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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old December 18th, 2008, 15:58   #31
Zero10
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So for those doing this mod, do you need both 1/2" and 3/4" insulation? Or is it just one or the other?

Hoping if I stuff the grill on my golf my frost heater will do a better job of keeping the engine warm with these northerly winds we have been getting lately. Quicker warmup would be another great plus too.
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Old December 18th, 2008, 19:59   #32
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Quote:
Originally Posted by Zero10
So for those doing this mod, do you need both 1/2" and 3/4" insulation? Or is it just one or the other?

Hoping if I stuff the grill on my golf my frost heater will do a better job of keeping the engine warm with these northerly winds we have been getting lately. Quicker warmup would be another great plus too.
Whichever is cheaper/comes in the darkest colour
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Old December 19th, 2008, 15:57   #33
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So they both fit well then. Cool, will pick some up tonight and stuff the grill tomorrow Thanks!
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Old December 20th, 2008, 12:06   #34
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this may be a stupid question but isnt the job of the thermostat to prevent the coolant from entering the radiator untill the engine is warm?

if that is the case then how would this benefit warm up times.


it would make more sense to me if the thermostat had been removed in these cars.
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Old December 20th, 2008, 12:14   #35
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I think you mean eliminating the radiator all together, otherwise removing the T-stat would only make warm-up time much much longer. I would leave the cooling system as is, and possibly blocking off the air to the radiator if the ambient is that cold.
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Old December 20th, 2008, 15:17   #36
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This blocks the cold air that comes through the radiator and over the engine. Also, some heat is transferred across the thermostat through conduction. This helps to reduce the cooling of the fluid on the other side of the thermostat heated by this method and will also help keep the engine warm this way.

I blocked 3 of the lower vents today before my hands got so numb I couldn't cut or stuff the foam any more. Gonna stuff the last lower one and 2 of the upper vents later, but with even just the bottom 3 blocked warmup is noticeably quicker.
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Old December 20th, 2008, 17:36   #37
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jbo5 basicly what i was trying to say is wouldnt it be wasted to cover the front if the thermostat is in place but zero 10 cleared it up for me. kinda common sence when i thought about it.
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Old December 20th, 2008, 19:21   #38
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I put the foam in my grill a few weeks ago, and I have to say that it was the best $3 I've ever spent on my car.
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Old December 20th, 2008, 19:26   #39
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Quote:
Originally Posted by shagin'wagen
I put the foam in my grill a few weeks ago, and I have to say that it was the best $3 I've ever spent on my car.
That can be taken so many ways post your results shagin. Warm or not?
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Old December 20th, 2008, 19:57   #40
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Quote:
Originally Posted by Bosley
That can be taken so many ways post your results shagin. Warm or not?
Yes, warm. Before, the car would take quite a few miles to get warm, say 10 minutes of driving worth. Now it is more like 5. It's been hovering around -30*C here for over a week and doing the mod is well worth it.
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Old December 21st, 2008, 14:03   #41
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Thanks for this mod.

For me it works wonder !!
never my tdi as stayed warm while city driving..now she does :P
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Old December 21st, 2008, 14:14   #42
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I filled in all but the top radiator vent and the air intake vent today. It was basically no different from only having 3 of the bottom ones blocked. I was hoping for the same margin of improvement again. None the less, excellent mod and well worth the 20 minutes and $5 worth of foam and zip ties it cost me

For anybody else working on this, I picked up 2 6' sticks of 1/2" pipe insulation and it did the lower 4 slats and 2 of the upper ones. I still have 1 6' stick left but it definitely won't take all of it to block the last 2 sections.
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Old December 24th, 2008, 07:35   #43
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Here is my pipe insulation front.

Works very well, better than I would have thought.

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Old December 25th, 2008, 07:15   #44
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I would not be afraid to cover the whole thing. My 08 F350 has a heavy quilt grill cover from FIA on it, and no air gets in unless it comes from under the truck or leaks around the hood/grill. Big trucks always run like this, and no issues. How could the Jetta be any different? I like the idea, and will go to the store tomorrow to get some foam and do it...but I will cover all the holes and use zip-ties as I run though the car wash quite often.
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Old December 26th, 2008, 11:38   #45
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It works well indeed. Home Depot only had the gray stuff for me too, unless I wanted to jump from $2 each to $7.50! So I have gray to match the silver . Cut the slits in the foam where the supports on the grill are, and the foam fits very nice.

I was ready to scream...the VW circle on the grill popped out! It only clips in place like a pop lid with a 10* turn. I may have to glue that in as it seems an easy theft target and probably costs $100 from VW.
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