Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Newmar Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 01-30-2023, 01:23 PM   #1
Junior Member
Longhorn81's Avatar
Newmar Owners Club
Join Date: Apr 2019
Location: Colleyville, TX
Posts: 20
Troubleshooting Low Coolant Level Warning Message

60 days ago my local Newmar dealer addressed a low coolant level warning issue by replacing my transmission oil cooler. The dealer said they saw evidence of a leak however there was never any kind of evidence of a leak on the ground at my storage unit coming from the rear of the chassis (Freightliner).
Yesterday, during an exercise session and fuel fill, I briefly got another low coolant message and the yellow MIL light came on and stayed on. I don't know how to access the code(s) that would tell me the MIL light is related to the low coolant message however it seems highly likely.
When I got back to my storage unit I noticed a spot on the ground more or less under the front driver side jack. The spot, which is about the size of a trash can lid, is a dark rust color and is not at all wet to the touch. I noticed the spot in the past but always thought it was there when I rented the space. Now it appears to be slightly larger as if there might be a small/slight leak that moves around as I park in slightly different locations.
I crawled under the RV and took pictures in hopes of identifying where a leak might be coming from. Please see pic below. I found no evidence of dripping although as shown in the pic there appears to be a rusty hose/pipe of some kind that could be the source. Can anybody identify this hose/pipe and help me determine if it is carrying coolant? At the point where this pic was taken the hose/pipe runs side to side (as opposed to front to back). All thoughts, comments, guesses welcomed. Sorry about the long post! TIA.
Attached Thumbnails
Click image for larger version

Name:	Front Driver Side Jack.jpg
Views:	9
Size:	371.7 KB
ID:	385372  
John & Debbie
2019 Newmar VT 4369 (Freightliner)
2022 Jeep Gladiator
Longhorn81 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free! RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 01-30-2023, 02:02 PM   #2
Senior Member
MikeyG's Avatar
Newmar Owners Club
Join Date: Apr 2010
Location: Pleasanton, CA
Posts: 498
I had the low coolant warning and MIL lights two years ago. Plenty of coolant in the tank as verified through the sight glass and nothing on the ground indicating any sort of leak. Turned out it was a sending unit in the coolant tank that went bad. Had to drain most of the coolant, replace the sending unit, and refill the tank. Done under warranty at FL.
Hope your issue is that easy.
Good luck,
Mike G
2019 Newmar Dutch Star 4018 - Freighliner
2022 F150 Platinum or 1973 Toyota FJ40
MikeyG is offline   Reply With Quote
Old 01-30-2023, 02:53 PM   #3
Senior Member
Toribk's Avatar
Join Date: Oct 2011
Posts: 854
Yes....if you have a coolant reservoir, check to make certain the fluid level in the reservoir is at the normal "Cold" mark usually embossed on the tank.

When it falls below that, the amber MIL will illuminate on the dash. As mentioned previously, if the level is could have a bad sensor at the reservoir.

I included photos of my old sensor (leaking) and the new one I installed just for reference on my Freightliner XC Chassis.

Any dark liquid found around the bottom of a jack leg COULD be a slight hydraulic leak.

Let us know when you find out.Click image for larger version

Name:	20200531_132910.jpg
Views:	7
Size:	24.4 KB
ID:	385379Click image for larger version

Name:	tapatalk_1592397077938.jpg
Views:	7
Size:	44.5 KB
ID:	385380
Toribk is offline   Reply With Quote
Old 01-30-2023, 03:45 PM   #4
"Formerly Diplomat Don"
Dutch Star Don's Avatar
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 21,956
A couple of things.....that transmission coolant tank in 2019 was known to leak. There are some welded bungs on the upper side of the tank that leaked, but typically blew off before they dripped. I had mine replaced and know of several others that were replaced. They are Chinese made.

Second, the first year we owned our 2019 DS, the tank level sensor glitched, threw a code, but cleared when we pulled into a Cummins shop for replacement. It was replaced anyway. With that said, sometimes when they install that new tank, they may not have gotten all the air out and your coolant tank could be low. Read your Manual and it will tell you how to access the codes via the dash, then call Freightliner and they'll tell you what they mean.

Lastly, if you have lead acid batteries, my guess would be that you're dripping battery acid where that spot behind the left front wheel. The coolant lines are run in the frame rail on the passenger side.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
Dutch Star Don is offline   Reply With Quote
Old 01-31-2023, 02:03 PM   #5
Junior Member
Longhorn81's Avatar
Newmar Owners Club
Join Date: Apr 2019
Location: Colleyville, TX
Posts: 20
Thanks for the responses guys. They give me a few things to look into. Oh, and Don, I think my new trans cooler was made near Ft. Knox (given the price). I'll post my findings once I know more.
John & Debbie
2019 Newmar VT 4369 (Freightliner)
2022 Jeep Gladiator
Longhorn81 is offline   Reply With Quote

coolant, troubleshooting, warning

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Leaking engine coolant. Error message saying low engine coolant. Radiator cap local Wayrig Class A Motorhome Discussions 6 09-28-2020 09:34 PM
Low Coolant Level Warning dr.perry Newmar Owner's Forum 9 06-26-2019 10:35 AM
Low Coolant Light on but Coolant is not low Jfreeman Monaco Owner's Forum 21 07-18-2017 05:37 PM
Low coolant warning light heads up warning autofish Winnebago Industries Owner's Forum 1 06-22-2009 08:00 PM
Low coolant level warning dshogman Alpine Coach Owner's Forum 1 08-18-2007 02:34 AM

» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 08:41 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.