Do a presure test on the radiator cap. The radiator cooling fan should be coming on regardless of heat up so listen for it to come on. If it isn't coming on, you need to unplug the coolant sensor by the top radiator hose at the engine block, then with key on, engine off, take a paper click and jump the connector in your hand. The fan should start at this point. If it doesn't you need to jump the fan with jumper wires from the battery by uplugging the connector at the fan and see if it will run. If it doesn't, you need to replace the fan. If all of this is working you need to have a presure test done on the cylinders by pulling all of the plugs. The pressures should be the same. If 2 cylinders beside each other is low, you most likely have a blown head gasket that will need to be replaced. Make sure you do the other test first and make sure that the radiator cap is sealing correctly.
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