DIY Coolant Filter
Fleet Mechanic
Joined: Jan 2011
Posts: 1,792
Likes: 72
From: Richland, WA
Yeah, 5/8" hose. That's the size of the fittings for that filter base. No change in cabin heat.
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Senior User
Joined: Oct 2015
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I got 3/8 npt bungs in my filter base so just gonna buy 2 5/8 T fittings and 2 3/8 npt to 5/8 barb 90 degree fittings. I have 5/8 heater hose laying around so I can use that.
VT Chapter Ldr
Joined: Apr 2004
Posts: 96,096
Likes: 294
From: Orange, Vermont
I have a question. How much coolant would really flow through the filter? Liquid will take the path of least resistance. If you aren't reducing the volume of the original flow path, wouldn't the coolant flow into the new filter and lines until filled and then be kind of stagnant? The filter would create some resistance do to the filter material. Wouldn't you need to reduce the hose size or area just after the T for coolant flow into the filter to force it to keep a flow going into the filter? Maybe put another gate valve or similar there to so you can manually reduce the area in the line to create a little restriction?
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Senior User
Joined: Oct 2015
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ahhhh ok that makes sense now so you are running 5/8 hose but your filter is the most restrictive part with the 3/8
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Senior User
Joined: Oct 2015
Posts: 295
Likes: 0
I have a question. How much coolant would really flow through the filter? Liquid will take the path of least resistance. If you aren't reducing the volume of the original flow path, wouldn't the coolant flow into the new filter and lines until filled and then be kind of stagnant? The filter would create some resistance do to the filter material. Wouldn't you need to reduce the hose size or area just after the T for coolant flow into the filter to force it to keep a flow going into the filter? Maybe put another gate valve or similar there to so you can manually reduce the area in the line to create a little restriction?
this is a good point, would running the same set up as tapping into the supply and return lines of heater core but instead using 3/8 hose to supply the filter price to be more efficient? I know very little on fluid flow but what you're saying I can make sense of, but as with many things in life they aren't always as they appear or how we'd assume them to work so would love to hear someone who knows a lot about fluid flow chime in on this
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