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Post by keithbatkins on May 27, 2013 19:06:58 GMT 2
Good evening guys from a cold Johannesburg. Ever since I have owned CERATOTH I have had a minor but still somewhat irritating problem with air getting into the cooling system. Easily fixed, in so far as every 6 months or so; or when the temperature gauge starts to climb up a bit, I use the 'coke bottle', run the engine to temperature and bleed the air out of the system via the radiator cap hole. Replace the radiator cap and all is then ok....until the next time. There are no leaks (as far as I can see), water (and antifreeze) are all at correct levels, all clamps are tight, hoses were all replaced after CERATOTH's 'bath',as was the radiator cap, which I have always had replaced on CERATOTH's annual service. Any thoughts as to what is causing this problem ? Regards to all at LOCSA, Keith and CERATOTH
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spikes
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Post by spikes on May 27, 2013 19:20:33 GMT 2
A minute crack in plastic that lets air in when cold, would be my guess. Very difficult to find as it closes up when warm. Check for tiny traces of antifreeze before you start the NIVA. Really small
Other than that improper sealing in the rad neck due to roughness in the metal neck.
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spikes
Moderator
Posts: 3,689
Location: Mpumalanga
Town: Nelspruit
Registered: Apr 19, 2010 19:39:51 GMT 2
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Post by spikes on May 27, 2013 19:23:18 GMT 2
Keith, try and borrow a rad pressurizing cap and pressurize when cold, leave overnight and you might just see the leak
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Post by ronnie on May 27, 2013 20:36:09 GMT 2
A minute crack in plastic that lets air in when cold, would be my guess. Very difficult to find as it closes up when warm. Check for tiny traces of antifreeze before you start the NIVA. Really small Other than that improper sealing in the rad neck due to roughness in the metal neck. Hi Spikes and Keith I agree with Spikes, somewhere when the motor is cooling down air is leaking in, in a very small amount and over time there is enough present to cause your problem. You could try tightening all clips and any joints on any thing involved with the cooling system. Don't forget the likes of the bolted connection to the side of the heater. It is always possible for air to leak in, but no water leaking out so you may not see any sign of antifreeze. Ronnie
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Post by ronnie on May 27, 2013 20:54:12 GMT 2
Hi Keith If there is no leak and there is air in the system you would expect the level of water in the reservoir to increase. If water is leaking out somewhere you would expect to see the level of water in the reservoir decreasing ?? Ronnie
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Post by keithbatkins on May 28, 2013 14:32:18 GMT 2
Thanks Guys. I have marked the reservoir so I should be able to see if the level goes up or down. I have a feeling that it will be going up, ie air getting in with no loss of coolant, but only time will tell. As I said in my original post it is not a 'biggie' just an irritant. If that is all that goes awry with CERATOTH, I'm not doing too badly ! Regards to all at LOCSA, Keith and CERATOTH.
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Post by keithbatkins on Jun 19, 2013 22:20:49 GMT 2
Checked the water level in the expansion bottle today and it has gone up about 1cm so it would seem that air is getting into the system from somewhere. When things get a little warmer here in Johannesburg I will make a proper effort to try and find out just from where the air is getting in. At the moment though I'm just glad that the heater is working :-) Regards to all at LOCSA, Keith and CERATOTH
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Post by ronnie on Jun 20, 2013 22:05:16 GMT 2
Hi Keith
Just a thought, could it be the seal on the water pump allowing air in when cooling down ? Don`t know how you could check this unless you had a spare pump you could try.
Ronnie
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