[decooney]

• Check to see if you have a sticky thermostat 1st. Could be hanging. I put mine in a pot of water on the stove. Watch it open and close a few times; see if it sticks or opens and closes smoothly through each heat/cold test cycle.
  
• Drain out all of the anti-freeze. Get it out of there in the summer time.
  
• Raise the front end, burp the system / expansion tank or at intake.
  
• Fill back up with pure water, while its UP in the air - front end up, remove cap on expansion tank.
  
• Try it again, and see if anything changes.
  
  Dump out the hose water right after, and go get some distilled water and fill it up or just get some to begin with 1st try.

Next step,

• Add water wetter.
• Get a really good puller fan, as other's have suggested. Pushers are for looks.
• Keep an eye on how many miles you have on it; still in break-in period.
• Try it again, and see if anything changes.