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Old 10-13-2018, 11:49 PM   #1
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Dash heater core leak?

I have been losing a little coolant and I noticed a wet spot on the top of my generator 2007 Newmar essex. The heater core box is wet with coolant. Are there shut of valves in the heater lines so I can fix after I get set up down south? I've read elsewhere that some coaches have them located near the engine compartment. I also have in the past disconnected the 2 hoses on cars and connected them together with a fitting as a short term fix.
Thanks for any input,
Joe
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Old 10-14-2018, 10:46 AM   #2
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The simplest and cheapest temporary fix would be to use a section of copper tubing of the correct diameter and a couple of hose clamps. Remove the hoses from the heater core, insert the copper pipe as a coupler, and use the hose clamps to hold them together. You can then get the heater core out of the plenum and either repaired or replaced when you get to your destination.
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Old 10-14-2018, 11:06 AM   #3
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All the major auto parts stores sell an adapter that you can join the hoses together with. You may have two different sizes of hoses as many do. 15 minutes and you are set to go.
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Old 10-14-2018, 11:07 AM   #4
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Some of the stop leaks are very good. Barsleak is one. They will usually hold for a year, but you can add it every year and it works. I've done that. To pull that leaking core is a major job.(Been there) I bypassed one once using a prestone flush kit adapter to connect the two hoses.
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Old 10-14-2018, 11:13 AM   #5
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Hi Joe! Welcome to IRV2! We're sure glad you joined the gang!

I can't help with the problem but noticed that you are kinda new on IRV2 and wanted to say hello! Have fun and keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 10-14-2018, 11:26 AM   #6
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I'd NEVER do Barsleak, in my pea-brain I see it clogging up my radiator as well as my heatercore, adhearing to the inside of the engine's water jacket and hoses and everything. The heater core on my DP looks so easy, I can use my slid-out genetator as a tool/beer bench. The core is right there, bada-bing, bada-boom and some yada-yada and it's out. Finding a new one might be difficult, but a good radiator shop might be able to recore the old one.
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Old 10-14-2018, 11:42 AM   #7
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Quote:
Originally Posted by Kraken View Post
Some of the stop leaks are very good. Barsleak is one. They will usually hold for a year, but you can add it every year and it works. I've done that. To pull that leaking core is a major job.(Been there) I bypassed one once using a prestone flush kit adapter to connect the two hoses.


You can jump 2 min into the actual core clogged from stop leak additive.

https://www.youtube.com/watch?reload=9&v=46dxAqgvYF8
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Old 10-14-2018, 11:49 AM   #8
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My 8.3 ISC has valves on each side of engine to valve off heater. Require standing on head under Bed. No stop leak in my vehicles!
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Old 10-14-2018, 12:58 PM   #9
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On my Monaco, there is a valve near the heater core that lets me bypass the core.

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Old 10-14-2018, 03:05 PM   #10
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Joe....take a look at the engine on the driver's side from underneath. Typically, you'll find some valves built into the heater lines running forward. The newer ones have yellow twist handles. This will allow you to shut the coolant off running to the front.
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Old 10-15-2018, 12:33 AM   #11
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Quote:
Originally Posted by TonyMac View Post
I'd NEVER do Barsleak, in my pea-brain I see it clogging up my radiator as well as my heatercore, adhearing to the inside of the engine's water jacket and hoses and everything. The heater core on my DP looks so easy, I can use my slid-out genetator as a tool/beer bench. The core is right there, bada-bing, bada-boom and some yada-yada and it's out. Finding a new one might be difficult, but a good radiator shop might be able to recore the old one.
Barsleak (and others) can also mess up your thermostat.
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Old 10-15-2018, 08:20 AM   #12
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Thanks for all the feedback! Went to Napa picked up 2 - 5/8" 90 degree fittings and a few clamps and back on the road again to Arizona for the winter. There are quite a few short hoses and connections around the heater core that I'm going to replace when I get settled in in about a week or so. The leak may not be in the heater core. Thanks again for all the help.
Joe
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Old 10-15-2018, 06:23 PM   #13
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Had the same problem. I installed 2 ball valves as described in post #1 & 2 in this thread. Got all the parts from HD.

Making you dash air conditoner provide cooler air during hot weather

Since we don't travel in the winter, don't know if I'll ever invest the time & $ to repair. If I do, it will be easy to just open the valves.
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Old 10-18-2018, 02:35 AM   #14
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Welcome to the forum!!
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