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Harbor Freight sells a reasonably priced vacuum fill kit, I like it better than the funnel.@Halfwalker If you're still having issues after a proper fill using the no-spill funnel Patrick recommended, you can have the system vacuumed out and filled that way. Just gotta find someone with the tool to do that job.

Cooling System Test and Refill Kit
Amazing deals on this Cooling System Test & Refill at Harbor Freight. Quality tools & low prices.