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Author Topic: alhambra tdi coolant system pressurising  (Read 4057 times)

Offline yorkie513

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  • Posts: 3
  • Thanked: 0
  • Model: Alhambra Mk2
  • Spec: 03 tdi 115 se
  • First Name: john
  • Region: Yorkshire
alhambra tdi coolant system pressurising
« on: April 10, 2016, 09:36:19 PM »
Hi everyone,, I have read a few posts in the library area, so I thought I would try here.
 I have a 1.9 tdi se Alhambra mk2, I have recently noticed a few problems with the heating side, firstly I noticed the aux heater pipes that come up under the rear n/s wheel arch were leaking, so I replaced them, I then decided to flush the whole coolant system out , I then replaced the coolant etc, and ran the car with the lid off the expansion bottle to refill the system, I noticed the coolant coming back into the bottle through the small return pipe,, it seemed a little intermittent to me,, anyway I watched the needle on temp gauge til it reached normal temp then made sure water was warm in bottle(finger test!)  I replaced the cap and went for a drive,,, things seemed ok I had nice hot air coming out of heater vents,so I stopped and checked pipes from under rear wheel arch,they were nice and hot too,, so I carried on with my drive,, then the air went cold and my temp needle began to rise towards very hot,, so I stopped and released some pressure from the bottle,, water everywhere!!  I waited for it to cool enough to refill then drove the 8 miles home,, I then let it cool down completely,i noticed the water was well below the minimum mark and unscrewed the lid off the bottle again to be greeted with a gush of air/water which came from the engine and refilled the bottle, I fitted a new thermostat in January 2016 so I know its not that but I have noticed that  the heater pipe that comes from the thermostat is usually cold,,whereas the heater pipes from top of radiator and header tank/bottle and auxillary pipes are all hot,,, can anyone shed any light coz its driving me nuts and ive just spent a fortune putting it back on the road after leaving it parked up for a year,, the car has done 251,000 miles but I replaced the engine which has only done 104,000 miles,, help would be much appreciated ,,thanks :'(

Offline johnnyroper

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  • Posts: 2943
  • Thanked: 147
  • Model: Galaxy Mk2
  • Spec: 02 tdi 115 ghia
  • Region: South West
  • Country: United Kingdom
Re: alhambra tdi coolant system pressurising
« Reply #1 on: April 10, 2016, 10:23:20 PM »
The hose off thermostat is usually cold unless you have been under load or driving long distance in hot weather,that's just how the pd engine is.

From what you describe I would say either air locked cooling system or the head gasket is pressurising it.

I take it all was ok apart from the leak until you drained and filled cooling system? If so just persevere with the topping up going for a drive and leave it to cool down. Ideally want to get it hot slowly release pressure and leave with cap off overnight and try again the next day.

Offline insanitybeard

  • Greetings from Mr Chick!
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  • Posts: 2427
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  • Model: Galaxy Mk2
  • Spec: '54 130ps TDI Ghia
  • First Name: Paul
  • Region: South West
  • Country: United Kingdom
Re: alhambra tdi coolant system pressurising
« Reply #2 on: April 10, 2016, 10:31:34 PM »
Did you have any heating/ overheating issues before replacing the coolant? After replacement, you'll always have some trapped air in the system which will not purge until the engine gets up to normal operating temperature and the thermostat opens, after which the level will drop considerably (sometimes even enough to completely empty the header tank) in the header tank- for this reason when I've changed the coolant in mine I've gone for a gentle drive stopping at regular intervals to check the coolant level and release (very carefully to avoid boiling over!) the header tank cap to relieve any pressure, topping up as necessary. Usually the air will purge in one or two big stages as the engine gets up to temperature, and once that's happened and you've left it to cool overnight and topped up the following morning it's fine and the level doesn't alter after that- unless you have a leak.
Always learning..... Often by mistakes!

Offline yorkie513

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  • Posts: 3
  • Thanked: 0
  • Model: Alhambra Mk2
  • Spec: 03 tdi 115 se
  • First Name: john
  • Region: Yorkshire
Re: alhambra tdi coolant system pressurising
« Reply #3 on: April 10, 2016, 10:44:27 PM »
thanks for prompt replies ill try this method,, I don't believe I had problems before I changed thermostat,, im going to change timing belt shortly so ill replace water pump (obviously) with a metal impeller one then will replace coolant,, and keep fingers crossed.. by the way is there any test you can do to test head gasket?  thanks john

Offline johnnyroper

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  • Posts: 2943
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  • Model: Galaxy Mk2
  • Spec: 02 tdi 115 ghia
  • Region: South West
  • Country: United Kingdom
Re: alhambra tdi coolant system pressurising
« Reply #4 on: April 10, 2016, 10:53:14 PM »
You can do a sniffer test on expansion bottle but I exhausted all other options like blockages,water pump etc and just went with my instincts that it was head gasket rather than sniff test. If everything else is fine then not much else it can be.
Does yours have plastic impeller type of pump then?

Offline yorkie513

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  • Posts: 3
  • Thanked: 0
  • Model: Alhambra Mk2
  • Spec: 03 tdi 115 se
  • First Name: john
  • Region: Yorkshire
Re: alhambra tdi coolant system pressurising
« Reply #5 on: April 28, 2016, 06:48:38 PM »
I did sniffer test and its not head gasket I have steel impeller on water pump,, I have just bought a sharan with same engine(auy) so am gonna change engine,, after fitting new water pump and timing belt kit,, I noticed  a coolant smell in cabin so assume it could be a leak from matrix so gonna replace that too,, its a ball ache job coz have just removed one from the sharan but hopefully should remedy the whole problem,, then ill recon the engine I take out so I have a spare,,,  8-)

Offline johnnyroper

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  • Posts: 2943
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  • Model: Galaxy Mk2
  • Spec: 02 tdi 115 ghia
  • Region: South West
  • Country: United Kingdom
Re: alhambra tdi coolant system pressurising
« Reply #6 on: April 28, 2016, 07:02:57 PM »
Sniffer test can be inconclusive on a diesel but good plan swapping if you have a spare.
I feel your pain doing matrix mine was leaking so dash out job,only good thing with mine was having cylinder head off made access to dash bolts easier. Same with you if you do with engine out.

Offline SiC

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  • Posts: 29
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  • Model: Galaxy Mk3
  • Spec: 2008 TDI 125 Zetec
  • Region: North West
Re: alhambra tdi coolant system pressurising
« Reply #7 on: May 04, 2016, 12:43:35 AM »
My alhambra (same engine) had a sniffer test that came back negative for HG failure. I asked them to try it again whilst holding the revs higher - it came back positive for HG failure.

Just thought I'd mention it, as Johnny roper says, they can be hit or miss on diesels.

Sent from my GT-I9505 using Tapatalk


 

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