MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: Meallbhan on December 07, 2013, 05:39:12 pm
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As posted on here probably thousands of times over the years, I have the slow warm up time on my GTI in the winter months. Last year, and the year before, I changed the thermostat and a temp sensor. Guess what?, it didn't work.
This year, it's still annoying me so I'm wondering if a quick DIY fix may help for a few months, then I can remove it. I'm thinking of doing what they do in ice road truckers, and putting something in front of the radiator, maybe just partially covering it.
The car is slow to warm up in anything under about 12 deg and it isnt likely to be above that for a while up here in Inverness, so what do you think? Is this a bad idea, very bad, or maybe worth a try?
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What year and gearbox does it have?
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Its a 2005 with a manual gearbox
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Ok.
On your car there is a second thermostat (if you had dsg there would be two).
See my post here http://www.mk5golfgti.co.uk/forum/index.php/topic,75756.0.html
If you are confident that your main thermostat is good (ie you tested it before fitting and it's genuine) then I'd test/replace the bypass thermostat in the turbo cooling line. Pic in the other thread.
Will.
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Thanks Will, I just had a quick read of your thread and its refreshed my memory a bit.
I think I'm going to replace part 20 or 21 in diagram 121-030 of the ETKA link in your thread. The coolant regulator in the turbo line. Hopefully that will be the culprit, just got to find it in the actual car now.
I swore I wouldn't get into this again . . . but its so infuriating.
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Yep, the coolant regulator is the bypass thermostat. It's in the vertical pipe that comes up from the aux coolant pump under the inlet manifold. The regulator is positioned behind the left cooling fan, as your standing at the front of the car.
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Thanks, I'll have a look tomorrow and see if I can find it.
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I just had a look for the regulator. There is a solid pipe that exits the radiator on its top left corner (looking from the front of the car) then goes neatly down the side of the rad until about half way. The pipe then kicks out at 90 deg but also at 45 deg where there is a bulge in the still solid pipe, here it turns into the usual soft rubber pipe. Im assuming the bulge is where the regulator is housed. If this is the correct pipe, how on earth do you swap over the regulator? I can bearly get my hand in to touch it. Also, does all the coolant have to be drained or can the flow be stopped then topped up? Thanks.
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I just had a look for the regulator. There is a solid pipe that exits the radiator on its top left corner (looking from the front of the car) then goes neatly down the side of the rad until about half way. The pipe then kicks out at 90 deg but also at 45 deg where there is a bulge in the still solid pipe, here it turns into the usual soft rubber pipe. Im assuming the bulge is where the regulator is housed. If this is the correct pipe, how on earth do you swap over the regulator? I can bearly get my hand in to touch it. Also, does all the coolant have to be drained or can the flow be stopped then topped up? Thanks.
Am also tackling this job!! I have a DSG and have located / check one. The next one to the front of the engine is hiding behind the throttle body hard pipe. I believe ITGUY :notworthy: removed this for access, check his photo in his posted link (page 3, second photo) it is hiding but defiantly there :fighting:. Hope that helps
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I'll nip out and take photos
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Its not the thermostat under the intake manifold, the one that connects to the outside of the block at the front, I did that one last year and had to remove the alternator for access. The one I want to remove is inline in a pipe but cant get a hand to it. Its not infront of the left fan but to the left of it at the side.
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You need to take the main large pipe off the throttle body/intercooler to get at it.
Just to make sure you're looking in the right place...
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fa171%2Fwlegge%2F1CF22B92-9A27-4DAF-97F7-D542E0D6FBE2.jpg&hash=d114beab54bf666fdf5e9b89adb9f7c7c75f066e)
It's right in the center of this photo, you can just see the top of the hose clip for it
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fa171%2Fwlegge%2FB02CCB12-2AB8-46E7-8FE5-9CCE45D4418F.jpg&hash=03c4a7fbb32fe821bed409113c5381324b46aabc)
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I think we're talking about different parts. The one I want to get at is no where near the throttle body. On you second photo, its just out of picture on the bottom left. To the left of the rad, about middle.
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Ok I've no idea what the part is you're looking at then!
Which part do you think it is on here?
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fa171%2Fwlegge%2F25B7BDF3-3248-4DA3-9156-BDC3BEF01781.jpg&hash=13f1d867a8bb0380032cb0f2410f62939618e2e7)
Can you see it on this photo?
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fa171%2Fwlegge%2F2A733B46-3F0A-4DFF-84E0-7FC418F7DBDF_1.jpg&hash=6583c03fb0da619d4af90c432f554559b0775117)
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I think it might be part 3 but I cant see it on the photo. I have a solid plastic pipe coming off the top left corner of the rad, it then runs down tight to the left side of the rad til about half way down. Then there is a bulge in the pipe where I think the internal inline regulator is fitted. Here it branches off at 90 degrees and also at 45 degrees. The pipe looks like it may split coz the is a metal spring clip in it but I cannot get my hand to it. All this is on the left of the radiator.
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Interesting, it sounds like it is the regulator/ bypass thermostat but it isn't in the same place as mine then.
Silly question but it is a UK spec car?
This diagram shows the hose layout of an early 05 car. The thermostat is no 6
http://volkswagen.workshop-manuals.com/golf-mk5/index.php?id=5039
On this diagram of the radiator I can only see one take off from the left hand side (standing looking at the car from the front) and that connects to the main thermostat on the engine block???
Is your rad different?!
We are talking about a 2.0T gti with an AXX block aren't we?!
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Yes its a UK spec car and as far as I know the rad is the standard one. 2005 GTI manual AXX block.
I had a look at the link above but it doesn't make a lot of sense to me. I took a pic of the hose in the car and have circled the part, but do I need to put the photo to photobucket (have an account) to be able to post it here?
Parts I have changed are the the thermostat which is inside a big housing that bolts to the block under the inlet manifold, part no V06F121111F. And the Temp sensor above the gearbox on the right of thr engine as you're looking from the front, part no 06A919501A. So there should be one left, the inline one on the turbo hose. Correct? This one, part no 4E0121113, and (I think) is where I've described.
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Right here's a pic hopefully.
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2F%5BURL%3Dhttp%3A%2F%2Fs46.photobucket.com%2Fuser%2FMeallbhan%2Fmedia%2FMobile%2520Uploads%2F2013-12-08173835.png.html%5D%5BIMG%5Dhttp%3A%2F%2Fi46.photobucket.com%2Falbums%2Ff135%2FMeallbhan%2FMobile%2520Uploads%2F2013-12-08173835.png&hash=cf36099885a89bdbad8536bcdb4e6be94b9a9e2f)[/URL][/img]
Inside the circle there is a silver bit. It's not that. It's the black bit directly underneath/behind it. The photo it taken looking down the back of the very left side of the radiator. Looking down the side of the engine, alternator and ac pump. I was stood at the front of the car.
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WTF?
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fixed
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fi46.photobucket.com%2Falbums%2Ff135%2FMeallbhan%2FMobile%2520Uploads%2F2013-12-08173835.png&hash=7bb86d5db09c2f5e325eb46a41ec8f44639aa40a)
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Thank you!!
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That is not it. I don't know what that is but the item you want is behind the left half of the rad in a vertical rubber pipe as described by itguy.
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Ahh ok
They are the Aircon pipes coming off the Aircon radiator.
As said, the one you need is in my photo above, it's in the vertical rubber hose behind the left rad fan.
It's low down though so you need to look hard or from beneath with the drip tray removed
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I'll have another look tomorrow.
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Ironically for the first time in 3 years I have noticed some odd temperatures on the gauge.
The car has always raised to the 90 mark within a few miles and stuck there rigidly.
Today whilst driving around noticed the temp falling and struggling to stay at the 90 mark.
No coolant leaks
Fans working
MPG normal.
When I got back let the car cool then let it run on the drive and it sat at 90 again un moved.
Very odd.
Thermostat?
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Meallbhan what you were describing and photographing is an air con pipe think you mixed it up the bulges are where the metal and rubber connect and the joints are all solid.
Wolf burger. You have described the common symptoms of the main thermostat mate. As a general rule if the temp drops once it reaches 90 it's the main thermostat.
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Cheers HJ
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Meallbhan what you were describing and photographing is an air con pipe think you mixed it up the bulges are where the metal and rubber connect and the joints are all solid.
The pipe I'm describing is under the aircon pipes and under where the metal and rubber pafts join, you can just make it out. It a fat black pipe, circular part uppermost, it has rubber water pipe on either side of it. The part circled is solid and looks like it houses something.
I'll try and put another pic up later of looking down the back of the radiator like itguy is describing. There is a vertical pipe that is rubber, it has a bend on the top. Each end of the pipe turns to a metal joint then pipe and one end of it goes under the intake manifold I think. If this is the pipe in question, I don't see anywhere where an inline temp regulator could be housed. I do in the other pipe. I'm confused.
When my phone is charged I'll nip out and get a photo, I may need help again posting it!
I
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Heres one of the pipe infront of the radiator, where I've circled is the end that goes under the intake manifold.
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2F%5BURL%3Dhttp%3A%2F%2Fs46.photobucket.com%2Fuser%2FMeallbhan%2Fmedia%2F2013-12-09184412.png.html%5D%5BIMG%5Dhttp%3A%2F%2Fi46.photobucket.com%2Falbums%2Ff135%2FMeallbhan%2F2013-12-09184412.png&hash=bbd4c78ec1bdfd6cd5e4e617cf7191f0c326131a)[/img]
This pic is looking under the intake manifold. On the very top left of the pic you can see the now metal pipe coming in from above. Circled, is the end of said pipe, it has a flange on the end of it, held in place by 2 torx screws. One you can see, the others rough position is marked with the X. If I undo this, is this where the regulator is housed?
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2F%5BURL%3Dhttp%3A%2F%2Fs46.photobucket.com%2Fuser%2FMeallbhan%2Fmedia%2F2013-12-09184558.png.html%5D%5BIMG%5Dhttp%3A%2F%2Fi46.photobucket.com%2Falbums%2Ff135%2FMeallbhan%2F2013-12-09184558.png&hash=e584d49fe1429a3cd60c29c8bbf71b39229202ac)[/img]
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Hmmm, I need lessons!
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Post the URL to the image in the thread, it will sort it out for you
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(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2F%5BURL%3Dhttp%3A%2F%2Fs46.photobucket.com%2Fuser%2FMeallbhan%2Fmedia%2F2013-12-09184412.png.html%5D%5BIMG%5Dhttp%3A%2F%2Fi46.photobucket.com%2Falbums%2Ff135%2FMeallbhan%2F2013-12-09184412.png&hash=bbd4c78ec1bdfd6cd5e4e617cf7191f0c326131a)[/URL][/img]
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2F%5BURL%3Dhttp%3A%2F%2Fs46.photobucket.com%2Fuser%2FMeallbhan%2Fmedia%2F2013-12-09184558.png.html%5D%5BIMG%5Dhttp%3A%2F%2Fi46.photobucket.com%2Falbums%2Ff135%2FMeallbhan%2F2013-12-09184558.png&hash=e584d49fe1429a3cd60c29c8bbf71b39229202ac)[/URL][/img]
???
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If your using photobucket it's the bottom link the IMG one
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Thats the one I used and put it between the img tabs
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Heres one of the pipe infront of the radiator, where I've circled is the end that goes under the intake manifold.
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fi46.photobucket.com%2Falbums%2Ff135%2FMeallbhan%2F2013-12-09184412.png&hash=58b44a40776626cc3075d50dc31efc7646a32b07)
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This pic is looking under the intake manifold. On the very top left of the pic you can see the now metal pipe coming in from above. Circled, is the end of said pipe, it has a flange on the end of it, held in place by 2 torx screws. One you can see, the others rough position is marked with the X. If I undo this, is this where the regulator is housed?
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fi46.photobucket.com%2Falbums%2Ff135%2FMeallbhan%2F2013-12-09184558.png&hash=b39200cde6f0201d6fa5eff80b832aa3ac668b49)
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Success! :jumpmove:
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That hose you're looking at goes to the main thermostat housing mounted on the block I think.
I think I can see the bypass thermostat in the second picture you have posted. I think you can see the metal clip that holds it together in the top left of the picture.
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The shiney stainless looking clip?
Ah, right. We're getting warmer. I'll have another look tomorrow, lol.
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(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fa171%2Fwlegge%2F91F45FFA-8304-46ED-AEC3-E7873FAA8693.jpg&hash=928e7d0384a62b3dbbe02b6762dd3c98c3ecdfc3)
You can see the clip on this photo
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fa171%2Fwlegge%2F657596AA-3C1E-4C7A-99EA-0B44404E259A.jpg&hash=bfe2c2a6a11b53545da236d1586f7c3735b50bb3)
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Ok, think I found it. The silver bit on the left is the bottom of the rubber pipe that is in front of the radiator.
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fi46.photobucket.com%2Falbums%2Ff135%2FMeallbhan%2F2013-12-10183813.png&hash=62b996d255506532158675dc7e7d99e85ee6d0d0)
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Yep - that's the one :jumpmove:
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Sound. I'll go and see VW tomorrow for a new part. Can it be changed without loosing all the coolant and just top it up after? Or is a drain required?
I'm still wondering what this bit is though? The part in the very first pic I posted. I've enlarged it a bit so it's easier to see. Its the black plastic bit under the a/c metal pipe. It looks the same as the black plastic housing that holds the regulator in the pic above. It's making me think there may be another regulator there too. It's right down the side of the inner arch beneath the alternator pulley.
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fi46.photobucket.com%2Falbums%2Ff135%2FMeallbhan%2F2013-12-08173835.jpg&hash=08026cad5359a4dab7a0496026351871db0482dc)
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Not sure, I'll have to take a look at mine tomorrow in the light.
It's a full drain job to change the one we've identified correctly - sorry.
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Ah well, I suppose the trade off is that the regulator looks fairly easy to get to.
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Am quite sure that's part of air con because of the black plastic valve above it on the pipe. Very similar to air con re charge points.
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No it NOT the silver pipe with the black bit on top, its UNDER this. The fat black plastic one. This comes from the top left corner of the radiator, after the fat black plastic bit it changes to a flexible black rubber water hose.