NHC250 M934 Coolant Leak

[captcarc]

Hello. My NHC250 powered M934 has a coolant leak from the bottom of the "heater core box"? I see that the two coolant hoses from the box have thumbscrews at the block. Since I don't use the heater, can I just turn both thumbscrews all the way in to take the heater off-line, stopping the leak? Thank you!

 

[Scar59]

Yes, if they are shut off valves. Make sure they are not bleed screws to vent the cooling system.

 

[Neophyte]

Just went through this myself (ended up replacing the heater core). I closed the valves to stop the leak (until I replaced the core).

It’s an easy fix......though having the heater core rebuilt is $$$.

 

[simp5782]

Heater cores cost about $30 from Oreillys and a $5 piece of metal from home depot. oh and some foam and maybe an hour of your time.

 

[Neophyte]

Heater cores cost about $30 from Oreillys and a $5 piece of metal from home depot. oh and some foam and maybe an hour of your time.

Hi Wes

I just watched your video on YouTube (I’m a subscriber).....amazing what you’ve done with your truck (and how you use it).

I bought one of those heater cores....didn’t seem the thin aluminum “Chineseium” made would last, so I went with a core rebuild (and my wallet felt it). Any data on duration with those? (Picture of aluminum core in background)

 

[simp5782]

Hi Wes

I just watched your video on YouTube (I’m a subscriber).....amazing what you’ve done with your truck (and how you use it).

I bought one of those heater cores....didn’t seem the thin aluminum “Chineseium” made would last, so I went with a core rebuild (and my wallet felt it). Any data on duration with those? (Picture of aluminum core in background)

Thanks. Dont really know. I've got a murray Heater core in my one 923 and it's been in there since 2015 with out issues. However when it gets warm I do close the valves. pull the hoses off and drain the coolant out and suck what I can out with a shop vac. So it doesn't have coolant just sitting it not circulating

 

[74M35A2]

Love the "Chinesium".

Actually, a thin metal heater core should radiate a ton of heat, more than an old designed thick one. I know it is not the tough guy thing to do, and especially with these trucks, but it would probably pump out more heat.


The low velocity blower fan could use a boost on these old dogs.

 

[BenRoberts]

My heater core was shut off when I bought my truck, I'm assuming for a reason. Never really needed heat in it so I never messed with it but is it safe to assume when I open the valves a river of coolant is coming

 

[captcarc]

Thanks Everybody!