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Dan, Technician
Category: Chevy
Satisfied Customers: 23487
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Chevrolet Silverado 1500 2003 silverado low coolant warning

Resolved Question:

2003 silverado low coolant warning comes on for a second,added about a 3/4 a gal antifreeze and water.have noticed i can hear coolant circulating on first start.180,000 miles no water in oil no visable leak what gives.
Submitted: 5 years ago.
Category: Chevy
Expert:  Dan replied 5 years ago.

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Does low coolant warning come on even when coolant level is full?

Customer: replied 5 years ago.

no came on once hot engine ,went off in 10 seconds added coolant right away truck runs fine no issues

Expert:  Dan replied 5 years ago.
Heat works good? Does vehicle ever run hot? So the overflow tank was a little low on coolant and adding coolant has kept the light off? Thanks.
Customer: replied 5 years ago.

heat is fine ,low speed relay recently went .no more warning from command system



Expert:  Dan replied 5 years ago.
Ok, if the coolant was low then you have a coolant leak either internal such as headgaskets or intake gasket or external such as radiator, hose, ect....If its a small leak then watching fluid and adding once in awhile would least until leak gets worse....To fix you will need to connect a cooling system pressure tester and pressurize system while looking for external leaks...If none are found then you likely have a intake gasket leaking considering you have good heat and it doesnt run hot. Let me know fi you have questions, thanks.
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