If all other suggestions fail, you may want to check your water pump. Bad impeller not easy to spot. Even if water leaking out of the weep hole, drip may be evaporating on a hot spot and may be difficult to notice. I put a Be Cool radiator in my 72 Cutlass, kept the original fan, clutch, and shroud. Replaced the water pump and thermostat. My overheating problems were solved.
 
 
Bruce
72 Cutlass Conv.
56 Mercedes 190SL Conv.
05 Caddy STS
04 Caddy SRX

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