QUOTE(gereed75 @ Sep 10 2017, 06:52 PM)
In general, you want it to pull. Just did one and from memory the wires are color coded for + red and - black.
Also, I am not a motor expert, but I believe these brushed DC motors will spin either way, depending on the applied polarity. Motor experts are welcome to set us straight on that one.
Generally true but some motors are reversible and fan makers do not like to have double the fan SKU's by having the wire colors consistent to + pos and - neg.
Use one motor in both applications with either a puller or pusher blade.
Some motors are not reversible due to brush angle optimised to reduce drag in one direction. When reversed the wear the brushes fast.
Most of the modern motors are brushless.
Like other have said get the part number off of the sticker on the fan if you can read it.
Or match it to size and config on there site.
Hook it up and see how much air it pulls.
What is the whole deal here? Airflow in and out and cooling what engine ? Fans mainly assist in low speed. The motion of the vehicle should move enough air to cool the engine.