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| My 1988 LFX F40 build. (Page 38/68) |
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Daryl M
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JUN 26, 02:37 PM
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Joseph Upson
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JUN 27, 10:18 AM
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What is the coolant flow direction on this motor? I am asking for clarification because I do not know. I just read in a swap thread on a different forum that the coolant inlet is at the thermostat housing and the flow direction is reversed going from rear to front. I'm looking for confirmation on this. [This message has been edited by Joseph Upson (edited 06-27-2020).]
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Daryl M
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JUN 27, 02:51 PM
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Joseph, the flow leaves the engine on the passenger side and returns on the driver's side at the thermostat. The photo of the fittings are at the thermostat housing. There are 3 small diameter hose fittings in addition to the radiator hose. One goes to the radiator overflow reservoir . The other two are probably for the heater and something else. Any ideas on how to plumb the heater?
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Joseph Upson
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JUN 27, 04:13 PM
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What a headache. My car is rear wheel drive and has a different thermostat housing. It also has four ports not including the mount area for the block. I looked at my loose housing and it doesn't make much sense to me. If coolant flows into it, it does so from the top side of the thermostat, which means circulation of some sort is taking place inside the block in order to pass hot coolant over the thermostat element in order to open it to allow coolant into the block. The thermostat housing appears to be connected to a port that flows directly to the water pump through the block, as there is a rubber seal that internally seals the center inlet port from the housing to the block.
I have a little more insight from this discussion and looking into it more. So the coolant pipe attached at the front of my motor (heads) handles coolant from both of the cylinder heads. It's still confusing, because no coolant in means no coolant out, but it has to circulate to keep the pump happy. In this case, the housing has that center outlet sealed internally to the block and it is flanked by a large ported area, which suggests the coolant flows in a circular pattern on both banks of the block, from rear, to pump via the center internal block passage, to the pump and to the block and cylinder areas, on the way back to the rear end of the block. When the stat opens, coolant starts to flow through the heads, out to the radiator. That's what I gather at this point, but I know nothing about the metering to the heater core, but know my housing is swiss cheesy like and accommodates it some how.
This will have to be drawn out because my setup is like spaghetti. The 08 CTS also has an auxiliary water pump in the mix to add more hoses and connection points.[This message has been edited by Joseph Upson (edited 06-27-2020).]
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Daryl M
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JUN 27, 07:29 PM
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This photo shows the short cycle line to heat the thermostat.   1 5933004460182559560585440948302.jpg[/img]
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Daryl M
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JUN 27, 07:32 PM
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Joseph Upson
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JUN 28, 09:52 AM
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Thanks for pointing that out, it's not easily seen hidden beneath my intake and cover arrangement. It definitely solves my coolant access for turbocharging going forward.
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msweldon
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JUN 28, 11:30 AM
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Daryl,
Double check your hose outlet to your overflow tank connection. On my LF3 thermostat, which only differs in the fact that mine has an integral coolant temp sensor, the right most outlet, which you have connected to the overflow tank, is in fact the heater line and the over flow outlet is the one in the center.
I'll double check...[This message has been edited by msweldon (edited 06-28-2020).]
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Daryl M
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JUN 28, 05:40 PM
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Msweldon, you are probably right. Thanks for catching that. So, what are you thoughts on heater hose routing. Can I run flow backwards through the heater core without problems?
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Daryl M
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JUN 28, 06:00 PM
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Msweldon, does this look better?
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