Generally speaking where is the correct spot to hook into the cooling water for cab heat and for water filters
I’ve seen about every possible combination
Just wondering if there’s a by the book correct way…..it’s a w900 daycab but I would think it’s not really to important what it’s in
@wore out
3406b heater and water filter connections
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by W923, Feb 17, 2026.
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I agree with about any way except pulling out of between 5&6 for the heater core.
I hope that makes senseW923 Thanks this. -
3 and 4?
Can’t say I’ve ever seen a plug between 5 and 6wore out Thanks this. -
that’s as wrong as 2 boys fornicating. I can’t say I have scientific evidence but I have had countless folks score a piston after turning their hot water on first time of the year plumbed like that. So it’s more superstition than obvious fact. But i believe that will make one cavitate and get number 6 every time. Now this ol truck has always got on well with it. But I keep that in mind and don’t run it hard either. I bought it this way and just haven’t changed itblairandgretchen and W923 Thank this. -
Thanks
I wasn’t thinking about that port
I had cylinder head in mindwore out Thanks this.
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