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01-14-2018, 11:29 PM | #1 |
Addicted to Rust
Join Date: Dec 2009
Location: Abbeville SC
Posts: 1,030
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Sigh, it's losing coolant.
The 02 5.3 in my crew is suddenly using coolant. Replaced the coolant reservoir, the old one cracked. Coolant was down in the rad. Added almost a gallon, it's been a week and it was low again. Who want's to bet on a cracked head? 8622 castings checked 40k miles ago at the machine shop.
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Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public. |
01-14-2018, 11:52 PM | #2 |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: Sigh, it's losing coolant.
Are you burning it up, or losing it into the oil?
Check your freeze plugs!
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01-15-2018, 08:04 AM | #3 |
Addicted to Rust
Join Date: Dec 2009
Location: Abbeville SC
Posts: 1,030
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Re: Sigh, it's losing coolant.
None in the oil, I changed it to check, it was due any way, and no external signs. Valve covers will come off next.
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Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public. |
01-15-2018, 12:04 AM | #4 |
Registered User
Join Date: Dec 2013
Location: Dunwoody,Ga
Posts: 443
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Re: Sigh, it's losing coolant.
I had this trouble. Losing coolant and couldn't find it - not in oil. Ran compression check which was OK.
Turned out to be crack or hole on one side above coolant level. When coolant expanded, it would leak out. Of course when the coolant expanded it was very hot and it would evaporate leaving no sign. Found it by buying dye kit from Summit. |
01-15-2018, 07:44 AM | #5 |
Registered User
Join Date: Apr 2010
Location: Guntersville Alabama
Posts: 1,073
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Re: Sigh, it's losing coolant.
If you suspect the heads , I would take the time and remove the valve covers and have a look . This takes little time to do and will answer your question if it is indeed a cracked head . There will be no question and is very evident if it is cracked ( white sludge ) . Once it gets bad enough to start to see it on the dip stick or the oil fill cap it may be to late . Possibly gotten in the bearings by that time .
A dye could be used to check for a external leak . If none most likely internal . Dont keep driving it if so . It dont get better and could need a new engine if it gets into the bearings . More money . If this is what it is get a set of 799 or 243 heads . Better performance and does not have the crack problem . |
01-15-2018, 01:22 PM | #6 |
Senior Member
Join Date: Jan 2009
Location: huntington beach california
Posts: 976
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Re: Sigh, it's losing coolant.
Be sure to check your radiator cap. Sometimes they get old and stop holding pressure and release coolant.
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