I am having similar problems right now. I put in a rebuilt engine and replaced everything except the rad. because it was still good. I replaced the fan last night with a 18" flex fan and seems to help a little. The other thing that I am going to do is to flush the system. I do have one problem that you didnt mention. I seam to run low on coolant, I am guessing because it runs on the warm side.
Hope you can figure it out soon.
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New Project - 72 Blazer 4WD 307/3 spd, PS, PB, Posi (Current Project)
- 83 Chevy SWB Rebuit 350/TH-350 with shift kit, buckets (daily driver)
http://members.xoom.com/luc_nt
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1972 Chevy C-10 Short Stepside
6Cyl, 3 spd, not opts
(Current Project)
Now a 2004 SSR 5.3L with 4L60E
Now Ididit tilt- ps, pb
2002 Saturn L200
2006 Toyota Highlander HYBRID
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