I have an old circulating block heater that I would like to install as a "booster" heater. Everyone says that I should install this thing as LOW as possible.

Where on my 300SD should I put this? inline on the lowest part of the system, or PHYSICALLY lower, by mounting the heater on the frame rail and running hose UP to the rest of the cooling system? On one end is marked "front" I'll assume that is to be interpreted as OUT. This unit is from an OLD Jaeger diesel portable compressor.

Attached Thumbnails

 

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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FACEBOOK: PANZER450

I can't tell from the picture how big the thing is. Small, it goes in a heater hose (perhaps the line going through the aux water pump, as there's room for it); large, it goes in the lower radiator hose.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

It has barbed hose connections on it so it goes inline of a heater hose. It's about 6 or 7 inches long and about 3" in diameter, and weighs almost nothing.

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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FACEBOOK: PANZER450

my car had a webasto on it,and it was mounted inline between the head and the heater core. they added about 6 ft of hose to it, so the actuall unit was on the drivers fender, just aft the washer reservior.

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make sure that you purge all bubbles from the lines. most manufacturers recommend driving the car a day or two befor even plugging in there units.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

As long as it is a circulating heater (ie has a pump to circulate the coolant), I think the location is irrelevant. The ones that have to be installed low are the ones that rely on gravity for circulation like the lower radiator hose heaters.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

I looked up the patent on the internet and it said this :

"The heater 10 is most conveniently installed in a horizontal position, as this position usually involves little or no sharp bends in the connecting hoses. In addition, the heater 10 should be installed at about the upper level of the coolant in the engine block. If the heater 10 is installed too low, the coolant tends to circulate continuously by convection and the desired vaporization does not take place to the same extent. It is conceivable that the heater 10 could be installed vertically, with the inlet at the top, but this is not as desirable as the horizontal position in most automobile installations because the heater hose to which connection is made is most frequently horizontally disposed In most cases the installation of the heater 10 simply entails cutting the hose leading from the water pump to the interior heater and attaching the cut ends of the hose to the respective bosses 28 and 36, with the hose leading from the water pump connected to the outlet of the heater 10. The hose should be raised to at least the level of the top of the radiator to avoid loss of coolant. Hose clamps can then be installed to secure the hoses on the bosses 28 and 36. The engine should then be idled for several minutes to fill the heater 10 with coolant. Alternatively, the heater 10 could be filled with antifreeze before installation. "

I tried tonight to install it and the only place I could find for it to fit was inline of the heater hose that goes TO the heater core. Because I have my servo box and waterpump bypassed. Hot side going INTO the heater core and the cool side coming from the engine. I'm afraid to plug it in due to all the "fire" stories I hear about these heaters being installed incorrectly, so I'll take it to work tomorrow and plug it in at work and keep an eye on it to see what it's doing...

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

____________________________
FACEBOOK: PANZER450

Here's the full link if anyone is interested

Circulating Coolant Heater

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

____________________________
FACEBOOK: PANZER450

With images...
http://www.google.com/patents?vid=USPAT3626148&id=QJUCAAAAEBAJ&dq=3,626,148&jtp=1

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-justin

1987 300TD, 1987 300TD
2008 R32, 2000 Passat Wagon

Yes! thank you!!
well, I've gone over it and in theory, it shouldn't matter how it's mounted, just so long as the outlet side is in the direction of flow.

__________________
RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

____________________________
FACEBOOK: PANZER450

Will this still work if the monovalve and auxilliary pump are still in the car?

Yes, default position (power off) to the monovalve = open. The aux pump would cause minimal resistance to the flow.

I just have a lower hose heater on my car, and it works great. In fact, it is plugged in right now, because the low tonight is TWO DEGREES It was 13F this morning and it fired right up having been plugged in overnight, engine heaters are awesome!

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)