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I also thought of multiple cores, especially since the heater box is so large to be able to accommodate it. But, my concern here is the volume of airflow. It seems somewhat low to begin with. Adding additional cores will reduce this further again. My heater had poor performance, and it...

398010 is supposedly the number in the automotive aftermarket. Slight modification required, so do a search and check the detail of what you would need to do to get it to work, looks easy though. People have pics and results posted. I just woke up and not energetic enough yet to find the...

You should remove the live eBay links very quickly. If a moderator does it for you before you do, they will likely give you a 30 day ban from the board or so. They really don't warn about them. The action will probably happen in less than an hour from your post. The hose connections on...

Rock auto probably has it for even half of that, I have good luck with them. Do a search here, a couple have done it and show the mods needed to the box, it is minor and easy to do. The core doesn't fit exactly, and one side needs to be slightly built up with adhesive backed weather strip or...

I think so. You have a perfect storm working against you. 1. Diesel engines don't generate nearly the same amount of heat as a gasoline engine. 2. The heater is always breathing in outside air. 3. The heater core box is steel and located outside. If I was going to leave mine under the...

Not an answer to your questions, but I am changing mine in two ways due to poor heat (M925A2) and wanting the cab warm in MI winters: 1. Relocating the entire heater core box+fan to under the seat. I converted to two group 31 batteries specifically for this reason. This way, the heater can...