Check valves in windscreen washer nozzles. (3 Viewers)

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Oct 12, 2024
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Location
Perth, Australia
Hi All,

See thread title. Anyone know anything about this?

Chris...
 
I read the Toyota nozzles have built in check valves. When I replaced them with Dorman mist nozzles, I noticed they leaked out a bit and took an extra second to start misting. Dorman also makes an inline check valve that I later installed that helped.
 
I did a quick search in the FSM and did not see the tubing orientation under the windshield washer section, but can peek in my truck later. Have you looked around to see if it is a check valve like this? My statement about valves in the pump was from my euro cars

 
Usually the check valve is in the pump. What’s the question.
My nozzles are a bit naff, so I ordered (non-genuine) replacements. After fitting one this morning I used compressed air to blow the original one clean. I noticed if I blew through one of the discharge jets, air would only come out of the other discharge jet. Thinking it might have been blocked, I then blew through the 'inlet' and air came out both jets. I then checked the other new one that was yet to be installed. No check valve.

I've also have a small problem with the washer jets 'dropping prime'. When I check the other (Toyota) nozzle I found the internal check valve not holding. I think this one might be the reason for the dropped prime.

I'm just checking to see if other people have come across the same/similar thing, so I know I'm not losing my sanity (even more)...

Cheers...
Chris.
 

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