Posted Tuesday night:
It’s been below freezing like 15-25 F most mornings when I drive the kids to school, 3 miles round trip all low rpms, but enough to warm up the car. I drove it tonight 35 F and there was no whine to investigate. Hmm… I will have to see what it’s like the next two mornings. It will be 18 F Thursday morning.
Edit: Wednesday morning:
It was 20-22 F this morning and the whine was back with vengeance. I popped the hood while the car was running after doing several lock-to-lock full turns, and saw this milkshake looking fluid. Maybe that’s all air bubbles, but my gut is telling me to drain and fill the fluid. Perhaps I can figure out how to replace the o-rings while at it, and where those o-rings go of course.
Edit 2: Wednesday morning:
I’ve got a 2006 ridgeline too, but haven’t had any problems with it (yet). This looks like the best shipping time and price to buy on Amazon. Maybe it’s worth checking my local dealer and the other site, as it’s possible these o-rings are not Honda brand.
5pcs Inlet & Outlet O-Ring Seal Kit for HONDA Power Steering Pump 91345-RDA-A01 & 91370-SV4-000 Made of Fluorocarbon (Viton)
Amazon.com: 5pcs Inlet & Outlet O-Ring Seal Kit for HONDA Power Steering Pump 91345-RDA-A01 & 91370-SV4-000 Made of Fluorocarbon (Viton) : Automotive
I guess I will need some PS fluid too. Right?
Honda 08206-9002PE Power Steering Fluid Pack of 3
Amazon.com: Honda 08206-9002PE Power Steering Fluid Pack of 3 : Automotive
So I wonder where the other o-ring goes. The first video in post #5 above for the first o-ring on the suction side was very helpful, even showing the part number needed, which matches the link provided above too.
So in trying to figure out where o-ring 2 goes (pressure side of pump above I assume), I clicked on diagram link above, and see the diagram shows the inlet / suction o-ring is included with the PS pump itself. I’m pretty sure this is where the guy in the video in post-5 replaced the o-ring. Perhaps part 25 in this diagram is the pressure side o-ring which is the second one everyone talks about replacing and comes with every suction side o-ring on Amazon.
looking at this I am not seeing a return line o-ring on the pump, only a pressure side o-ring
https://www.hondapartsnow.com/resou...21/large/f34d821f4ce2ae894b779985aea93c9a.png
I'm pretty sure only the 1st gen Pilots PS pump had the inlet & outlet pump o-rings.
…
I’m not sure what model the diagram link you posted refers to, but as you can see above, it doesn’t break down the PS pump. So maybe that’s why the culprit o-ring isn’t shown in this diagram.