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coolant loss |
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T5 TDI 
Vanorak 
Joined: 05 Nov 05 Location: Cornwall Status: Offline Points: 2169 |
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 Topic: coolant lossPosted: 17 Aug 10 at 18:14 |
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Normally any escaping compression will cause overheating by interfering with the normal direction of flow of the coolant even if it doesn't chuck the coolant out so that really is an odd one...
One silly thing you might as well check is the coolant bottle cap. If it's working properly it should come to a light stop as you tighten it and then turn about 1/8 further with an audible click. Unless it turns that last bit the system is no longer sealed. I have seen your sort of problem be caused by that. I know it sounds unlikely but it's worth a quick look.
One last thing you could check is to start the engine with the cap off. If the second the engine cranks the coolant leaps up violently in the bottle and continues to do so it almost certainly is escaping compression.
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2004 174 Panel Van Engine code AXE |
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holder
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Joined: 15 Jul 10 Status: Offline Points: 5 |
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Posted: 17 Aug 10 at 17:12 |
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cooling fan is running ok & have had a new stat fitted.
the cooling system is operating at the correct temperature
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T5 TDI
Vanorak
Joined: 05 Nov 05 Location: Cornwall Status: Offline Points: 2169 |
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Posted: 17 Aug 10 at 11:16 |
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Have you had the thermostat changed? There have been a few early opening 'stats reported causing luke warm heaters. Yours would have to be the other way round of course opening late or jammed shut. Defineately not the ECU unless it's cooling fan related.
Edited by T5 TDI - 17 Aug 10 at 11:17 |
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2004 174 Panel Van Engine code AXE |
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energysolutions
Vanorak
Joined: 02 Dec 08 Location: Earth (For Now) Status: Offline Points: 2878 |
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Posted: 17 Aug 10 at 09:04 |
I dont believe andysam was citing a cracked manifold as the cause (they arent water cooled) but rather pointing out that whoever had mentioned that cracked heads/blocks are common (which arent) may have got mixed up with the manifold (which are)
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!!Never Eat Yellow Snow!!
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holder
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Joined: 15 Jul 10 Status: Offline Points: 5 |
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Posted: 17 Aug 10 at 08:44 |
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i mentioned cracked manifolds to the garage but they said the manifolds are not water cooled or fed so i ruled out this problem
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andysam
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Joined: 15 Nov 08 Location: Sussex Status: Offline Points: 212 |
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Posted: 16 Aug 10 at 20:50 |
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As far as I know it's not a switched system other than the thermostat. VW consider them sealed "for life" and the VW service centre was VERY surprised when I asked for a coolant change. I'd be very surprised if it has rusted at that age as long as the correct longlife (red) antifreeze is used.
It's not cracked heads it's cracked manifolds that aren't unheard of.
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holder
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Joined: 15 Jul 10 Status: Offline Points: 5 |
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Posted: 16 Aug 10 at 20:34 |
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the oil level is ok and the vehicle runs perfectly without over heating. the cooling fans operate correctly.
the cooling system is getting huge pressure in the hoses and pushing the coolant out of the overflow in the expansion tank. i have to put water in it every day as the low level light comes on.
i have bypassed the EGR valve by removing the coolant hoses and linking them with a piece of copper tube however this has made no difference.
i know this may be wishfull thinking but could it be ECU related, (maybe a switch at fault, or something not allowing the coolant to flow fully.
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andysam
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Joined: 15 Nov 08 Location: Sussex Status: Offline Points: 212 |
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Posted: 01 Aug 10 at 09:46 |
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Can you clarify that you have checked your oil level is okay?
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T5 TDI
Vanorak
Joined: 05 Nov 05 Location: Cornwall Status: Offline Points: 2169 |
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Posted: 31 Jul 10 at 21:18 |
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You have a manual with a water cooled EGR? That's news to me. We have had almost no reports of head or block problems with the 5 cyl engines here as ES says, and we soon hear about most faults pretty quickly. What about other signs? Does it get hot on the gauge? Do you hear the cooling fans cut in?
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2004 174 Panel Van Engine code AXE |
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energysolutions
Vanorak
Joined: 02 Dec 08 Location: Earth (For Now) Status: Offline Points: 2878 |
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Posted: 31 Jul 10 at 10:56 |
I`ve never heard anything about that, on the contrary in fact, I dont remember ever hearing of a T5 with a dodgy block/head or head gasket issue
Undoubtedly it is possible but it is very rare, it certainly isnt common (not like Vitos - gaskets and injectors are s***e - I speak from experience)
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!!Never Eat Yellow Snow!!
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holder
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Posted: 31 Jul 10 at 08:19 |
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No its a manual. its not loosing coolant through the exaust now, just pushing it back out of the header tank overflow.
i have bypassed the EGR valve by disconnecting the coolant hoses and connecting a copper pipe between them so i dont think it is this.
a mechanic friend says theses engines suffer from cracked blocks but i cant find any info relating to this.
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T5 TDI
Vanorak
Joined: 05 Nov 05 Location: Cornwall Status: Offline Points: 2169 |
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Posted: 31 Jul 10 at 07:57 |
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Not an auto is it? Some of the auto transmission versions have a water cooled EGR valve. I reckon that could cause a fair old bit of steam out of the exhaust if it went wrong.... |
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2004 174 Panel Van Engine code AXE |
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Vantasy
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Joined: 18 Jul 10 Location: Devon Status: Offline Points: 14 |
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Posted: 31 Jul 10 at 00:10 |
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Look through my topic ' losing coolant somewhere? ' ...... like you we are still looking, so watch this space.
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holder
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Posted: 20 Jul 10 at 20:49 |
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i have had a 2006 T5 T32 130 windowvan since new, i had the ECU remapped when the van was 3 months old and i have been impressed with the performance.
about 6 months ago (80000 miles done) i started to lose about half a litre of coolant every1-2 hundred miles but didnt know where from so i just kept topping up the level. then one day i noticed some excesive steam from the exhaust and thought oh no headgasket!
i put some k seal into the coolant and the steam stopped but still loosing water then whilst towing the caravan started loosing loads of water. i had to put in about 5ltrs of water every 40 miles or so until i got stuck in traffic, a big cloud of smoke from the exhaust and loss of power.
my local garage replaced theheadgasket and water pump and turbo and the van ran fine for about a week then it started loosing water again so they have just replaced the cylinder head. the problem is still there. coolant pressure is huge causing loss of coolant from the header tank overflow.
i am starting to suspect the worse such as a cracked block. am i missing something here? Is there a common fault on these vehicles i am overlooking. i have trauled through loads of posts but can only find the common problems such as water pumps and oil coolers but i am certain these are not the problems
anybody's help on this matter will be hugely appreciated
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holder wrote: