Quote:
Originally Posted by Silver SLP
I have the same issue going on. Last year, I just replaced the fluid and that seemed to work. This year, the loud whine is back. My fluid still looks fine though, no odd color to it, but there are air bubbles in it. The fluid is at the "full" mark on the dipstick. Turning the wheel back and forth once it's just started produced a very loud whine, so does revving the engine. Once it's warmed up, the noise eventually goes away. Last week it was -50* F with windchill, and this whining only happens during the winter months.
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GM has a bulletin out for the 2013 (other years too) Treverses. bulletin number
#12-02-32-002A. concern for power steering noise caused by extreme low climate temperatures causing the fluid to thicken and cause noise/damage to power steering components from high pressure. they recommend flushing the system with "cold climate" power steering fluid GM P/N 12345866 for the 16 oz bottle, or 12345867 for the 32oz bottle.
additionally, they also state that if this concern still happens in cold tempatures to flush with DEXRON HP ATF part number 19300536.
you might try flushing your p/s with ATF. you can mix the two fluids so dont worry about being perfect. i know my old alero has had atf in for 30k miles. plug we have been flushings treverses with ATF on a regular basis.