Engine..."underheating" ??? - Club Touareg Forums
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post #1 of 11 Old 02-14-2017 Thread Starter
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Engine..."underheating" ???

Hello everyone..

I have a strange situation happening on cold days especially. While driving at a steady speed like on the highway, the engine coolant temperature begins to drop as indicated by the gauge on the instrument cluster. As I understand, when the engine is at normal operating temperature, the gauge needle should be pointing straight up to 90 (C), right?

I immediately thought I might have a bad thermostat, or a bad sensor somewhere, or could be a bad gauge!!

Any thoughts, ideas, suggestions?
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post #2 of 11 Old 02-14-2017
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You can use VCDS to monitor (chart) temps.

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post #3 of 11 Old 02-14-2017
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Not a weird problem at all.

Bad thermostat. Becoming very common. It seems like it will eventually be 100% failure of the factory thermostats in the T1.

The spring part of the thermostat is getting weak. The pressure from the water pump is now stronger than the spring. IE. When you are running down the road, the thermostat will not completely close.
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post #4 of 11 Old 02-14-2017
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The tstat stays closed till 220 Deg F (assisting in warming up engine) then the spring shrinks and opens up, to allow the fluid to completely circulate and cool engine/fluid and maintain 220 deg.

Probably tstat. Charting it will narrow it down.

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post #5 of 11 Old 02-15-2017 Thread Starter
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Thanks guys.

I don't have VCDS, but I'm leaning more towards the tstat.

I used to have a 1977 Plymouth Volare with a 318 V8 and replacing the thermostat on that engine was something a first grader can do. I know, I'll research how to replace the tstat on the Touareg, but in general, how hard is it do it without having to take it to the shop?
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post #6 of 11 Old 02-15-2017
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Can't see on my phone which model or what engine...
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post #7 of 11 Old 02-15-2017
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^^2005 V6 Noobyy
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post #8 of 11 Old 02-15-2017
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I think it's buried under a bunch of stuff, but if you're handy with tools and aren't afraid to dive in, it's something a shade tree mechanic can handle. But no, sadly it will not be as easy as your 77 Plymouth. Ha ha!

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post #9 of 11 Old 02-15-2017
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From just jumping over from the "overheating" threads, it seems bleeding out the air is the main reported problem with opening up the system...you need a special tool for this apparently (never done it myself). The water pump might be the easy part compared to the "air bubble" issue...

I might do the thermostat then take to dealer for pressurized coolant flush (need one anyways based on age), I would think that would get the air out...plus it is like $150 or so... where I live anyways.
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post #10 of 11 Old 02-20-2017 Thread Starter
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I just had the coolant replaced at a specialized VW\AUDI\PORSCHE independent shop and I think they use the same servicing methods as the dealership. I was having the engine mounts replaced and thought I might as well take the opportunity to replace the brake fluid and coolant since it was about time to do that. The indication of the temperature on the gauge was happening before I replaced the coolant and still is.
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