your 98 should have had pink(dexcool)
hope it doesnt have any problems with mixing green.
After many years and many more GM vehicles with previous owners that didnt keep up Dexcool service intervals,Ive found a cleaner that works to get rid of the horrible brown Dexcool sludge.I would do the flush,refill with water and a gutted thermostat and cleaner and run for a few hours,then do a couple flush/refills with plain water.See if that doesnt help before refilling with your choice of antifreeze. BTW I still use dexcool on all my later model GMs. Remember to purge the air out of your 98 when done.
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Everything comes and goes
Pleasure moves on too early
And trouble leaves too slow
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