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Message: <blockquote data-quote="Steve Brothers" data-source="post: 1052696" data-attributes="member: 62082"><p>4.0 liter is really hard to purge of air. I always had trouble purging it. They sell a vacuum purger which would make it easier, but  I used the big radiator fill funnel they sell at Harbor Freight (cheap) and other places. Don’t overfill the funnel during the process because then it becomes a volcano when the air escapes.  I also jacked up the left front corner of the truck to get the radiator cap as high as possible. Heater on high.  When the engine is warm, rev it to 2000 RPMs for 20 seconds or so. Idle for a bit, and rev it again. Do this several times and be patient. Add some coolant to the funnel if needed, but just a bit, to prevent a volcano gusher.  The object is to get all the air to the top of the radiator. The air is probably in your heater core, which is why you want the heater on. The high revs are to try and push the air out and into the radiator.  When you think you are done, remove the coolant funnel and replace the cap. Take it for a short drive watching the temp gauge. If all seems good, park it and let it completely cool. When completely cool, take the cap off and make sure you are fully full, and also fill the overfill container to the minimum level.  Watch your temp gauge on the next drive, and check the levels when cold after a couple of cycles.</p></blockquote><p></p>