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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Ask Your Question1991 GMC Suburban 2500
Question: why is air bubbling back through coolant resevoir
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