Def could be running lean.
One face in front & one behind the radiator?
Make sure their not spinning in opposite of each other and that their both coming on when they should.
Does it steadely climb up while your driving, or does it just shoot up their after awhile?
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USAF Jet Propulsion Specialist
 1985 383 Camaro-nothing special I promise 
2000 NBM z28-also nothing special
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