Coolant bottle placement

[charleslabri]

Anyone done a air->water conversion give me a pointer as to where the coolant expansion bottle should sit?
I find examples of the waterboxer specific (with the coolant tower, etc), but no generic 'where this should sit'.

My gut tells me it should be on one side (maybe the hot side) of the radiator feed lines, but honestly, im looking for some direction where it would lie in the flow.
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[Vanagon Nut]

I assume this is in reference to your 2.0 TDI install. That info may be relevant? Maybe that info is in your sig.

On my air cooled to 15º ABA conversion, I installed my round shaped VW coolant bottle at RH forward corner (passenger side) of engine bay. I've read that locating bottle as high as possible, is best. (so inlet is as high as possible). On my WBX to 50º ABA, bottle is in the same location. In each case, I made a bracket to hold the bottle.

With a heat shield on exhaust manifold and a more or less straight down down pipe(s) design, it may be that the bottle could be mounted at the LH forward corner w/o risk of manifold heat damaging the bottle.

Andrew who did the 1.8T CCW conversion seems to favour using a flatter style VW coolant bottle.

If I were to do a conversion using an IC, and could source a small enough air cleaner, I'd be curious to see if there would be any room advantage to mounting the coolant bottle and air cleaner at area in front of a tail light.

Neil.
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1981 Westy DIY 15º ABA

1988 West DIY 50º ABA

VE7TBN

[charleslabri]

You are the perfect dude to ask this-
Its not where in the engine bay, its where in the coolant flow should this bottle capture coolant from?

(yes this is from my 2.0 conv).

Should this coolant bottle be fed from a T off the hot side of the engine to radiator feed?

engine -(hot)-->|--->radiator--(cold)-->engine
.......................|
.......................|
..................coolant
...................bottle
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[Vanagon Nut]

[charleslabri]

nice find.

So from what I can see there, i need to add a junction that takes:
input to coolant bottle top from
1. heater core hot side pre and post exhaust gas recirculation
2. intercooler charge air cooler hot side

and output from lower bottle to
1. main coolant cold input to engine
2. intercooler charge air cooler cold side

are those lil inline things on these lines in this diagram 1 way check valves? Are they bleed valves? i dont see a legend here
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[Wildthings]

On a WBXer the expansion (pressure) tank is on the suction side of the pump, which is why the level draws down when you rev the engine, this makes the system easier to bleed. On my Subivan the tank is on the pressure side of the heater loop and I find it aggravatingly hard to get the system to bleed. I want to go back and replumb the tank so it is on the return side of the heater loop and not the pressure side.

[Vanagon Nut]

That PDF has more on the coolant circuit. There appears to be 3 different coolant modes; "three partial coolant circuits". They appear to involve re routing of coolant as needed.

I bet those inline things are valves that control coolant flow as required for each different circuit.

That engine has a "switchable" coolant pump.

This is starting to get "above my pay scale"

Neil.
_________________
1981 Westy DIY 15º ABA

1988 West DIY 50º ABA

VE7TBN

[charleslabri]

[charleslabri]

yp check valves
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[Vanagon Nut]

My pay scale has increased slightly! LOL

I'd thought those valves might be controlled by ECU or other computer but I don't see mention of that in that PDF e.g. in the "Actuators" pic. And looking closer at the image, they appear to be drawn as a ball/spring assembly.

The main work for the 3 modes of coolant path routing seems to be done by the cylinder head coolant valve N489, the switchable coolant pump and of course the thermostat.

I don't know if a "silicate container" is standard in all the VW coolant bottles but I do see that in the 2.0 TDI.

Neil.
_________________
1981 Westy DIY 15º ABA

1988 West DIY 50º ABA

VE7TBN

[Zeitgeist 13]

Doesn't Greg's kit include all the cooling items?

Also, are you plumbing the IC to the engine coolant circuit?

I plumbed my ALH exactly the same as it was in the Mk4 donor, except I deleted the EGR cooler. My IC has its own dedicated cooling supply, which really helps keep the EGTs down.
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Casey--

'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik?

[charleslabri]

turns out gregs kit handles the coolant bottle lines. I just didnt see the hoses until i cranked it out of the box and mated to the trans today.
So in my case at least, this is not a concern
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