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Re: hose failure/s on a VAG motor. longish.
At 22:09 99-09-04 +0100, email@example.com wrote:
>Anyway, over the past 4k miles I've had the car there's always
>been oil/mayo on the inside of the expander tank and on top of the
>coolant which I assume is from when the cooler went. Last week, I
>flushed out the water system with a standard radiator flush and got
>most of the sludge out of the expander tank - by taking it off and
>giving it a soak. Anyway within days I noticed that the sludge
>reappeared in the expander tank and there's another layer of sludge
>on top of the water. Here are my questions:
>Do u think I have a more serious problem - head gasket? My theory
>is that I don't since water circulates the system, carrying the
>mayo/sludge left behind when the cooler failed to the expander
>tank which is less dense, hence sitting on top and accumalating,
>and the flush didn't get rid of all the mayo? but what do u think? Do
>u know any other symtoms which reflect a head gasket? - no white
>smoke or water in the oil.
No white smoke doesn't actually rule out a blown head gasket. Blown head
gasket can give variety of symptoms: oil out, water out, oil in water,
water into cylinder, exhaust gases into water etc. depending on where the
crack is. Oil in water is a classic symptom of a blown head gasket,
however, since the oil cooler (and I assume it's an oil-to-water cooler)
has failed before, the remaining sludge may be difficult to get rid of.
>I wrote to this group a while ago about high oil temp on the car.
>Anyway, I replaced the temp sender and now get readings of
>around 95- 105 Degs.C.
Sounds perfectly normal - the oil temperature should always stay around (or
slightly above) 100C as this enables water to evaporate.
>My water temp usually stays between 1/4
>and 1/2 when the fan kicks in, 1/4 in the cold weather or cruising,
>but between the 2 in hot weather or when driving hard.
>I also 'feel' that the engines hotter than it should be and the coolant
>is always under pressure - and comes shooting out when u undo
The 1/4 to 1/2 of the scale seems normal (if not a little on the low side),
as to the pressure, it is a pressurized system and it's supposed to act
>So do u think I have a more serious problem or will replacing all the
>hoses solve it - and is this standard practice for a car this old?
Yep, you've got a 9 years old car out there and at this age most coolant
hoses are at the end of their lifespan.
>Any advise on the hoses I should use? VAG seems v. expensive. -
>They quote ~ £14 in their "low price catalogue" for the top hose
>which has just gone, and I was quoted £17 for a tiny 3 inch
>standard hose! (which I replaced for about £4 and have about 1.5
Most hoses can be cheaply purchased from independent automotive stores
unless it's a very weird one (like the T-shaped one).