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Hello I have a 2009 equinox. Washer pump will start only running out the rear nozzle, I’ve replaced several times, each time works great fro about two weeks then starts pumping out the rear. I have cleaned nozzles and lines. Both front and rear look like they connect to pump but it’s driving me crazy any ideas? Thank you!
 

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Why not try plugging the rear washer line only and see if only the front continue to work for a little while.Might be a way to verify that the front window washer lines are not partially blocked, have a leak you are not seeing; or pressure might just be taking the path of least resistance.
 

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Hello I have a 2009 equinox. Washer pump will start only running out the rear nozzle, Both front and rear look like they connect to pump
The way the 2010 and newer is it uses one washer pump for the front and rear.
Yours is probably the same.

The washer switch and BCM reverses polarity on the washer pump.
One way sends fluid to the front and the other sends fluid to the rear.
Is the positive and negative reversing at the washer pump?
 
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