Just swapped out my heater core using this method. Cut the framework on the drivers side of that upper mount, and did not put it back. After putting it back together everything is functioning as it should. Super glad I did this rather than tearing everything apart of paying someone else to.

Happy Jeeping!

 

I haven't installed one...yet. I was having a discussion awhile back after I replaced my HC and someone mentioned that when the dealership replaced their HC, they also added one of these filters within the HC inlet hose. Now that we understand what is going on with many of these HC failures, it seems to make a lot of sense for the reason the dealership added this filter. So I don't have any personal experience at this time. To be truthful, I've kind of been crossing my fingers that since it took 6 years before my HC got clogged up with casting sand, that the casting sand that was left in my engine block is now gone. I know wishful thinking.

Like yourself, I wish I had known about this earlier and I would have added one while I had things all apart.

 

I am about to start replacement of my JK heater core (all parts are in the garage waiting for the temps to rise a bit next weekend) and I intend to flush the system as well.

My question is the sequence:
* Flush then replace?
* Or drain, replace and then flush the system?
If I flush 1st, will I get everything?
Vs. If I flush 2nd after the new core is in, will I be putting crud into the new heater core only to see it get blocked again?

 

I'd flush beforehand, which also will mean less mess in the cab when cutting the old core out.

 

I'ld drain, flush, drain, and then replace HC, then fill with 50/50 coolant. I think that would get the majority of what is running through the system out. The only problem is if there's casting sand still sitting in the block. That's where the added filter would be a benefit to catch future sediments of casting sand being picked up.

 

I flushed just the heater core with radiator flush and that partially opened up the heater core, at least now it is blowing warm air. One more flush may solve it completely. No need to to change anything

 

Good luck! I've been down that path with similar thoughts. I hope your flushing turns out better than mine did.

 

The Mishimoto designed filter gave me some additional DIY ideas. It seems their design already existed elsewhere, and just added some mounting convenience for the JK, where I kind of prefer the idea of being able to mount the filter in an area that works best for me.

This


Plus a couple of these which is a 1/2in thread to 5/8in hose fitting.


Plus this and some 5/8" hose should work well.


It seems the XJ had the same problem with engine casting sand where here's a guy on Amazon showing this setup for his XJ.

 

Rednroll - I agree, drain, flush, drain , swap and fill. Thanks.

 

Just finished installing a new radiator and heater core (using the shortcut method). My heat is a bit better but still have a temp difference between passenger and driver and the heat changes based on use of skinny pedal. Thoughts?