parks450

iTrader: (17)

I have a 2003 2500hd 6.0l gas and it overheats when your sitting still. Once you start moving it cools down. Once your stopped though the temp climbs quickly. The water pump fan kicks on only sometimes. Could it be the water pump or possibly a plugged radiator? This is my DD so any help is appreciated. Thanks

ULTIMATEORANGESS

iTrader: (4)

tstat possibly.

parks450

iTrader: (17)

I thought maybe the tstat at first but it would stay hot since it wouldnt be opening. Im thinking water pump but not sure.

ULTIMATEORANGESS

iTrader: (4)

i had a car that would run hot while it was sitting and hard acceleration but normal cruising it was fine.


it was my tstat.


any smoke coming out of your exhaust?

parks450

iTrader: (17)

Not that I have noticed

ULTIMATEORANGESS

iTrader: (4)

hows your coolant level?

parks450

iTrader: (17)

Besides it draining from being super hot and refilling it its good. It hit 250 at one point luckily I was almost home I didnt have a choice I wasnt able to stop. i havent heard of the water pumps going out on these trucks much at all.

ULTIMATEORANGESS

iTrader: (4)

water pumps tend to make noise when theyre going.

parks450

iTrader: (17)

When the fan kicks on which is only sometimes it makes a whining noise.

ULTIMATEORANGESS

iTrader: (4)

its been awhile but when water pumps are going it sounds like marbles.


im sure you checked for leaks?

1999Z28

Maybe the fan clutch.

They didn't start with electric fans in trucks til like 05, I can't recall if they even put them in 2500s

parks450

iTrader: (17)

Yea no leaks. Im pretty sure its the the fan clutch going out. But it still shouldnt overheat. Im gona replace the tstat tomorrow and see if that helps.

LS6427

iTrader: (2)

Its not the water pump. If that stops pumping water you overheat right into the red.....whether sitting still or doing 70mph.....period.

It could be a partially opening t-stat however......I just had one of those little gems 2 weeks ago. Sucker was taking forever to open and when it did, it would not open fully. BUT...that would cause overheating when stopped or on the highway cruising.

Most likely its the fans, thats what keeps you cool when stopped or in stop-and-go traffic.

*****Is this happening with and without the A/C "on"....?

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