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 Posted: Wed Nov 05, 2014 7:09 pm |
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Joined: Nov 05, 2014
Posts: 87
Trade Rating: 0
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Hi all, took a bit of a risk on a GT a few weeks back, the risk paid off up till now.
The car will flow coolant out of the expansion tank everevery time the fan kicks in, even with the cap tight, the water will flow for a few seconds then stop, i just repleced the thermostat and thats leveled the temperature to 90 or just under so thats fine. But it still flows water ever time the fan kicks in.
Its been checked for gas in the coolant and its fine, its been checked for pressure in the cooling system and fine.
I can here rumbling bearings on the water pump side, it goes in for a new water pump next week, but is it the pump. the engine runs great, its not keep on idle but i,m sure its the aftermarket pipes, lack of back pressure ithink.
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Posted: Thu Nov 06, 2014 1:10 am |
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Joined: Feb 08, 2010
Posts: 7046
Trade Rating: +5
Location: In the garage
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Maybe the cap is knackered.
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| 2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible. | |
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Posted: Thu Nov 06, 2014 4:29 pm |
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Joined: Nov 05, 2014
Posts: 87
Trade Rating: 0
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I wonder on that one, thing is it will emty the whole expansion tank, today going to park up in my local town because i waa driving slower, time i stoped i could hear the water bubbling just like a kettle, i thought all i need is my tea bags i be well away lol. Speaking to my friend whos a mechanic hes thinking that water pump isn't pumping that well. It goes in monday, i hope it sort the problem
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Posted: Thu Nov 06, 2014 5:49 pm |
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Joined: Feb 07, 2010
Posts: 3666
Trade Rating: +59
Location: Scotland
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For the sake of £7 odds, I'd replace your radiator cap first and see if that cures it.
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| '98 Nile Blue 306 GTi 6
'04 Obsidian Black 206 GTi 138 | |
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Posted: Thu Nov 06, 2014 5:58 pm |
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Joined: Nov 05, 2014
Posts: 87
Trade Rating: 0
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Thanks guys, yes i will try the cap 1st, after i changed the thermostat yesterday the temperature is very stable, before it would drop down to just 70 then go up slightly then down again, now its steady 89, when its sitting in traffic at the lights it climbs slowly until around the 100 also, where the fan kicks in it brings the temperature back down nicely, but as the coolant it hot thats when it comes out the cap, i will try the new cap.,
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Posted: Thu Nov 06, 2014 6:10 pm |
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Joined: Nov 05, 2014
Posts: 87
Trade Rating: 0
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Just took the cap off, there's a larger rubber seal on the outter inner thing, thats ok but there's a hole in the middle and there's a small rubber ring hanging out, it wont go back in grrr.
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Posted: Thu Nov 06, 2014 6:25 pm |
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Joined: Nov 05, 2014
Posts: 87
Trade Rating: 0
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Just managed to push the rubber back in, now its seated, would be so funny if a small thing like a rubber ring the size of a 5p has been causing water to come out. Not sealing.
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Posted: Fri Nov 07, 2014 2:20 am |
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Joined: Feb 08, 2010
Posts: 1301
Trade Rating: +4
Location: rochdale
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expansion tank cap is under £4 from pug directly
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Posted: Fri Nov 07, 2014 4:02 am |
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Joined: Apr 14, 2010
Posts: 713
Trade Rating: +2
Location: Gothenburg, Sweden
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| cat41 wrote: |
| Just managed to push the rubber back in, now its seated, would be so funny if a small thing like a rubber ring the size of a 5p has been causing water to come out. Not sealing. |
If it's not sealed it's not pressurized. Pressure keeps coolant from boiling longer (to higher temperatures).
But if sealed and it gets too hot, something will give (see Mythbusters and hot water heaters  ) Might be that that piece is designed to be a/the weak point in the system and that at some point your car got really hot?
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| Silvermetallic 2004 206 RC | |
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Posted: Fri Nov 07, 2014 8:11 am |
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Joined: Nov 05, 2014
Posts: 87
Trade Rating: 0
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Just seen how to check the cooling system on the net, just started the car up, there's 2 large pipes 1 is where the thermostat is and there's another pipe just below that, now the engine started to warm up, the bottom pipe stayed stone cold and it felt that there's no pressure in it, the pipe where the thermostat is warmed up nicely, after 10 minutes the bottom pipe stayed the same, the radiator warmed up, just been chatting to my friend the mechanic and hes confident the water pump isn't working.
What you think on this guys?
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Posted: Fri Nov 07, 2014 10:00 am |
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Joined: Nov 05, 2014
Posts: 87
Trade Rating: 0
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Well i,m smug as, just looked how to fix cooling problems on net, so i tried to bleed the system, there was loads of air in the system, no more water coming out of the expansion tank and with the fix i did on the cap its runing spot on now, made up a homemade large expansion tank to fit into cars expansion tank, worked a treat.
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Posted: Fri Nov 07, 2014 11:11 am |
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Joined: Jan 29, 2011
Posts: 6526
Trade Rating: +10
Location: Westhoughton, Lancashire
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| cat41 wrote: |
| Well i,m smug as, just looked how to fix cooling problems on net, so i tried to bleed the system, there was loads of air in the system, no more water coming out of the expansion tank and with the fix i did on the cap its runing spot on now, made up a homemade large expansion tank to fit into cars expansion tank, worked a treat. |
So you didn't bleed the system when you changed the thermostat?
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Posted: Fri Nov 07, 2014 12:03 pm |
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Joined: Nov 05, 2014
Posts: 87
Trade Rating: 0
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Thats was doing it long before the thermostat change, i did bleed or try but never saw the heater matrix bleed screw, just been out, its loosing coolant somewhere, the heating in the car goes off after a few miles, just checked coolant in tank ands its nearly gone, its a wonder why its got air in the system due to running low on coolant all the time.
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Posted: Sat Nov 08, 2014 9:47 am |
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Joined: Nov 05, 2014
Posts: 87
Trade Rating: 0
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All that work yesterday paid off, coolant system working spot on with no leaks.
The expansion tank makes it too difficult to see the level of the coolant so i knocked up a simple thing to check the levels and it works realy well.
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Posted: Sat Nov 08, 2014 2:29 pm |
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Joined: Apr 01, 2014
Posts: 668
Trade Rating: 0
Location: Cornwall
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If its boiling water then head gasket ! If its blowing water out expansion tank .head gasket .
Sucks air in thou broken gasket and blows it out the water from expansion tank . My engine's could run with out the cap on and water not be pushed out .
If you over fill expansion tank then water is blown out the exhaust .
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| If it aint broke dont fix it ! | |
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