[CST10]

Update.

Changed the lower hose and torture tested today.

Ran 210-215 degrees with ac on. Temp dropped only 5 degrees with ac turned off. Idling in both tests. Total run time was 60 minutes.

Thing that puzzles me is that this engine use to run 170-175 all day long without ac running. What changed? Surely the outside temperatures have increased with August heat waves so I can understand maybe running 190, but 210?

Awhile back I tried some plugs with a step up temp range. Use to run ac delco r44t plugs and changed to Ac delec r45ts plugs. Also adjusted timing from 18 initial. And 40 all in to 16 initial and 38 all in.

I have since gone back to the original plugs BUT I did not change the timing back.

Can 2 degrees retarded initial timing cause a increase of about 10 degrees hotter?

At a loss here of the reason the temp change. If the temp idling only drops 5-7 degrees with the ac off that still does not explain the increase of the other 10-15 degrees temp increase.