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  #1  
Old 01-04-2005, 10:48 AM
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Question coolant & heater core flow question

300TD, 617 engine I think...

The heater hose that comes out of the head by the oil filter & IP pump...

Is this the out flow from the block and into the heater core? I want to use this to supply hot water for my WVO conversion.

HOWEVER, I disconnected the hose at the fire wall and ran the engine. No water flows out of this hose at idle. I have to rev the engine before any water will flow. as soon as I return to idle the water flow stops.

Is this normal?

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5
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  #2  
Old 01-04-2005, 11:15 AM
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Quote:
Originally Posted by odie
300TD, 617 engine I think...


HOWEVER, I disconnected the hose at the fire wall and ran the engine. No water flows out of this hose at idle. I have to rev the engine before any water will flow. as soon as I return to idle the water flow stops.

Is this normal?
That is why the car has an aux water pump-to ensure flow at idle. But when you disconnect the hose at the block, flow through the heater plumbing is eliminated, and the aux pump will go dry. Assuming that it works, of course.
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  #3  
Old 01-04-2005, 12:33 PM
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When I bought my jalopy wagon, in between the block and the firewall there was a manual water cutoff installed inline. Of course the knob was broken off, so I have never messed with it. However, wouldn't there need to be 2 valves to isolate the flow away from heater core,one on either side, or does it just go through the 1 hose. I don't see how flow could be created that way, or how blocking the flow would work the other way.
Make sense?
Is there a coolant flow diagram somewhere that I cant find.
Jimmy

**edit**
Would the aux pump be the other closed end of the heater core flow? I'm at office and can't go look at my wagon.
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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

Last edited by JimmyL; 01-04-2005 at 12:43 PM.
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  #4  
Old 01-04-2005, 12:49 PM
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On the turbo 617 the aux pump is down low on the passenger side, kinda towards the front. It may not be the same on earlier 617's with the servo type climate control though, in fact, I'm not even sure if that system has an aux pump or not.
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2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

Last edited by Palangi; 01-04-2005 at 01:15 PM.
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  #5  
Old 01-04-2005, 01:10 PM
JimmyL's Avatar
Rogue T Intolerant!!!
 
Join Date: May 2004
Location: Sunnyvale, Texas (DFW)
Posts: 9,675
Luckily I do not have the "Evil Climate Control Servo". My aux pump is passenger side next to wheel well. It also was/is unplugged. Does that close any type of valve by default when no power is applied. Is that the other end of heater core flow?
Questions, questions, questions...
Jimmy
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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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  #6  
Old 01-04-2005, 01:13 PM
Palangi's Avatar
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I have heard it said that if you're gonna disconnect it, you are better off to take it out and replace it with a hose, so as not to restrict the heater core flow at idle.

Edit: Must be a slow day at the toner mine ?
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Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE
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  #7  
Old 01-04-2005, 02:23 PM
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I've bypassed the aux pump & heater valve because there can be no circulation without turning on the car heater. I don't always want heat inside the car, but always want heat in the fuel/WVO line.

I'm planning to put a "T" between the aux pump and water pump and run a line to another "T" just before the heater core inlet...

That way I will always have coolant flow for my heated fuel line above idle speeds and The car heater will still work too. either way, coolant from the head outlet hose must always go throught the hose-in-a-hose fuel line first, then either go back to the water pump or go through the heater core next.

__________________
1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5
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