My 2008 Silverado is running hot up to 260 degrees, my check engine light is on, the code is p1258, I'm getting lights such as engine hot a/c turned off, engine hot idle engine, change engine oil, service stabiltrac, service traction control, and engine power reduced, both fans are running and have both high and low speeds, I lose my heater when the engine gets hot, I replaced the thermostat, replaced the ect sensor, both upper and lower radiator hoses are hot. Any idea whats wrong here?

 

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Do you have a leak in the coolant system? Is the coolant level low? Could be the water pump or a clogged radiator. Really need more information.