How to block your front grill with pipe insulation

993cc

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May 2, 2006
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Ottawa ON, Canada; Paul Smith's, NY, USA; Amherst
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2003 Jetta Tdi Wagon, Bought September 2009 with 60,000 Km on the clock. Died September 2013, at 142,000 km. in a collision with a moose. 2006 MklV BEW Jetta wagon Bought October 2013, 136,000 Km.
The snow screen may be plugged up with bugs and other debris as well.
I cleaned out the snow screen last summer, so I hope it's still clear. Still worth mentioning though.

I'm pretty sure the problem was the foam blocking off the intake grill above the radiator/under the hood. When I relocated the foam, the problem went away.
 

steffen707

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Dec 7, 2005
Location
Central Wisconsin
TDI
01 Jetta GLS TDI
Just wanted to let you guys know, yesterday I was towing my 5x8 trailer which has 4' plywood walls, so its a giant cube. I was driving about 55-60mph on the highway in 4th gear, and noticed the temp on my ultra gauge climbed to 235. I pulled over pulled out the foam from the top grill, got in the car, it was already 220deg, got up to speed on the highway and it dropped to 188 within 20-30 seconds.

SO, this totally works at blocking airflow to the radiator. Great for normal driving, never noticed it go above 195ish, but when towing obviously the engine is working harder, and its super easy to take the foam out. I bet I could have taken just one side of the 4 out and it would have come down quickly.

Next I need to block the VW badge, as I bet that's letting in a lot of air.
 

TDI2000Zim

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NJ
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VW hat meinen '14 Passat TDiSE getötet.
It's that time of the year again, when plummeting temperatures send us scrambling to dose our fuel and crank our seat heaters to 11. Ever wanted to block off part of your radiator to help your engine warm up faster? It's very easy to do and can help you get better fuel economy, perhaps lower engine wear but most importantly get heat to the passenger cabin faster. This is very easy & cheap, but I thought some of the less imaginative or mechanically inclined may benefit from some pictures. This was done on my 2006 MkIV Golf TDI.

Go to your local hardware store and buy 3 meters (9') of foam pipe insulation for 13mm (1/2") copper pipe (or 10mm iron pipe - pipe sizing is weird, but pipe threading is even weirder). I found it at my local Menards for the whopping sum of $1.64. Menards is a midwestern chain of giant hardware stores, kinda like Home Depot or Lowes, but without all the suck. The pipe insulation usually comes in 2 meter lengths (6') but for some bizarre reason, it was in a bag of four (4) one meter lengths. Whatever. It costs less than $2 total and more than you need.



Note that this is dark grey, which blends in better. Sometimes it is brown or black. It will still work fine. Don't worry. Have a homebrew. Also notice the package is half French. That's because this stuff was hecho-en-Canadia.

Take out a piece of it and notice there's a slit down one side. That's how you would put it around a pipe. And that's how you're going to put it on your grille. Open up the slit by running a finger down it:


Then slide it in place over a slat in your upper grille, and trim to length with your pocketknife:


Repeat three times, and the upper grille is done.


Give it all a nice push to get it settled in there.

Now do the same thing on the lower grille slats. Don't bother with the bottom-most as it doesn't actually go through.

But before you slide those in place, I like to cut some slits to match up with the vertical grille bits, shown below.


Those help it sit nice and far back into the grille openings and block out that awful cold air.

Do that for both lower grille slats and you're done, honkey.


It may seem a little flimsy but I've never had a piece become dislodged for any of the past 3 winters.

Enjoy!

scurvy
Bump for cold Passats with low mpg caused by the unusually low temperatures this 2012-2013 winter.
 

Jolee

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May 8, 2011
Location
mississippi
TDI
2002 golf
While you guys are on the subject of reducing air flow to radiator, with the temp around 40 or lower, my temp guage will not climb over 170... 75-80 MPH for and hour, (yes, we will often speed in Ms).. i know i potentially have heater "door/ mixer" issues as i have been getting a steady supply of foam for ducts for months. Control position seems to work as it should.But inside heat is very low to non-existent. As tackling dash removal is my last choice, could i have improper antifreeze ratio or a bad theromstat?
 

77 K20

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Whitefish, MT
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2011 Touareg TDI LUX
I'd say a bad thermostat. I had the same issue- running around 165-170 and after I replaced it the car gets up to 190.
 

scurvy

Good Ol' Boy
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Location
Chicago IL USA
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2006 Golf
Bump for cold Passats with low mpg caused by the unusually low temperatures this 2012-2013 winter.
Can you please edit your one-line post to remove the full quote of my original post? It's silly to have six pictures and several paragraphs of text quoted and only put one line below it.

While you guys are on the subject of reducing air flow to radiator, with the temp around 40 or lower, my temp guage will not climb over 170...
Classic lazy thermostat. Same thing happened to mine this year... despite the dash idiot gauge showing 90ºC, my SGII wouldn't get above 77ºC. Replaced it and I now build full coolant temperature quickly.
 
Last edited:

red golf tdi

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Minneapolis,MN
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1999.5 Golf Red
I'd say a bad thermostat. I had the same issue- running around 165-170 and after I replaced it the car gets up to 190.
I agree. If the thermostat is functioning there's no need for blocking the grill off.....the TDI thermostat doesn't open in cold temperatures (lower radiator hose is ice old even after a 50 mile drive), so to block off the grill is really only blocking the cold air from going through an already cold radiator. :)
 

steffen707

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01 Jetta GLS TDI
I agree. If the thermostat is functioning there's no need for blocking the grill off.....the TDI thermostat doesn't open in cold temperatures (lower radiator hose is ice old even after a 50 mile drive), so to block off the grill is really only blocking the cold air from going through an already cold radiator. :)
So 19 pages of discussion of people saying their cars warm up faster with the grill blocked means all these people are imagining this?

You see trucks with cardboard strapped to their grills all the time. Are they also doing this for no reason?
 

scurvy

Good Ol' Boy
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Location
Chicago IL USA
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2006 Golf
I agree. If the thermostat is functioning there's no need for blocking the grill off.....the TDI thermostat doesn't open in cold temperatures (lower radiator hose is ice old even after a 50 mile drive), so to block off the grill is really only blocking the cold air from going through an already cold radiator.
Maybe I'm seeing it differently, but that's not how I parsed this post:
I'd say a bad thermostat. I had the same issue- running around 165-170 and after I replaced it the car gets up to 190.
I understand 77 K20's post as agreeing that Jolee had a bad thermostat. Which I agree with. My Golf did the same thing when the thermostat got lazy and was opening too soon.

While I would agree that there is no need for blocking the grill off (just as there's no need for a Frostheater ;) ), the car does warm up and provide usable heat faster with the grill blocked off than it does without.
 

streeker02

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Halton Hills
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2003 Golf TDI
I agree. If the thermostat is functioning there's no need for blocking the grill off.....the TDI thermostat doesn't open in cold temperatures (lower radiator hose is ice old even after a 50 mile drive), so to block off the grill is really only blocking the cold air from going through an already cold radiator. :)
Ostructing airflow to the raditator will not result in quicker cabin heat in a TDI unless the thermostat is bad? You actually believe this?
 

77 K20

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2011 Touareg TDI LUX
Maybe I'm seeing it differently, but that's not how I parsed this post:


I understand 77 K20's post as agreeing that Jolee had a bad thermostat. Which I agree with. My Golf did the same thing when the thermostat got lazy and was opening too soon.

While I would agree that there is no need for blocking the grill off (just as there's no need for a Frostheater ;) ), the car does warm up and provide usable heat faster with the grill blocked off than it does without.
You saw it correctly- Jolee has a bad thermostat, just like I did in the past. Once I fixed it it now warms up to 190* but will warm up quicker or stay at that temp longer when it is 0 degrees out.
 

TDI in MT

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none, sold it.
Here's my 03 Golf with a winter front from IDParts.com. Nice product; I just wish it came with pictures and/or instructions on how to install it.

The winter front comes with three parts - two on either side of the VW logo, and one below the license plate. The piece to the right of the logo does cover the air intake, but it somehow doesn't seem to make any difference.

 

steffen707

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Location
Central Wisconsin
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01 Jetta GLS TDI
Here's my 03 Golf with a winter front from IDParts.com. Nice product; I just wish it came with pictures and/or instructions on how to install it.

The winter front comes with three parts - two on either side of the VW logo, and one below the license plate. The piece to the right of the logo does cover the air intake, but it somehow doesn't seem to make any difference.

Sweet! I'm going to order one of these. Tired of the pipe insulation. IDPARTS.COM said they might have them in stock in a few weeks time.
 

mctdi

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Dec 10, 2004
Location
se WI
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2010 Jetta
I still don't know why I would want to block the air supply to my engine. My JSW seems to heat up fine without it, and I have heated seats.
Your not bocking, as in shutting off all air, but reducing the cooling air to the engine compartment. If one lives where it gets below zero and a good wind, stopped at a red light, without the grill guard, you can see the temp gauge drop.
 

steffen707

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Central Wisconsin
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01 Jetta GLS TDI
In cold states blocking the radiator heats the engine up faster, increases your MPG, make the cabin warmer faster.

There is a debate on this next point for Diesels, but in a gas engine, a warm air intake also warms the car up faster, and also increases MPG, because warm air is less dense, and thus less oxygen, so less gas is injected.

I tested this on my civic lean burn car, and it gained like 10% MPG. Put a snorkel on the intake pulling air right behind the exhaust manifold. That's a hyper-miler thing, and most TDICLUB people don't seem to care that much.
 

blazen71

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Oct 25, 2011
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Wiskullsin
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All Gone
Unfortunately I will not be doing the pipe insulation grill blocker this winter. Why ,you ask, I just picked up an OEM VW Winter front on Craigslist for $20 :D
 

2.2TDI

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TDI
⠀⠀
I just tossed on some pipe insulation today, temps have been around the 5 - 8 degrees C mark. My car is running around 80- 82 C according to scangaugeII and it was taking forever to warm up. After the pipe insulation it got warmer a lot faster but the car was still showing 81 C as the top temperature. How much higher should I expect coolant temps to be, if higher at all
 

VeeDubTDI

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That's still a little on the cool side. I think you've gotten some good feedback in your other thread regarding changing your thermostat.
 

D_Squared

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May 24, 2013
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Burlington, WI
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2012 Golf 2D 6M
It dropped below 32F and snowed today and my car took an extra mile or so to warm up so I decided this was a necessity. I can't wait to see the results that 6' of insulation and 4 zip ties can cause. Haha

 

Votblindub

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Dec 22, 2010
Location
NY
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MK4 Jetta Wagon
When blocking things off, do you guys find it necessary to insulate the radiator hoses and other coolant lines as well?
 

donlon152

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Sep 30, 2013
Location
Boston
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2012 Jetta
Dumb Question - in 2012 Jetta who can I tell my engine temperature? There is no display.

ps thinking about picking up insulation for the front this afternoon. Temps are 32 F in the morning consistently now.
 

solid19snake

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May 17, 2012
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Pittsburgh, PA
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2012 Jetta TDI 6MT (sold)
Dumb Question - in 2012 Jetta who can I tell my engine temperature? There is no display.
ps thinking about picking up insulation for the front this afternoon. Temps are 32 F in the morning consistently now.
In my 2012, I run the Torque app ($5) on my Android phone with the Bluetooth OBD-II dongle ($20 on amazon) to display the temperature.

IDParts said they're coming out with a winter front for our car soon, so be on the lookout. Similar to this I believe...
http://www.idparts.com/catalog/product_info.php?products_id=3930
 
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