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TDI Conversions Discussions on converting non TDIs into TDIS. More general items can be answered better in other sections. This is ideal for issues that don't have an overlap and are very special to swaping engines.

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Old September 7th, 2017, 11:05   #1
archemitis
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Default ALH coolant flow question

Sorry to ask such a seemingly easy question to answer, but... Which way does the coolant flow on an ALH? Thermostat routed to the lower radiator hose or upper? Thanks in advance. Every diagram I clicked on was a bad link.
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Old September 7th, 2017, 12:50   #2
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Tstat is on the lower hose. Coolant flows in there and out through the head to the top radiator hose...Hope this helps
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Old September 8th, 2017, 15:16   #3
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Thanks so much! I was pretty sure untill I saw a few conversions done backwards!
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Old September 10th, 2017, 04:16   #4
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Thanks so much! I was pretty sure untill I saw a few conversions done backwards!
yeah, and those guys will find out soon enough that when the coolant gets just a little bit low the water pump stops pumping
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Old September 10th, 2017, 07:47   #5
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It is still odd the way VW plumbed it
Normally the tstat is on the hot hose on top(relatively speaking)of the engine
Took me awhile to get my head around this, as there is a passage in the block where the coolant(hot) passes over the tstat
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Old September 10th, 2017, 19:30   #6
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It is still odd the way VW plumbed it
Normally the tstat is on the hot hose on top(relatively speaking)of the engine
Took me awhile to get my head around this, as there is a passage in the block where the coolant(hot) passes over the tstat
Having the thermostat at the lower hose is quite common in all modern-ish engines from all manufacturers. When the thermostat opens in this arrangement, the relatively low temperature coolant from low part of the radiator comes into contact with it immediately, causing it to shut sooner or at least not open as far as it otherwise would if it were at the upper hose. The effect is less drastic swings in engine temperature during operation. Emissions
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Old September 14th, 2017, 07:24   #7
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emissions, and far more stable operating temperatures. That gives you more consistent performance and makes it easier to tune
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Old September 16th, 2017, 15:08   #8
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Yep, I wasnt knocking it. It performs flawlessly.
Just for a small block ford guy this arrangment is kinda backwards

In winter with no coolant glow plugs and egr put to the lowest possible it struggles to stay in the 80s. As soon as it idles its 55-60 in about 3 minutes. I've thought about a temp jerry rig to move it to the top hoses and would if I knew it would make it a little warmer haha
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Old September 20th, 2017, 08:33   #9
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Get yourself a 92C thermostat and call it a day.. Napa part number ATM-143992K2 for a Calorstat brand, or ATM-TX1392D for Behr brand.

I have the Calorstat one in mine and it will run 197-204F on my Torque app on the highway even when it's -15F outside..
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Old September 20th, 2017, 08:41   #10
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Quote:
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Yep, I wasnt knocking it. It performs flawlessly.
Just for a small block ford guy this arrangment is kinda backwards

In winter with no coolant glow plugs and egr put to the lowest possible it struggles to stay in the 80s. As soon as it idles its 55-60 in about 3 minutes. I've thought about a temp jerry rig to move it to the top hoses and would if I knew it would make it a little warmer haha
Veeeery common for these thermostats to stick partly open or start opening early as they age... The location is fine, you may have a weak t-stat.

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