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How about thermostat & radiator?
In what conditions is the engine heating up? If it's when your idling stoplights or stuck in traffic, that's fine. If the temperature is rising above 100 while you are driving along that is an indication that something is not quite right. On a hot summer day sitting at idle in traffic, the engine will quickly heat up to 105C, as long as your aux fans kick on to bring temperature down, this is normal operation of the engine. The fan clutch also engages at around 85-90C to help with keeping engine temperature in check. Anything over 115C should never be observed in normal running. Any measurable time at 120C will pop the head gasket most likely.
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