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Old 04-25-2022, 10:14 AM   #1
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Join Date: Apr 2022
Location: Rocky Mts, Colorado
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Year: 1994
Coachwork: GMC Thomas handicap shorty
Chassis: 1 ton, 3500 -duallies, Vandura
Engine: 350 CFI, 4L80E trans
Floor Heating using engine coolant

Anyone run engine coolant lines for flooring heat?

Just thinking of keeping it simple and running coolant lines back onto the floor.
Pex would not be used as I don't think it's rated for that high of temperatures.
I have a bunch of 3/4' copper tubing that would work well.

I don't want some sophisticated and expensive set up with heaters and pumps , etc, etc. etc.

If need be, I could just get a couple of heater cores (and small fans) and mount them in the back and run lines to them. But I'd prefer the underfloor heating. Heck, maybe both.

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Old 04-25-2022, 10:45 AM   #2
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I would think there would be a burn concern using engine coolant in radiant floor loops. Most radiant floor systems aren't near as hot as your engine coolant is. Anything over 150F will cause 3rd degree burns rather quickly. Now you could use heat exchangers and thermostats to knock down the temp and get a system that uses excess engine heat to heat your radiant loops, and members on here have done such things, but I wouldn't consider any of them simple.
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Old 04-25-2022, 10:58 AM   #3
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Join Date: Apr 2022
Location: Rocky Mts, Colorado
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Year: 1994
Coachwork: GMC Thomas handicap shorty
Chassis: 1 ton, 3500 -duallies, Vandura
Engine: 350 CFI, 4L80E trans
Thanks. Maybe just pick up a couple of heater cores and box them in with fans would be super easy. Even small radiators, ;)
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Old 04-25-2022, 11:48 AM   #4
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Do it properly not redneck engineering.

Mixing to get the right temp, thermostats, tie in to HWS, maybe electric and diesel water heaters, insulated storage calorifiers, air exchange radiators, good insulation, etcetc
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Old 04-25-2022, 12:15 PM   #5
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Join Date: Apr 2022
Location: Rocky Mts, Colorado
Posts: 25
Year: 1994
Coachwork: GMC Thomas handicap shorty
Chassis: 1 ton, 3500 -duallies, Vandura
Engine: 350 CFI, 4L80E trans
Thanks, just trying to keep it simple and not rednecking it either. I'm an ex-dealership mechanic and attended a 2 year vocational college in heavy truck/diesel mechanics. (way back in 1983) Worked in the dealership from 85 to 95. Also did work for a diesel/heavy equipment garage.


After a bit of searching here this morning I like the idea of just getting a couple motorcycle radiators for rear heat. There's a ton of them, used and in different sizes on fleabay. But I'm always open to other ideas...without spending a small fortune and creating engineering plans.
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Old 04-25-2022, 12:25 PM   #6
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boxed heater cores? get some Jegs heaters, they are made for aftermarket installs and are much nicer than original bus heaters under the seats..



you dont want a setup with pumps, etc.. how do you plan to keep the coolant hot when parked and camped? you'll need some type of auxilliary heater.. diesel coolant heater with its own fuel tank. and pump the coolant through your heaters.. unless this is just for driving... if thats the case just put a jegs heater on in place of where the original rear underseat heater was.. and duct it where you need the heat to be..
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Old 04-25-2022, 02:51 PM   #7
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Join Date: Apr 2022
Location: Rocky Mts, Colorado
Posts: 25
Year: 1994
Coachwork: GMC Thomas handicap shorty
Chassis: 1 ton, 3500 -duallies, Vandura
Engine: 350 CFI, 4L80E trans
Yes, this is just for driving, I'll have another heat source for boondocking.

I've not heard of Jegs heaters, I'll look at those and thank you !

===========================

edit/update: I just look at them online. OMG those are bomb. That's exactly what I want and decently priced as well. Am I too old to say, WOOT!
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Old 05-10-2022, 03:14 AM   #8
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A salvage yard with school buses will have plenty of heaters.
I use a single under seat heater in my bus...works well.
It had 2 but one is enough.
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