am I damaging anything if I do the following on my 360: 1. using compressed air on the top of the coolant tank to blow out coolant more thoroughly ( with a towel to help make it airtight) 2. using compressed air on the top of the transaxle oil filling hole to blow out transaxle oil more thoroughly ( with a towel to help make it airtight,) 3. using compressed air on the top of the powersteering oil reservior to blow out PS oil more thoroughly ( with a towel to help make it airtight) These, of course, are done while the drain plugs or pipes(PS fluid) were removed.
You really don't have to do this. The amount of fluid remaining in the system will not harm the engine or pollute the fresh fluids. Just change.
If you are changing the fluids regularly or semi-regularly none of this is needed. If the fluids have been in for a long time, flush as normal, run for a week (100+ miles), then flush again.
As for the oils, compressed air won't do much to remove residual clinging to the interior surfaces anyway --- so don't bother. As for coolant, the best way to remove all old residue is to *gently* flush / purge the circuit with clean (preferably de-ionized / distilled) water ---- use low pressure so as not to disturb gaskets, o-rings, seals, etc., and flush AWAY from (and NOT through) the water pump, so you do not drive any particulates into its seal which will cause it to leak (best to remove it entirely actually, and rig up temporary bypass plumbing for the flush).
Gravity does a great job. One of the reasons those clever engineers put the drain plugs at the bottom.
