One would think if passenger side had good heat it would be a directional flow problem. Please keep us informed after dealer visit.

 

This is the message we are looking at: https://static.oemdtc.com/TSB/MC-10144918-9999.pdf

 

Thanks.................So does the service bulletin apply being out of warranty ? They're going to do it anyway ? Damn diesels.................

 

This one is out of warranty so no, they won't take care of it, it is up to us.

 

I finally get this truck back for a couple days! Has anyone come across a problem like this? I am going to back flush the heater core and see what happens, but I'm not holding my breath! I suspect something in the airbox is amiss!

 

Figured it out, the duct splits at the heater core, the top part goes to the passenger side and the bottom of the heater core goes to the drivers heat side. Tried to make a video of the whole process, but this is all I got!

I had posted the wrong links, these are the correct ones:
https://rumble.com/vs14ag-heater-cor...werstroke.html

https://rumble.com/vs7wv6-heater-cor...ke-part-2.html

Sorry about that.

 

Had two of these, the first one I replaced the heater core
and it took care of the problem, the second one we used
pulsating hot water back and forth through the heater core,
till there was no more grease coming out. Use a garden hose
for hot water in and a 5 gal bucket to catch what came out,
when the grease stopped showing we put it back together and
it has worked like it should since. We connected a water
nozzle to the hose and just made the water pulsate by
squeezing short blasts of hot water.....anyway it worked.

 

These are the correct links, showing the heater core problem.

https://rumble.com/vs14ag-heater-cor...werstroke.html
https://rumble.com/vs7wv6-heater-cor...ke-part-2.html

 

I wonder what the grease was and why it's in the cooling system.

That looks like a really difficult job.

 

I read a message, stating the grease was from unclean assembly of the engine, during assembly at the plant. This was a problem for many new trucks.