted, even though it is full of gunk.

well without the vehicle in front of me I can mention a few things for you to check
1) possible water pump impeller is rotted away or cracked,
2)check for correct belt routing cause if its wrong the water pump will spin backwards??it happens
3)are you seeing and hearing it overheat ?or are you looking at the guage?may be a faulty sender
4)check electric fan for operation
5)Ive even seen people put the mechanical fan on backwards after they replaced things.
6)grab the fan blades(with enging OFF)that are attached to water pump and see if there is any excessive slop?
hope something helps have a good day DB