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Use the heater, it helps to get any air circulated out of the system. The absolute best way to get it completely bled is to drive the car on your commute and use the commute to avoid running the engine unnecessarily.
The recovery bottle cares not about a 4% slope. Check to see that the coolant is filling the recovery bottle when you stop with the engine hot, at your destination The bottle usually has a cold and hot mark. As long as you check it consistently cold and hot you know the level and if it has changed through several cycles (cold-warm).
When the changes are exactly the same and you can't get any more air out of the bleeder, youre finished with bleeding.
If you open up the system, anywhere except at the cap when cold, you get to start the bleeding process all over again.
regards
mech
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