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Old 02-06-2022, 02:31 PM   #1
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Red fluid leak

Checked on my 2021 Seneca 37L in storage today. Puddle of red fluid under front passenger side area. Picture shows the source. Iím not an engine guy so help with diagnosis appreciated.
I have it scheduled for oil change and regular maintenance next month but itís an hour drive so wondering if this would impact that drive and what I can do if needed.

JG
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Old 02-06-2022, 02:46 PM   #2
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Looks like anti-freeze to me. I would tighten the clamp and check the coolant level and add coolant if needed, if it is still in the safe zone then you could drive it and have it topped off when you get the oil change. ~CA
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Old 02-06-2022, 03:00 PM   #3
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red fluid leak

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Originally Posted by jeffgladd View Post
Checked on my 2021 Seneca 37L in storage today. Puddle of red fluid under front passenger side area. Picture shows the source. Iím not an engine guy so help with diagnosis appreciated.
I have it scheduled for oil change and regular maintenance next month but itís an hour drive so wondering if this would impact that drive and what I can do if needed.

JG
it is antifreeze, i have had seeps on mine tighten up hose clamps
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Old 02-07-2022, 08:44 AM   #4
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ďColdĒ coolant leaks are not uncommon on new trucks. Just tighen the clamp, donít kill it, and while youíre at it, snug up all the others. I had a heater hose that was seeping a little.
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Old 02-07-2022, 11:08 AM   #5
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We had a drip too, just tighten all the hose clamps you can reach.
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Old 02-07-2022, 02:01 PM   #6
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I had a leak also on 2021 37k. They can loosen from new under heat cycles. Pretty normal. 5/16 fits the hose clamps and snug all you can locate.mine is good now
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Old 02-07-2022, 05:33 PM   #7
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There has also been an issue with the clamps being put on to far back from the end of the hose or the clamps on crooked, causing a leak. Looking at your pic, if it was mine, I would move the clamp a little more toward the end of the hose.

By the way, that hose is connected to the transmission cooler.
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Old 02-07-2022, 07:05 PM   #8
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Red fluid could also be transmission fluid or hydraulic fluid.
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Old 02-07-2022, 10:35 PM   #9
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Originally Posted by Bugzilla46310 View Post
Red fluid could also be transmission fluid or hydraulic fluid.
This connection point is a coolant leak.
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Old 02-10-2022, 08:08 PM   #10
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I have a red fluid leak too, just found it today now that the rain dried up.

Passenger side of the engine, and pretty far back towards the flywheel side..

Fairly certain it's coolant. I sniffed the ATF on the dipstick to compare, and pretty sure it's coolant. It feels slicker than coolant, but not as slick as ATF.

I can't find out where it's coming from. It's UP on the passenger side, which also makes me think NOT atf. I see multiple wire looms, hoses that have red fluid on them so its dripping down from SOMEWHERE, and the coolant reservoir is also now below "min".

I'll have to poke around some more tomorrow, but, any ideas? I couldn't see where coolant lines go through the firewall for the heater core so maybe it's coming from there?
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Old 02-11-2022, 06:07 AM   #11
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Originally Posted by 22Seneca View Post
I have a red fluid leak too, just found it today now that the rain dried up.

Passenger side of the engine, and pretty far back towards the flywheel side..

Fairly certain it's coolant. I sniffed the ATF on the dipstick to compare, and pretty sure it's coolant. It feels slicker than coolant, but not as slick as ATF.

I can't find out where it's coming from. It's UP on the passenger side, which also makes me think NOT atf. I see multiple wire looms, hoses that have red fluid on them so its dripping down from SOMEWHERE, and the coolant reservoir is also now below "min".

I'll have to poke around some more tomorrow, but, any ideas? I couldn't see where coolant lines go through the firewall for the heater core so maybe it's coming from there?
Take one drop of fluid taste it if sweet it's antifreeze, spit it out don't swallow, lol,
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Old 02-11-2022, 10:20 AM   #12
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Take one drop of fluid taste it if sweet it's antifreeze, spit it out don't swallow, lol,
Spoiler alert: Modern coolants are bitter to taste, but smell sweet. They contain bittering agents so children and pets are less likely to consume any real quantity. They have not yet found a way to make grown men resist tasting it to identify its origin, however.

Both ATF and coolant taste similarly: Nasty. I do not recommend.
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Old 02-11-2022, 09:35 PM   #13
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We have a 2019 37TS that had a leak from the transmission cooler. Western Freightliner of Corpus Christi found a crack at the cooler block and replaced it under warranty today. We have 14,100 miles on our rig. A week earlier they replaced a defective DEF header. That’s when they found the leak and ordered the parts.
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Old 02-11-2022, 10:10 PM   #14
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We have a 2019 37TS that had a leak from the transmission cooler. Western Freightliner of Corpus Christi found a crack at the cooler block and replaced it under warranty today. We have 14,100 miles on our rig. A week earlier they replaced a defective DEF header. Thatís when they found the leak and ordered the parts.
Thatís a spot I keep an eye on, there have been several reports of this, they crack around a weld.
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Old 02-12-2022, 04:34 PM   #15
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This is what we bought to top off the coolant reservoir in our Ď22.

Straight from the guy at the Freightliner parts counter: ďYeah that should work, all red coolant is the same.Ē (Not true).

The Freightliner chassis manual says check the engine (Cummins) owners manual for coolant spec. The Cummins manual says consult the OEM for specó Cummins doesnít ship their engines with coolant, Freightliner adds the coolant of their choosing.

Everywhere I read says use this stuff (OAT). Before I dump it in, any one know any wiser?
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Old 02-12-2022, 08:01 PM   #16
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You should have a sticker by the reservoir tank stating what type the system is filled with. What you bought is what I use.
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