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1991 GMC Suburban 2500 Question: why is air bubbling back through coolant resevoir



, 6.2L V8 Diesel, Waynesboro, VA, December 11, 2010, 08:45

air bubbles back through coolant resevoir constantly pushing coolant into the reservoir & not allowing it back into cooling system thus causing "low coolant" light to come on.this happened after an overheating episode when i noticed my temp go up to about 210 briefly. i immediately replaced thermostat & radiator which was leaking a little. the bubbling reservoir started after these repairs.

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  • Answer #1

    December 11, 2010, 17:22

    I'm suspicious you have a blown head gasket or two. A mechanic could check for combustion products in the coolant fumes to detect carbon moxide (CO). If there's CO ion the coolant, you have a head gasket problem. I'd check that first.
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