2000 5.3 overheating - The 1947 - Present Chevrolet & GMC Truck Message Board Network

maynardtruckin · 07-01-2012, 02:59 PM

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

. I also have tested for a blown head gasket and it is fine. Any help please before I use some DuPont wrenches on it.

**truckdude239** · 07-02-2012, 07:19 AM

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

maynardtruckin · 07-02-2012, 10:56 AM

I have.

**truckdude239** · 07-02-2012, 12:21 PM

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

maynardtruckin · 07-02-2012, 02:24 PM

Quote:

Originally Posted by truckdude239

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

Its a OE radiator.

**truckdude239** · 07-02-2012, 10:51 PM

Okay thats weird how doez it run? Only other thing i can thing of is the timing is off?:
Posted via Mobile Device

maynardtruckin · 07-02-2012, 11:07 PM

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.

bbchevy · 08-27-2012, 09:39 PM

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
Posted via Mobile Device

maynardtruckin · 08-27-2012, 10:26 PM

Quote:

Originally Posted by bbchevy

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
Posted via Mobile Device

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.

07-01-2012, 02:59 PM	#1
maynardtruckin Registered User Join Date: Jan 2011 Location: Falcon \ Colorado Posts: 193	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 . I also have tested for a blown head gasket and it is fine. Any help please before I use some DuPont wrenches on it. __________________ Chris 67 c10 swb build in progress 70 c10 lwb driver pending parts for drastic overhaul 70 c20 lwb parts truck for above mentioned drastic overhaul 71 k20 lwb building for off road use and towing

07-02-2012, 07:19 AM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: 2000 5.3 overheating you need to verify it running hot useing an ir heat gun or mechanical gague __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

07-02-2012, 10:56 AM	#3
maynardtruckin Registered User Join Date: Jan 2011 Location: Falcon \ Colorado Posts: 193	Re: 2000 5.3 overheating I have. __________________ Chris 67 c10 swb build in progress 70 c10 lwb driver pending parts for drastic overhaul 70 c20 lwb parts truck for above mentioned drastic overhaul 71 k20 lwb building for off road use and towing

07-02-2012, 12:21 PM	#4
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	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 __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

07-02-2012, 10:51 PM	#6
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: 2000 5.3 overheating Okay thats weird how doez it run? Only other thing i can thing of is the timing is off?: Posted via Mobile Device __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

07-02-2012, 11:07 PM	#7
maynardtruckin Registered User Join Date: Jan 2011 Location: Falcon \ Colorado Posts: 193	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. __________________ Chris 67 c10 swb build in progress 70 c10 lwb driver pending parts for drastic overhaul 70 c20 lwb parts truck for above mentioned drastic overhaul 71 k20 lwb building for off road use and towing

08-27-2012, 09:39 PM	#8
bbchevy 87 Wanna Be K30 Join Date: May 2003 Location: long island, new york Posts: 218	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 Posted via Mobile Device __________________ Was: 1987 V10 Silverado TBI 350/700R4/208 with 3.42 gears Is: A wanna be K30 330hp 350/465/205/D60/14FF with 3.73 hydroboost, 4 Core radiator, electric fans, Centerforce Duel Friction, Locker, 6inch Soft ride lift, etc....



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