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On the coolant tank there is a round black part looks like a cap with a metal bail pull the bail up that allows you purge the air from the coolant tank. What I do is let them idle with the blue cap on and with the bail pulled up this will allow any air out of the system allow it to run till the front fans come on. Also do this with the heater on full blast it allows all the air to escape the system. If none of this works its time to check for combustion gases in the coolant.....
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Tony Proasi
1969S
1957 VW Pickup
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