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07-07-2014, 04:28 PM
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#1 |
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Registered User
Join Date: Mar 2010
Location: Deep East TEXAS
Posts: 453
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2000 GMC running hot?
My dad has a 2000 GMC 1/2 ton ext cab P/U w the small V8(size escapes me right now). Last summer he noticed when he towed it would run a little hot. He was convinced it was the transmission bc the truck now has 150,000 + miles on so he had it rebuilt. That did not fix this problem so he went ahead and replaced the water pump but this did nothing either. The truck is not burning oil, using any water ect. Runs perfect but you can put an empty 20 ft HD low boy behind it and it will climb to about 235 or so. Never overheats. Do these lil motors just run hot under a load?
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Preserving American History one truck at a time. |
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07-07-2014, 10:21 PM
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#2 |
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Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 2000 GMC running hot?
Radiator half clogged either internal or external (Between the condenser & radiator with debris), Seen it many times. If you drove it up to 90mph empty you would get the same result.
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07-08-2014, 10:20 AM
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#3 |
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Registered User
Join Date: Mar 2010
Location: Deep East TEXAS
Posts: 453
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Re: 2000 GMC running hot?
ok Thanks, I will look into that.
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Preserving American History one truck at a time. |
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07-08-2014, 11:27 AM
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#4 |
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Beer Drink'n Knuckle Dragger
Join Date: Mar 2010
Location: Eatonville, WA
Posts: 493
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Re: 2000 GMC running hot?
If that doesn't work, try a flush and inspect the fluids...also it's the 4.8L v8 is Chevy's small vortec V8
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 GOD BLESS MY BROTHERS & SISTERS THAT SERVE WITH US- 67 GMC Long-Wide 350/SM420 My BACON Wrapped Meatloaf Recipe |
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07-08-2014, 02:30 PM
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#5 |
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Registered User
Join Date: Mar 2010
Location: Deep East TEXAS
Posts: 453
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Re: 2000 GMC running hot?
That's the motor. well dad said he replaced the radiator at the end of last summer when he changed the water pump. So he's going to look for any external blockage. I suppose it could be clogged ports in the heads or engine as well or the temp sending unit isn't accurate???
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Preserving American History one truck at a time. |
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08-05-2014, 10:29 PM
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#6 |
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87 Wanna Be K30
Join Date: May 2003
Location: long island, new york
Posts: 218
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Re: 2000 GMC running hot?
If you haven't figured it out yet......
Maybe check into the fan clutch. Might not me engaging when the temperature increases. Sometimes they will spin with very little resistance when the engine is off. The fan being incapable of pulling a higher volume of air as temp increases would cause your symptoms. Just a thought
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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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08-06-2014, 10:12 AM
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#7 |
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Registered User
Join Date: Mar 2010
Location: Deep East TEXAS
Posts: 453
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Re: 2000 GMC running hot?
Yea I appreciate but that was one of the first things we looked at.
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Preserving American History one truck at a time. |
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08-17-2014, 09:48 AM
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#8 |
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Registered User
Join Date: Jul 2007
Location: Odessa, Tx
Posts: 85
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Re: 2000 GMC running hot?
I would try tunning of the ECM. Have them Change some stuff around like transmission oil pressure and shift points and fueling. I would suggest it is the torque converter. Was it replaced with transmission? Hope this helps.
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My smart phone makes me look dumb when I types. 
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08-17-2014, 03:39 PM
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#9 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,217
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Re: 2000 GMC running hot?
my buddy's s10 does this with the 4.3 l v6 towin an empty 6x12 trailer we've havent been able to figure ti out We put a new denso/ ac/deco raditor in it new water pump New gm thermostat, new gm radiator cap, end up replaceing the motor due to blown head gasket haven;t had an issues since
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