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Author Topic: Losing coolant, at a loss ... 3.0 Facelift  (Read 707 times)

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matt

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Losing coolant, at a loss ... 3.0 Facelift
« on: 02 February 2009, 14:58:06 »
How are you supposed to positively identify oil cooler leakage?

Not sure I follow the logic of the HG/oil cooler flowchart (years in IT would possibly explain that)   ;D

Anyway I don't much want to buy any parts that aren't definitely needed as the company I worked for folded just before Xmas.

Symptoms (including incidental)

Losing coolant ... about a pint every 100 miles.
Can't identify anywhere it may be going to.
Mayo in filler cap - quite a bit, but
Dipstick is normal dark oil
Cant smell exhaust fumes in the header tank
No evidence of leakage around HBV (that I can tell anyway - can only go on touch)
Cabin heater is extremely feeble - it gets there, but very slowly.  Can't find any evidence of internal water loss
Rocker cover gaskets and breathers definitely need doing.

Err, so what next?  Anything else to check?
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Elite Pete

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Re: Losing coolant, at a loss ... 3.0 Facelift
« Reply #1 on: 02 February 2009, 15:04:32 »
Have a look under the car for traces of water on the gearbox bell housing, there's 2 bolts at its lowest point
« Last Edit: 02 February 2009, 15:05:13 by Elite_Pete »
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Marks DTM Calib

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Re: Losing coolant, at a loss ... 3.0 Facelift
« Reply #2 on: 02 February 2009, 15:06:33 »
In the maintenance section is a guide on how to convert a coolant cap into a system pressure test tool.

Doing this will allow you to pressurise the coolant system and look for leaks.

The favourite is the bypass valve, this either leaks slowly or lets go big time.

I recently had to change the one on my facelift.....the wife phone to tell me the satnav had spat the disc out......she didn't mention the check coolant warning!
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TheBoy

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Re: Losing coolant, at a loss ... 3.0 Facelift
« Reply #3 on: 02 February 2009, 15:28:55 »
Quote
In the maintenance section is a guide on how to convert a coolant cap into a system pressure test tool.

Doing this will allow you to pressurise the coolant system and look for leaks.

The favourite is the bypass valve, this either leaks slowly or lets go big time.

I recently had to change the one on my facelift.....the wife phone to tell me the satnav had spat the disc out......she didn't mention the check coolant warning!
Permission granted to terminate her  :-X
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Seth

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Re: Losing coolant, at a loss ... 3.0 Facelift
« Reply #4 on: 03 February 2009, 21:28:05 »
Am guessing a pressure test will show the HBV to be the culprit.
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cem_devecioglu

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Re: Losing coolant, at a loss ... 3.0 Facelift
« Reply #5 on: 03 February 2009, 21:43:56 »
after driving the car for sometime (say 15-20 min) listen to the voice

coming from the coolant tank.. under pressure (engine hot)  old tank

caps leak vapour or more.. :-/

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