2000 5.3 overheating
 

I have 2000 chevy Silverado 1500 4x4 with the 5.3 and it is overheating. When it first started I replaced the thermostat, then the water pump, then the radiator, and the clutch fan and it continues to over heat. With it still overheating I thought that I might have had a bad thermostat, or water pump so I changed them again as well as the sending unit, but alas it still is running hot :devil:. I also have tested for a blown head gasket and it is fine. Any help please before I use some DuPont wrenches on it.

Re: 2000 5.3 overheating
 

you need to verify it running hot useing an ir heat gun or mechanical gague

Re: 2000 5.3 overheating
 

I have.

Re: 2000 5.3 overheating
 

what brand is the radiator? my friends s-10 pickup over heated allt he time and his problem was the aftermarket radiator he installed a gm dephi raditor solved his problem not to say its the same thing as yours

Re: 2000 5.3 overheating
 

Its a OE radiator.

Re: 2000 5.3 overheating
 

Okay thats weird how doez it run? Only other thing i can thing of is the timing is off?:
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Re: 2000 5.3 overheating
 

It runs great but I did notice that the oil pressure has started to fluctuate and it popped a code PO332 which is a low voltage out put on a knock sensor.

Re: 2000 5.3 overheating
 

I know my 5.3 was a little clogged up from dexcool. There was just a bunch of restriction. I bought the best coolant flush I could and it actually made it stop. It used to overheat with the a/c on.

How is yours overheating. Under what conditions? How many miles are on the truck? Does the a/c have clogged fins in front of the radiator blocking air flow?

Does the temp just keep climbing when you start the truck of just spike when you least expect it? Or under a load? Only on a hot day?

-Scott
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Re: 2000 5.3 overheating
 

It runs fine most of the time till you hook up a trailer and drive. trailer can be empty or full does not matter but if you start to clime even the slightest hill the temp starts to go up slowly but if you let off it cools down. It happens on cold and hot days. As for mileage it is 180,000. NO clogged fines on the ac, or radiator.