Vented or Non Vented Cap?

[Damon92]

I have a 1992 Damon Challenger Diesel Pusher. It has an opaque tank that holds hydraulic fluid/trans fluid for brakes and power steering. I noticed the cap thats on it (I believe is the wrong one) is leaking everywhere and causing a whining noise. The cap now is vented. I am going to replace is but should this be vented or non vented?? I was about to go with non vented but thought Id check first.

[Damon92]

Here is a picture.

[AKJohn]

Before changing to a non-vented cap I would contact the engine manufacturer and find out what type of cap they recommend. It's hard to tell from the photo but it looks like the fluid might be leaking from around the threads on the cap. If that's the case you may need a replacement cap but there's no telling what problems may arise from the wrong (vented or non-vented) cap. Good luck.

[TQ60]

Too full...

Should be vented to allow system to work.

Usually have dipstick in cap, level below neck.

Look it up in the manual, or contact nanufacturer or servicer for sure, but likely just too much fluid, always check in "driving condition" unless stated otherwise

[Damon92]

Its not too much fluid it was dry bc it was all over the side of the container. I added some back and then took a picture. Is it vented on your coach?