Is the air dam that bolts to the bottom of the car still in place? This is the number one cause of overheating in a thirdgen. Somewhere along the way people lose them to parking blocks, the elements, speed bumps, etc and there is no airflow up to the radiator at that point.
If that's good check that your fans are working properly and as stated above check out the hoses.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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