Over heating

[togga]

I've had a similar problem with my 1.7 d engine & have had it confirmed this morning that the head gasket needs replacing

[Mocki]

its sounding like it needs bleeding properly before you can be sure whats happening.#
if it still does the same when bled properly, or you cant bleed it, it may well be a cracked head. It Isnt a water jacket seal at fault, by the fact it is pressurising.

are you getting coolant in the bores? (wet spark plugs?) oil in the water? could be the lower seals.

[xpress]

for a last ditch try you could always try some head gasket sealing additive like k-seal, or barrs leaks, i hear they put it in GM engines from the factory as they are bedding in to help seal everything up around the cooling system and gaskets.

[Ian Hulley]

for a last ditch try you could always try some head gasket sealing additive like k-seal, or barrs leaks, i hear they put it in GM engines from the factory as they are bedding in to help seal everything up around the cooling system and gaskets.

Pity GM didn't try it a couple of weeks ago. Sadly it speaks more about GM than the products.

Ian

[xpress]

this could be true. i think this stuff can have its place if you are trying to stave off a complete rebuild, or an old knackered car to get some more mileage out of it. the wynn's stuff in a can that you put in the rad for the cooling system is supposed to flush out without any residues, so could be a good between service intervals measure between flushes.

[Ian Hulley]

this could be true. i think this stuff can have its place if you are trying to stave off a complete rebuild, or an old knackered car to get some more mileage out of it. the wynn's stuff in a can that you put in the rad for the cooling system is supposed to flush out without any residues, so could be a good between service intervals measure between flushes.

Depends how much you like walking home I guess when these babies are set to go you ignore the tell-tale signs at your peril.

Ian

[toomanytoys]

Can you oplease fill out your profile with a location as we can then poss suggest a member or workshop that can give assistance...

But... seeming as the engine is a recon and he put it in???? I'd be going back to him to see what he says... could be a cracked head or failed head seal... and 150 miles "without problem" doesnt say much... but bleeding it properly is required... if lots of air is going back in when running then its deffo a head/seal thing.. if temp gauge is never going above half way... to "boil" the coolant you need to get it above 100 degrees... and the temp gauge would show this... pressurisation from a cracked head or failed seal looks like boiling as it blows the coolant out of the system....

One thing... the blue pressure cap... is it a gen VW one or a cheapo gsf one??? the cheapo ones do have a reputation of not working... this will allow the cooant to be pushed out of the system..

I nursed my velle back 450 miles one eve bled it down once on the trip... as long as I didnt give it any stick and ran at 55-60 it was fine.. but its got a cracked head.

[Urchins]

Think it's just Header tank cap. Have replaced for new, and tested. Coolant holding in header tank much much better, fan kicking in as well. fingers crossed.

[Urchins]

Finally got to the bottom of this, for the time being anyway. Wasn't HG, corrosion of the long pipe between the Water pump and housing for thermostat had allowed pins to form in pipe and a crack at the join. water was seeping out and losing coolant and alowing airlocks to form in the system which ultimately kept causing the caps on headtank to fail and eventually boiling in overflow tank.
this is a regular problem with the system. new pipe 60 quid job done.

[happy camper]

i'd put a new header tank cap ( darlek ) on it its also worth wiring your fan to an on / off switch on the dash to give you control of it this mod cost about a tenner to do and takes about an hour

[OriginalSeries2]

i'd put a new header tank cap ( darlek ) on it its also worth wiring your fan to an on / off switch on the dash to give you control of it this mod cost about a tenner to do and takes about an hour

I like the sound of that - do you have a wiring diag Happy Camper?
I have a 1.9DG that seems to overheat in traffic jams (gauge goes up and light flashes) but drops back down as soon as start moving. I have never heard the fan kick in. I don't lose any coolant though.

[Mocki]

i'd put a new header tank cap ( darlek ) on it its also worth wiring your fan to an on / off switch on the dash to give you control of it this mod cost about a tenner to do and takes about an hour

I like the sound of that - do you have a wiring diag Happy Camper?
I have a 1.9DG that seems to overheat in traffic jams (gauge goes up and light flashes) but drops back down as soon as start moving. I have never heard the fan kick in. I don't lose any coolant though.

why not just buy a new rad fan sender in the first place?

a switch on the dash is a bodge

[docklad]

Well well well, all the symtoms above have just happened to my T25 19 D(recon passat 98). Diffence being I've just replaced the HG. I feel like screaming. It's as if she can't keep any water in. Every single loose clamp has let a bit out after I've tightened another. The main pipe from the top of the coolant tank shot off yesterday. I fill her up( i think) and then try again. She goes for a bit and then i feel the heat rising in the cab and just know she's too hot. All the hoses are too hot to touch and feel really full and tight.

I followed the rules for changing the HG and an experienced mechanic( friend) replaced the timing belt with my assistance( making the brews). But she's not right. I've only had her for 6 weeks. I failed to fill with coolant before a trip and boy did she smoke. Pipes burst, oil spat out and trailed for two miles, but i had to get where i was going and she made it under duress. Standing still for a week she made it back home with what seemed to be no probs. I did replace the thermo on the block and a couple of hoses.

Day later noticed by chance that the bottom pipe for the coolant tank was swelling to five times it's size. this was reducing as I undid the daleck cap. friend came, took one loook and said HG. So done that and seems worse but still runs. New daleck cap off e-bay, old one broke nipple but managed to use heat proof tubee strawee type of pipe in nipple hole and gaffered it to get home. Did the job. So many things going through my head. All I want her to do is run like all the others.


oh hello

[Nicola&Tony]

New daleck cap off e-bay . . .

Is it a genuine vw one with the vag logo on it? If not, as others have said above, the cheaper ones are often cr*p. Go to Brickwerks for reliable stuff:
dalek cap £10

Tony

[docklad]

friend just been....head off again.