To.be on safe side use factory 0.9 original specifications.using 1.1 raise boiling point. 0.9 lower boiling point opening pressure 13 psi.use factory specs.to keep from damaging engine.
SOURCE: 99 DODGE STRATUS RADIATOR OVERFLOW BOTTLE
Double check that your rad cooling fan is operating as it should, but after that, I'd be looking at a good rad flush, or rad replace. Believe it or not, your heater core is like a small rad, and when you turn the heater on, it actually cools the circulating coolant, slighly,and therefore shows a difference on your gauge. Like I said, make sure the rad fan is coming on when engine temperature is at normal or slightly higher, and if it is, then I'd be taking a close look at my radiator, especially if it wasn't replaced when headgasket was done.
SOURCE: 1997 bmw z3 conv. 1.9 overheated, changed
hi jasso, I would recommend checking the water pump if you see no flow in the radiator. Make sure when you fill up the cooling system, that you fill it cold, and that the vent screw in the radiator is loose. fill system until fluid comes out the vent screw. tighten the screw, start the car and have someone run at 1500rpm and check for flow.also, make sure that you have your temp setting full hot and blower on middle speed so that you don't trap air in the heater core.
SOURCE: Engine overheating in traffic or when idling
I'm assuming your car has the Northstar engine?.
Strangely enough,if you remove the thermostat in the Northstar engine, it will overheat, this is because the stat is both a thermostat and a pressure valve.I can't be bothered to explain in detail how the whole cooling system works but please understand that you need to put the stat back in,(or preferably a new one).As for the cooling fans,what you described is normal for the Northstar.
Further to this, look at my profile,I have provided similar solutions for overheating problems.
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