Looked at a 91 Ford F350 today with a 7.3 L IDI diesel motor. Upon topping off radiator and starting the truck up I noticed a lot of small air bubbles while looking into the radiator, wondering if head gasket is leaking or what your thoughts are. Thanks
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Radiator had pressure built up prior to taking cap off, was very low. Overflow tank was VERY full. When running after filling radiator noticed a lot of small bubbles in coolant, almost looked like carbonation in soda style bubbles.
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