Cummins X15 Heater Core Fitting

Where the coolant comes out of the heater core, there is a plastic fitting. Between 150,000 to 200,000 miles this plastic fitting breaks off blowing all your coolant out. Do yourself a favor and replace it now with a metal one like it should be in the first place.

When it breaks it’ll be on a Sunday when no parts are available costing you 2 road side charges plus a repower on a hot load.

 

Take a picture of what your talking about please

 

Plastic quick connect fittings were used on Paccar and Cummins engines on Pete's and KW. RR of the engine to heater core supply.

Plastic fittings are obsolete and updated to a brass nipple available in 5/8" and 3/4" nipple.

 

Here you go.

This was on my 2018 T680. I checked the 2019 and both 2020’s and they have the plastic as well. So, updating them all to the metal as it’ll just happen again. This really should be a recall IMO. My contact at KW said he sees this happen every week. Hope this information helps someone.

 

Does the coolant need to be drained prior to replacing and do you have part number for replacement fitting?

 

My Volvo has plastic barbs on both ends of the two lines that go from the coolant filter to near the DEF doser valve. So far, 3 of the 4 have broken. I'm not sure if they make an upgraded part, or if I can change it to a better material. My solution so far has been to slip a larger diameter hose to join the broken ends back together and clamping them down. The worst part is that it's pretty much the lowest point on the truck, so almost all of the coolant gets lost when one breaks.

 

Guess the plastic fittings are used on the cheap trucks where the dealers dont order the shutoff valves. My 2018 pete with the x15 has shutoff valves like it’s supposed to have.

 

That’s sort of a crappy thing to say that my truck is cheap just because it doesn’t have a shut off valve. What’s cheap is that Cummins decided to use a plastic fitting.

You have no idea the specs of my truck.

 

This part is not supplied by Cummins but the truck manufacturer.

I agree crappy, nonetheless.

Quick connects are used for one reason, and one reason only.............save time on the assembly line.

 

It ain't Cummings, it is the truck manufacturer.

Edit ... didn't see the post above before I posted.