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Coolant Overflow after driving 

 

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 Post subject: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 2:39 am 
Getting Side Ways
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Hi Guys, yesterday after i drove to work, i had the aircon on max, its about a 20 minute drive down the freeway from home i got to work and turned the car off and it dumped coolant out of the overflow pipe on the header tank, it was about 32 degrees when i was driving, any idea what wouldve caused this? ive just had my headgasket and water pump replaced? theres still plenty of coolant in the header tank

thanks,
Brent

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 5:46 am 
Smokin em up
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blockage in radiator? I'm not entirely sure but if anything running your heater full bore should've dropped the pressure put on your cooling system :/ Was the air actually warm? Just confirming operation of your thermo stat. When you say still plenty of coolant is it meeting the max mark? Perhaps you just had too much to begin with?

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 7:50 am 
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Try a new Rad Cap, these are often overlooked.

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 8:03 am 
Smokin em up
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True that i got a mechanic to pressure test my cooling sytem for leaks, water was dissapearing somewhere only way he could narrow it down would be the radiator cap, +1 dc_todd

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 8:31 am 
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radiator cap is my recommendation too... If it comes out the overflow pipe it is because the cap is letting past...

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 8:36 am 
Getting Side Ways
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Mine does the same thing on hot days . It's just the radiator cap

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 9:36 am 
Parts Gopher
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my mates EF done the same thing on a 36 degree day. found out it wasn't far off the max mark since he filled it. i only ever do mine just over half.

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 9:52 am 
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If you fill it over max it pumps the excess out... Always run it at max because that gives you headroom then...

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 11:17 am 
Parts Gopher
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just keeping it 3/4 full should be fine though? the cooling system has always been great on my car. even on gas in 40 degree heat with the air con blasting.

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 11:21 am 
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wont cause any issue... But if you have a head gasket blow out you'd have more water to spare is what I was getting at... But you said just over half initially, wouldn't be much water difference between 3/4 and full... Same as your brake fluid... You don't run it at half just because you can... You run it at full as it contains enough to allow for pad wear...

Cheers,
Tim

 

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Performance: Complete AUII VCT Wiring & Power Train, Pacey Headers, 2.5" Exhaust, Exedy Clutch, DBA Rotors
Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
Tunes: 8" Pioneer Sub, JBL Speakers, Clarion Double DIN Headunit

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 12:04 pm 
Parts Gopher
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my bad :oops: true. last headgasket blowout i had was just on an old eb series 1. 2 days to strip it down and replace for the first go. it's been a long time since i've had to touch my fairmont under the bonnet..

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 12:28 pm 
Getting Side Ways
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This happened to me once. Turns out you need to do the cap up ALL the way. :oops: Lost 3 litres when I stopped the engine.

New rad and new cap and it's all good now.

Thanks,

Evan.

 

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 12:41 pm 
Getting Side Ways
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thanks guys ill change the cap, could this also be a reason as to the car runs alot hotter in warmer temperature than it does at night? i mean at night it stays below L and at max goes to A, yet on warmer days it gets to M or R and stays there? this on an ef for the letter reference on the temp gauge

 

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95 Ef Gli, mods : Tickford Head, Tickford ecu, Pacemaker 4499, Venom 100 cpi cat, Redback 2.5" catback, Wade 977b cam, ba xr6 intake and SS inductions, k & n filter & leather seats. 147.5kw @ wheels

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 12:48 pm 
Technical Contributor
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It shouldn't vary like that... No matter what the weather it should be the same temperature... Either your thermostat is playing up and getting stuck or your radiator can't cool enough on hot days... Possibly blocked... Sounds like the cooling system is due for a service...

 

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93 Red ED 5spd Manual Build Thread

Performance: Complete AUII VCT Wiring & Power Train, Pacey Headers, 2.5" Exhaust, Exedy Clutch, DBA Rotors
Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
Tunes: 8" Pioneer Sub, JBL Speakers, Clarion Double DIN Headunit

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 Post subject: Re: Coolant Overflow after driving
Posted: Thu Jan 19, 2012 12:54 pm 
Getting Side Ways
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TimmyA wrote:
It shouldn't vary like that... No matter what the weather it should be the same temperature... Either your thermostat is playing up and getting stuck or your radiator can't cool enough on hot days... Possibly blocked... Sounds like the cooling system is due for a service...


i thought as much, must be the radiator blocked, ive had a different head and all gaskets changed just before xmas, still piss me off considering the radiator isnt even 12 months old

 

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95 Ef Gli, mods : Tickford Head, Tickford ecu, Pacemaker 4499, Venom 100 cpi cat, Redback 2.5" catback, Wade 977b cam, ba xr6 intake and SS inductions, k & n filter & leather seats. 147.5kw @ wheels

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