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displaying posts 1 to 8 of 8
| Author | Subject: Pressure when cold |
 djb
Newbie  Location: Brisbane Registered: 07 Mar 2015 Posts: 22 Status: Offline |
Post #1
Would a leaking heater matrix and water pump account for a tiny amount of pressure in the cooling system when cold?It is a barely audible hiss when I open the radiator cap. Please tell me it can't be a head gasket  There are no other signs of a head gasket failure that I can see. |
 Posted 22nd Nov 2015 at 02:42
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,839 Status: Offline |
Post #2
most likely to be hg, leaks elsewhere would cause loss of pressure.________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 22nd Nov 2015 at 08:21
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djb
Newbie Location: Brisbane Registered: 07 Mar 2015 Posts: 22 Status: Offline |
Post #3
So a head gasket is the only possibility, nothing else? |
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Posted 22nd Nov 2015 at 09:08
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bigbadbowen
Seasoned Pro  Location: Winchester Registered: 21 Nov 2003 Posts: 13,753 Status: Offline |
Post #4
Yup |
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Posted 22nd Nov 2015 at 09:39
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armzsc6
Seasoned Pro  Location: Crowborough Registered: 22 Mar 2008 Posts: 3,445 Status: Offline |
Post #5
If there is residual pressure in the coolant system when fully cooled say next morning then yes HG beginning to fail. Some engines run like it for some time but it will only get worse over time.________________________________________ Black power baby! SUUUUUPERCHARGED Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p 12x 306's owned so far Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist. Pug planet / Citroen Lexia diagnostics / code reads available. |
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Posted 22nd Nov 2015 at 21:03
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tvrfan007
Seasoned Pro  Location: In the garage Registered: 29 May 2005 Posts: 3,488 Status: Offline |
Post #6
My HG went, left residual pressure in the cooling system even after 48 hours. When you ran it with the rad cap off it would merrily bubble away the whole time the car was running.________________________________________ I'm Si btw Night Blue VW Golf GTD Bianca LBSC Rallye - Track/Road Slag Project Thread Sparkling Silver Mini Cooper D - Super Dooper - (The other half's wheels) |
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Posted 22nd Nov 2015 at 21:09
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #7
As said, there should be no pressure in there at all when fully cooled.________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 23rd Nov 2015 at 23:56
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djb
Newbie Location: Brisbane Registered: 07 Mar 2015 Posts: 22 Status: Offline |
Post #8
I'll do a compression test tomorrow and see what that says. |
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Posted 24th Nov 2015 at 08:31
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