Jeep runs hot water pump nad and new. Heater only works every now and then. Jeep has 135,000 miles. When the heater works the jeep runs at normal temp.
Your heater problem, is the clue here...generally when the heater stops working like that it's due to compression gasses entering the cooling system, usually through the cylinder head gasket. The core is above the engine, so those gasses accumulate there. Since you have already replaced the other components in the system, Id have a hydrocarbon test done to verify that. I am assuming though that the radiator electric fan is coming on. If it does not, in extreme cases, steam can do the same thing. Oil in the coolant, coolant in the oil or white smoke from the tail pipe are also symptoms of a head gasket though you can have one, all or none of those symptoms, depending on where the failure is exactly on the gasket itself. (why that test is important)
Did you change the thermostat ?
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New thermostat rad and water pump.
what is a nad and new?
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