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My 2004 silverado overheats replaced all componets water pump,clutch fan, thermostat, flushed radiator, still overheating, I replaced the fan clutch with a flx-292 electric fan and still overheats. Do any of you have any suggestion of what might be the cause of this problem.

Thanks,
Cerros
Imperial Valley, Ca
[email protected]
 

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Have you pressure checked the system for leaks?
Are you getting antifreeze in the oil or oil in antifreeze?
After replacing the parts was the system properly refilled to prevent air bubbles, particularly in the heater core?
Is antifreeze flowing sufficiently while the engine is running to indicate no system blockages?
 

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After replacing the parts was the system properly refilled to prevent air bubbles, particularly in the heater core?
Is antifreeze flowing sufficiently while the engine is running to indicate no system blockages?
Good call! An air lock would definetly cause overheating...
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Head gasket?

Sounds like you've swapped everything else so I would test for combustion gas in the radiator. You can get a kit like the one from Lisle tools from NAPA or your local parts store. This will identify more serious trouble like a head gasket leak or cracked block/head.
 

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this may sound dumb, but what about the raditor cap? did you replace it? i seen many systems overheat due to this issue. the seal is bad and does not allow the system to prusure up some and overheat.......mike
 

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did you burp the system if its like the 99 i did my like the chilton manual says which i cant remember off the top of my head but you have to run it a few thousand rpm and let drop and then bring up again and let it drop then shut if off and burp the system then do it again and it worked fine my truck hasnt gone over since been fine.
 

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I agree - replace the radiator cap, too.

This is normally a closed system under pressure. The added pressure helps keep the fluid from boiling. Boiling means vapor in the system - vapor means hot spots and could mean starving water pump, too.

Besides, it's only $10 at the parts store.
 

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This is normally a closed system under pressure. The added pressure helps keep the fluid from boiling. Boiling means vapor in the system - vapor means hot spots and could mean starving water pump, too.

Besides, it's only $10 at the parts store.
assuming you found the problem! I suggest you try Water Wetter from Red Line. This stuff works amazingly! I have on my cooling system and it does work. I dropped around 25 degree!! make sure the ratio is 80% water and 20% anti freez.
 
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