Dave Posted July 12, 2009 Share Posted July 12, 2009 its my saxo 1.4i driving home last week the water is too hot light came on so on looking in the rad filler cap it is bloked with a light brown runny mud substance i presume its oil/water mixed ,checked my oil cap and dipstick there clear .so got most of it out today by constant flushing but there is still some in the system ,ive brought some halfruads system flush 2pack will this clean it out ,and why has this happened is it the head gasket ????????????? any help is much appreciated Quote Link to comment Share on other sites More sharing options...
movistar Posted July 13, 2009 Share Posted July 13, 2009 and why has this happened is it the head gasket ????????????? Sounds just like that...will need the head coming off and replacement headgasket and a thorough clean of the coolant system...check the head too when its off as it might be warped, if it is it will need a skim. Remember oil in you coolant system can damage the rubber hoses...so fix asap otherwise your in for a load of blown hoses in the future! good luck.... Quote Link to comment Share on other sites More sharing options...
stevie_b Posted July 13, 2009 Share Posted July 13, 2009 movistar is spot on. Yes, head gasket failure ("HGF"). The mayonnaise-like substance is the oil and coolant mixing within the engine and emulsifying together. The head gasket needs replacing. You'd be mad to continue to continue running the car in that condition. It's a fairly big job unless you're well used to poking around inside engines. Quote Link to comment Share on other sites More sharing options...
Dnk Posted July 13, 2009 Share Posted July 13, 2009 (edited) How olds the car, have you ever changed the coolant in it ? Are you running the car to flush the system through, if so pop out the thermostat and put the heater on full hot as some gunge will possibly be in there as well as the radiator. When your happy its blockage (gunge free) re fill with water refit the stat and run the car up to see if its still overheating, if it starts going into the hot on the temp then youve def got futher issues so turn it off, this wont cause any more harm than youve already got. Ive had the mayonase like gunge in rads and on oil filler caps and its not always down to B/H/G so worth a try incase its not and nothing lost if it is Edited July 13, 2009 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Dave Posted July 13, 2009 Author Share Posted July 13, 2009 (edited) put a new rad on about 18 months ago -----thanks DNK flushed out the rad today with a high pressure hose pipe, got most of it out from the engine ,already took out the thermostat and had the engine running while i flushed it through, will do that with the heater i can see some in the heater return pipe then will flush it with this halfords stuff and see how it goes its a p reg saxo only cost me 500 quid btw thanks everyone else for your advice Edited July 13, 2009 by Dave (see edit history) Quote Link to comment Share on other sites More sharing options...
Dave Posted July 13, 2009 Author Share Posted July 13, 2009 and why has this happened is it the head gasket ????????????? Sounds just like that...will need the head coming off and replacement headgasket and a thorough clean of the coolant system...check the head too when its off as it might be warped, if it is it will need a skim. Remember oil in you coolant system can damage the rubber hoses...so fix asap otherwise your in for a load of blown hoses in the future! good luck.... how come the oil and filler cap are clear ??????? Quote Link to comment Share on other sites More sharing options...
Dnk Posted July 14, 2009 Share Posted July 14, 2009 put a new rad on about 18 months ago -----thanks DNK flushed out the rad today with a high pressure hose pipe, got most of it out from the engine ,already took out the thermostat and had the engine running while i flushed it through, will do that with the heater i can see some in the heater return pipe then will flush it with this halfords stuff and see how it goes its a p reg saxo only cost me 500 quid btw thanks everyone else for your advice If you've changed the rad recently then i doubt its a build up of gunge from over the years so looking more likely its the H/G. Good luck with it Dave Quote Link to comment Share on other sites More sharing options...
stevie_b Posted July 14, 2009 Share Posted July 14, 2009 Ive had the mayonase like gunge in rads and on oil filler caps and its not always down to B/H/G so worth a try incase its not and nothing lost if it is I can understand a bit of mayo on the oil filler cap (moisture from the air combining with the oil), but I'm surprised about mayo in the rad: I would have thought any oil in the cooling system is a bad sign. Quote Link to comment Share on other sites More sharing options...
Dnk Posted July 14, 2009 Share Posted July 14, 2009 I can understand a bit of mayo on the oil filler cap (moisture from the air combining with the oil), but I'm surprised about mayo in the rad: I would have thought any oil in the cooling system is a bad sign. Yes i dont disagree but can only go on what ive found in the past, perhaps the oil was from a previous failure ? im not sure but if i'd just dived in and assumed the worst i'd have took the head off and fitted new H/G for nothing. I tend not to dive into it being the obvious these days after that:) Quote Link to comment Share on other sites More sharing options...
stevie_b Posted July 14, 2009 Share Posted July 14, 2009 Ah, fair enough. Always wise not to dismiss other causes. Quote Link to comment Share on other sites More sharing options...
Dnk Posted July 14, 2009 Share Posted July 14, 2009 Ah, fair enough. Always wise not to dismiss other causes. Unless youve owned the car from new you never know all of its history Ive had g/f's who have put oil in the rad so theres another possibilty Quote Link to comment Share on other sites More sharing options...
movistar Posted July 15, 2009 Share Posted July 15, 2009 how come the oil and filler cap are clear ??????? Oil pressure is higher than water pressure....emulsification of the engine oil is usually down to condensation trapped within the crankcase breather system this will rest at the most upper part of the engine...that being your rocker cover and oil filler cap. If you not convinced that its your H.G gone, carry out a few simple tests. 1, a coolent pressure test (to see if it can maintain a high pressure)a coolent pressure tester will be required for this! 2, Poss missfire on first start up whilst the coolent system is still under pressure(wait for 15 mins or so before starting thus allowing coolent to enter the cylinder chamber) If 2 is present than exhaust gases will also be detected in the coolent overflow bottle and you can get a tester for that also to verify. I assume you have checked your oil level to see if you have lost any...might only be a little. Quote Link to comment Share on other sites More sharing options...
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