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  1. #1
    Committee, Moderator Matt Cole's Avatar
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    Cooling Issue Still 225 engine.

    I posted on here a while back about the cooling system issues im having with the 225 engine and its still going on. With the standard 89 deg stat in, the temp rises to 100 deg (temp took from back of thermostat housing mechanical gauge) and then rapidly drops to say 85 deg. It then repeats the cycle in quick succession. I drilled a 4mm hole in a spare stat and that improved things (bit better regulation) but regulation was still an issue and 90-95 deg on the gauge most of the time. What is strange is that on decelaration in a low gear the temp drops to around 80 deg quite quickly. I have an adjutable fan switch which makes no difference as when its on the temp still rises. It might go off now and again when the water after the stat cools a little. I have tried plenty of stats and they all do the same. The pipework seems to make sense how its piped up. Its a regulation /flow issue i think. Im needing to sort this out before driving the car anymore. Any ideas chaps??

  2. #2
    Non-member Schakal's Avatar
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    Re: Cooling Issue Still 225 engine.

    you aure there is not an airlock or even a faulty sensor or gauge ?

  3. #3
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    Re: Cooling Issue Still 225 engine.

    the 172 thermostat was no better then matt? Might be worth sorting the coolant leak?

  4. #4
    Non-member JRP's Avatar
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    Re: Cooling Issue Still 225 engine.

    I seem to remember reading about this.. somthing about a gasket that the stat sits in becoming dislodged causing a flow restriction.

    If your talking about what i think you are. if not ile get my coat

  5. #5
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by JRP View Post
    I seem to remember reading about this.. somthing about a gasket that the stat sits in becoming dislodged causing a flow restriction.

    If your talking about what i think you are. if not ile get my coat
    Ive got the hat to go with your coat chief!

  6. #6
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by Ashy View Post
    the 172 thermostat was no better then matt? Might be worth sorting the coolant leak?
    Worse mate. With the drilled stat 95 tops but would hover below that. With what we did today its doing the '100 to 85 move'! and then back again. Not convinced on the leak being the culprit but yeah it needs sorting.

  7. #7
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    I think im looking at replacing all the hoses so the standard restrictors will be gone!!

  8. #8
    Non-member Duncan Grier's Avatar
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    Re: Cooling Issue Still 225 engine.

    Water pump in good condition? No blocks in the system inc rad? Sound like when you are using the rad to cool it works but it is getting it through the rad?

    Could be wrong have been, just a few time before lol

  9. #9
    Non-member Adey aka Ewok's Avatar
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    Re: Cooling Issue Still 225 engine.

    whats the running temp ment to be?

  10. #10
    Non-member Duncan Grier's Avatar
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    Re: Cooling Issue Still 225 engine.

    One for PAul B to prob answer Adey - suspect 90deg could be normal

  11. #11
    Non-member Adey aka Ewok's Avatar
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    Re: Cooling Issue Still 225 engine.

    Just thinking it might be a warm running engine that's trying to be over cooled, valvers run hot, the statvon them isn't fully open until 101degs

  12. #12
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    Re: Cooling Issue Still 225 engine.

    the standard 172 stat i 89 degs, nt sure what the 225 is as standard though?

  13. #13
    Honorary Member THE MASTER's Avatar
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    Re: Cooling Issue Still 225 engine.

    get a torch and shine it through the rad . have a look on the other side of the rad and see how mutch grunge / dead flys etc are blocking the air flow

  14. #14
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    The rad is pretty clear and it does cool once the stat opens and lets the cooled water circulate around. The stat at that point must shut quite quickly and the temp rises to 100 deg again. The original stat is 89deg or at least that was what was in it. It does seem like the rad overcools the water to below 89deg and the stat shuts quickly. Im using a 172 rad.

  15. #15
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Im not sure if it is the water pump as the water must circulate when the stat opens and cools to 85deg. Its like there is a lack of flow around the engine and its not being regulated by the stat to keep the temp at around 89deg?

  16. #16
    Non-member Duncan Grier's Avatar
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    Re: Cooling Issue Still 225 engine.

    Is there any difference (much) to the std 225 coolant pipe / rad setup?

  17. #17
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    not sure how the 225 is piped up. I dont think there is any installation diagrams available.

  18. #18
    Non-member Andrew Cooke's Avatar
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    Re: Cooling Issue Still 225 engine.

    I don't suppose it'll be much different to this
    Attached Images Attached Images

  19. #19
    Non-member Andrew Cooke's Avatar
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    Re: Cooling Issue Still 225 engine.

    actually, this might be better
    Attached Images Attached Images

  20. #20
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Thanks Andy. I worked that out to be correct looking at Ashy's spare 172 engine. The thing is on the 225 outlet/bleed no.6 is blocked off. I'm also unsure on where to pipe up the turbo within that circuit.

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    Re: Cooling Issue Still 225 engine.

    New poster! (less than 10 posts)

    Hi i dont know nothing about these engines at all so just a suggestion what are the water pumps like on these? are they a plastic impeller on a metal shaft? basically one of my transits did something similar it turned out to be the impeller slipping on the shaft, it would get quite hot then cool rapidly then hot again the pump wasnt producing enough flow engine got hot stat open and all the cold stuff would mix shut the stat and get too hot again as well as lots of other strange symptoms, sometimes mostly whilst trying to get it diagnosed the van would be ok so the impeller must have gripped sometimes and slipped others etc! as i say i dont know nuffin about them just a thought

  22. #22
    Non-member Mr 5's Avatar
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by Belly View Post
    New poster! (less than 10 posts)

    Hi i dont know nothing about these engines at all so just a suggestion what are the water pumps like on these? are they a plastic impeller on a metal shaft? basically one of my transits did something similar it turned out to be the impeller slipping on the shaft, it would get quite hot then cool rapidly then hot again the pump wasnt producing enough flow engine got hot stat open and all the cold stuff would mix shut the stat and get too hot again as well as lots of other strange symptoms, sometimes mostly whilst trying to get it diagnosed the van would be ok so the impeller must have gripped sometimes and slipped others etc! as i say i dont know nuffin about them just a thought


    great about to say that! realy common fault on VW,intermitent temp issues caused by the plastic impeller on the water pump,not sure if modern renault engines have plastic impelers on asswel?

    worth a investigation i guess

  23. #23
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Well it would make sense to investigate the pump all the same. Shame its driven from the cambelt ! Can anyone offer a dialogies diagram of said part so i can have a look at the component breakdown? If its not too expensive or a chew on i may try and change it.

  24. #24
    Loose Bolts Tuning stuTHC's Avatar
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by MATT C Ringworm Tuning View Post
    Well it would make sense to investigate the pump all the same. Shame its driven from the cambelt ! Can anyone offer a dialogies diagram of said part so i can have a look at the component breakdown? If its not too expensive or a chew on i may try and change it.
    Id be sorting that coolant leak that ashy mentioned before ripping the water pump apart Matt. When i first got my 5 the temp used to be up and down just like you say. Tried everything i could think of at the time, new stat, rad, water pump............it wasn't until i was shown how to make the old coolant bottle top/tyre valve gizmo that i could pressurise the system and discovered a pin hole leak from one of my hoses (on the heater matrix). Sorted the leak and temp problem went away.

  25. #25
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Right chaps i have piped up the cooling system as shown here:

    https://www.rtoc.org/boards/attachmen...5&d=1241638861

    I have put the turbo inline on the heater matrix return. I have no restricters in place. Any comments on issues with doing so?

  26. #26
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    bump

  27. #27
    Non-member i l k e r's Avatar
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by MATT C Ringworm Tuning View Post

    I have put the turbo inline on the heater matrix return. I have no restricters in place. Any comments on issues with doing so?

    Matt, water that goes through the heather matrix is quite hot, do you think it will do a good job of cooling the turbo?

  28. #28
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by i l k e r View Post
    Matt, water that goes through the heather matrix is quite hot, do you think it will do a good job of cooling the turbo?
    I would have thought that the temp would be around 89 deg at any point in the system?

  29. #29
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    Re: Cooling Issue Still 225 engine.

    be hotter than that after the blower marrow!

  30. #30
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    You know when i have looked at it again, i would be pumping hotter water back into the coldest part of the system?

    I really need to see how the 225's are piped up and sort this once and for all!

  31. #31
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by MATT C Ringworm Tuning View Post
    You know when i have looked at it again, i would be pumping hotter water back into the coldest part of the system?!
    Yeah but in terms of volume its gona be feck all... doubt it would make much difference?

    Worth a try surely.

  32. #32
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    i suppose so matey. Would be nice to know for sure though before it all goes back together.

  33. #33
    Non-member stu21t's Avatar
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    Re: Cooling Issue Still 225 engine.

    what about the coolant bottle cap?
    check its releasing at the correct pressure.
    i had loads of grief on my birds bm,turned out it was the bloody cap not holding pressure.

  34. #34
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by stu21t View Post
    what about the coolant bottle cap?
    check its releasing at the correct pressure.
    i had loads of grief on my birds bm,turned out it was the bloody cap not holding pressure.
    Good point, i was using the gt cap and bottle. However, ive got a bottle and cap of another megane. Blue cap bottle with only one feed.

  35. #35
    Non-member stu21t's Avatar
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    Re: Cooling Issue Still 225 engine.

    on the cos theres only 1 bottle outlet like in the diagrams posted above
    then it Ts into the bottom rad hose.
    and the turbo return hose drops straight into the top of the expansion bottle

    and surely the water coming out the heater matrix is cool as its like a rad?

  36. #36
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Stu, can you knock up a quick diagram? Maybe on the attached pdf??

  37. #37
    Trader paul b's Avatar
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    Re: Cooling Issue Still 225 engine.

    Matt....temp on stat is correct and I agree that it sounds like a flow issue....

    pop up some pic's and let us have a peep in case we (royal we) spot something...

    also, have you had the water pump off,,,,,without knowing the history of the engine it may be as simple as a water impeller fell off....
    also seen the auxillary drive belt on the wrong way so it ran a water pump backwards...easy stuff to miss,more so if the engine turned up in bits.....


    also, basic rule of thumb without seeing your pipe work...water pump hose to top of rad....stat to bottom hose on rad..

  38. #38
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by paul b View Post
    Matt....temp on stat is correct and I agree that it sounds like a flow issue....

    pop up some pic's and let us have a peep in case we (royal we) spot something...

    also, have you had the water pump off,,,,,without knowing the history of the engine it may be as simple as a water impeller fell off....
    also seen the auxillary drive belt on the wrong way so it ran a water pump backwards...easy stuff to miss,more so if the engine turned up in bits.....


    also, basic rule of thumb without seeing your pipe work...water pump hose to top of rad....stat to bottom hose on rad..
    Paul, (saviour) is there any diolagies of the pipe set up?? Been looking for info but had little or no joy. I havent checked the pump (stupid yes) Im hoping its just the setup.

  39. #39
    Trader paul b's Avatar
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    Re: Cooling Issue Still 225 engine.

    yup, i'll dig em out after lunch.....also, is yours an R26 or the F1 lump with LSD...just so i put the right info up..

  40. #40
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by paul b View Post
    yup, i'll dig em out after lunch.....also, is yours an R26 or the F1 lump with LSD...just so i put the right info up..
    Just the normal 225 matey 2004/05 i think. I bet the engines are the same??

  41. #41
    Trader paul b's Avatar
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    Re: Cooling Issue Still 225 engine.




  42. #42
    Trader paul b's Avatar
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    Re: Cooling Issue Still 225 engine.

    all the pics so far for megane turbo in here..

    http://s88.photobucket.com/albums/k1...ogys%20megane/

  43. #43
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Paul, massive thanks.

    Ok its not a clear circuit so i need to i.d the pipes for my set up. Which ones are the heater matrix flow and return, the turbo flow and return? I presume the fill tank is at the top left in the pic?

    Paul i know its a tall ask but have your chaps got that section in the workshop manual ala the clio 172 one that Andy Cooke supplied in the PDF attachment? It would be very easy to follow the pipe routes then. (pint will be awarded)
    Last edited by Matt Cole; 30-06-2009 at 13:15.

  44. #44
    Trader paul b's Avatar
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    Re: Cooling Issue Still 225 engine.

    sorry buddy, all that dialogys is on a stand alone Mac.....not linked to email or our internal internet......

    the pics I put up are from the renaultparts system, online dialogys for parts only..


    pipe 15 is top matrix, pipe 3 is lower matrix
    header tank is top left....

    guessing pipe 7 is the turbo side of cooling......don't have a car here to look at, sorry..

  45. #45
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Ok matey, so need to id pipe 4 and where the first pipe of no. 2 goes to?

    Apologies for all the questions.

  46. #46
    Member Woznaldo's Avatar
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    Re: Cooling Issue Still 225 engine.

    Quote Originally Posted by Mr 5 View Post
    great about to say that! realy common fault on VW,intermitent temp issues caused by the plastic impeller on the water pump,not sure if modern renault engines have plastic impelers on asswel?

    worth a investigation i guess
    Ditto on the pump. Missus had a '96 1.4 Polo CL that had some bizarre temp readings and it turned out to be the impeller on the pump had detached! This pump was also driven by the cambelt.

  47. #47
    Non-member Duncan Grier's Avatar
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    Re: Cooling Issue Still 225 engine.

    An option could be to ditch the stock setup and run an external water pump (like an EWP)

    Hope you can track it down though

    DG

  48. #48
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Update:

    Right chaps i have had a good few issues recently which all but one remain! The cooling system is still playing up even after re-routing and re-piping it all as per the previous posts. The leaks seem to be cured and all seems well. The temp is still irratic climbs up to 100 deg, then rapidly drops to about 89 ish, then rapidly climbs back up. Sometimes it hovers around 90 deg whilst driving, but generally its as the cycle described above. Im not sure if its the pump? If the pump wasn't working i presume it would just overheat end of? I have the fan set at 90deg to come on which it does as soon as the stat opens up. Sometimes it goes off, other times it stays on for a couple of cycles. There is cooling happening but no stability or regulation even when driving.

    Help

  49. #49
    Non-member stu21t's Avatar
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    Re: Cooling Issue Still 225 engine.

    are you running a std pully set?
    maybe the waterpumps spinning too quickly and bubbling up the water?
    might need to slow down the pump with a diff pulley,
    if they are all std then ignore me lol

  50. #50
    Committee, Moderator Matt Cole's Avatar
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    Re: Cooling Issue Still 225 engine.

    Update, i have drilled two holes in the stat and banged that in with the revised cooling pipework system. It now stays at around 75deg which maybe a little cool but on a good rag it sits at 82deg ish. Fan comes on at 92 and goes off at 80 odd. Much happier and its not as hot in the engine bay when i was seeing 100 deg temps!! I still dont know what the issue is but at least its stable!

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