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  1. #51
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by Frix View Post
    standard is 92/82 degrees, i think, someone will confirm!
    im assuming you havent read post 45.?

  2. #52
    Non-member Nick k's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    89 degrees winter. 83 degrees i think for summer use. Renault used to carry both in stock years ago!!! Temp is stamped in the end of the stat.

  3. #53
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    For uffk sake, why me

    std fan switch 92/82deg.
    low temp switch 79/65deg.
    semi-low switch 88/79deg.

    after fitting the semi- low temp fan switch i thought id take a look at the one i removed.!
    its a feckin low temp 79/82deg switch! feck knows how that got there because as far as im aware ive alway bought std temp

    what the ffff so on top of the fan not kicking in,ive now raised the temp higher to where the fan "should" kick in
    going to start the car up tomorrow after the batts charged and see what happens.

    feck


  4. #54
    Non-member Brigsy's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Fit a std rad back in

    Seriously though if this is causing problems like this surely the engine will run too cool whilst on the move, probably take ages to warm up too.

    The knock on effect of cool running usually means the engine will hesitate unless you have choke on, these engines run best around the half way mark on temp gauge.

  5. #55
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by Brigsy View Post
    Fit a std rad back in

    Seriously though if this is causing problems like this surely the engine will run too cool whilst on the move, probably take ages to warm up too.

    The knock on effect of cool running usually means the engine will hesitate unless you have choke on, these engines run best around the half way mark on temp gauge.
    no go mate,
    im not about to fork out for a new std rad and its obviously not a good idea buying 2nd hand rads. i cant afford it anyway.

    im sure/hoping its got to be an airlock..
    if the fan doesnt kick in tomorrow after ive re-bled the system i think ill do the tyre valve in a header tank cap mod and pressurize the system!just need a spare tank cap to use
    any ideas of how much pressure to apply?,i'll use a foot pump. and im assuming you do this with the engine off!!

    either way, somethings not quite right yet.
    you would have thought with a low temp fan switch in that the fan would kick in before the temp gauge needle went almost vertical.! this is the reason i suspect an airlock??!!

  6. #56
    Non-member c5 swh's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    im almost certain its a airlock.

    When i did mine the fan cut in later than usual while bleeding it the first time.

    After that it was spot on.

  7. #57
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    *****

    ok today ive done the following-

    fitted a new rad fan switch.
    fitted another working/tested relay.
    bled the system using the tyre valve/pump method.
    ran the car up to temp and....
    the rad fan still doesnt want to kick in!

    yes it WILL work if i simply bridge the fan switch wires,i can here the relay click when i do this too.

    there cant be an air trapped in the system now surely.!

    theres no cool spots on the rad either.
    all hoses are hot.

    just wondering,
    could it be that the coolant simply isnt getting hot enough in the rad to turn the fan switch on? and as mr dave mentioned is hot at the waterpump where the temperature sensor is.? but why would this happen? remember the car is not on the road,im doing all this in my garage so there no air passing throught the rad so you think that the temparture in all areas would be the same??
    maybe a coolant temp sensor fitted to the bottom rad hose will tell me what temp the rad is seeing rather than the waterpump/head.?

    im feeling ill have to fork out for a std rad now and fitting the 1.9d rad/16"spal fan was a waste of time/money.
    i really want the thing to work as it should. ive noted what mr dave has done to his but surely..mr dave if your around??.. you still had your rad fan kicking in.?

    i dont want to fork out for a new std rad and still have the same issues.

  8. #58
    Non-member c5 swh's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    its a confusing one

    where abouts on the temp guage are you expecting it to kick in?(sorry if you have already mentioned this)

    You could try and leave it a little longer than you think just to see if it kicks in,

    obviously i dont mean leave it until its dangerously hot

  9. #59
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by c5 swh View Post
    where abouts on the temp guage are you expecting it to kick in?(sorry if you have already mentioned this)
    theres 4marks, the 4th being hotthott. im letting the needle get to inbetween the 3rd and 4th mark before im having to bridge the fan switch to cool it back down. in my opinion the fan should kick in at least when it gets just past the 3rdmark? maybe a touch sooner?


    Quote Originally Posted by c5 swh View Post
    You could try and leave it a little longer than you think just to see if it kicks in,
    nope,ive tried it and taken it beyond where the fan should kick in. im not going to risk overheating it.

  10. #60
    Non-member Shane P's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Just before the 3rd mark would be ideal.

    You could try bleeding it again, a lot of the time you have to hold the header tank well above the height of the wing and fill it to max, take both bleed nipples out completely and let it run out of them for 20 seconds.

    Level with the scuttle area is just not high enough to bleed properly sometimes

  11. #61
    Committee, Moderator Matt Cole's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Are you using the standard pump pulley and standard thermostat??

  12. #62
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by MATT C Ringworm Tuning View Post
    Are you using the standard pump pulley and standard thermostat??
    yes, std pump pulley.
    and yes a std temp stat but with a 3mm hole drilled in to supposedly aid bleeding

  13. #63
    Non-member Harrison01's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    hey raj im investigating mine tomorrow so will let you know how i got on.

  14. #64
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by Harrison01 View Post
    hey raj im investigating mine tomorrow so will let you know how i got on.
    have you got the same setup as me.? extra van 1.9d rad and header tank located in scuttle.

    im putting the problem down to the rad just isnt suitable for the gtt thinking about it,its the only thing in the cooling system side that isnt std.

    this'll be the last time i try to do something different on the 5 i always find out the hard way.

    time to bite the bullet and get the pennies saved for a new std rad or maybe one of them alloy versions unstablecable is selling.?? feck knows how ill go about mounting the 16"spal fan to a std rad though
    Last edited by raj; 29-01-2009 at 22:51.

  15. #65
    Committee, Moderator Matt Cole's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Raj, what side of the rad is the switch on?? It wants to be in the path of the flowing water exiting from the thermostat, ie when the stat opens you get hot water flowing past it. If the switch is on the opposite end it could be that the water is cooling through the rad before it gets to the switch. Some rads are pretty good at emmiting heat away, sometimes the stat opening and closing at the right points and reacting quick enough can actually keep the engine temp level withought the fan coming to use. This however is down to ambient temp of course. Im wondering if your stat isnt opening enough or quick enough to allow the full compliment of hot water through the rad. When that stat opens, you should see the temp gauge drop quite significantly/quickly. Have you tried another stat or even a reduced temp one?

  16. #66
    Look-Out Kris M's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    OE, FTW has proved itself yet again ( not wishing to sound horrible Raj )

  17. #67
    Committee, Moderator Matt Cole's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Also if all else fails, keep the rad and go for an adjustable, thermostatic switch using a capillary probe and adjust the switch to suite the temp.

  18. #68
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by MATT C Ringworm Tuning View Post
    Raj, what side of the rad is the switch on?? It wants to be in the path of the flowing water exiting from the thermostat, ie when the stat opens you get hot water flowing past it. If the switch is on the opposite end it could be that the water is cooling through the rad before it gets to the switch. Some rads are pretty good at emmiting heat away, sometimes the stat opening and closing at the right points and reacting quick enough can actually keep the engine temp level withought the fan coming to use. This however is down to ambient temp of course. Im wondering if your stat isnt opening enough or quick enough to allow the full compliment of hot water through the rad. When that stat opens, you should see the temp gauge drop quite significantly/quickly. Have you tried another stat or even a reduced temp one?
    rad switch is on the same side as the std rad,but whereas the std rad fan switch is about halfway up the rad,the 1.9d rad is at the bottom and on the side of the rad,it right next to the coolant outlet.
    i havent tried another stat.

  19. #69
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by Kris M View Post
    OE, FTW has proved itself yet again ( not wishing to sound horrible Raj )
    i agree totally, ive never had a prob with oe equiptment its just that i wanted to try something else and thought a bigger rad without an oil cooler would have benefited the gtt. never mind eh

  20. #70
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by MATT C Ringworm Tuning View Post
    Also if all else fails, keep the rad and go for an adjustable, thermostatic switch using a capillary probe and adjust the switch to suite the temp.
    i could, but id need help in source EXACTLY what id need as thing get confusing for me at the best of times.

  21. #71
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    Re: Rad Fan Not Kicking In..!!!!

    out of interest, what is the diesel fan switch rated at ?

  22. #72
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by Scoff View Post
    out of interest, what is the diesel fan switch rated at ?
    ive no idea mate. just to note,im using a gtt fan switch.

  23. #73
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by raj View Post
    ive no idea mate. just to note,im using a gtt fan switch.

    I know, which is used to sitting half way up the radiator, unlike the diesel fan switch

  24. #74
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by Scoff View Post
    I know, which is used to sitting half way up the radiator, unlike the diesel fan switch
    ahh, i see your point now. ill try and see what i can find out

  25. #75
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by Scoff View Post
    out of interest, what is the diesel fan switch rated at ?
    it uses a 92/82deg fan switch.


    just thinking, providing i can find a boss to weld on, could i not mount/relocate the exsisting fan switch to the top rad hose using some stainless pipe with an m22 boss welded on? i though this would be cheaper than buying a fancy type stat?

  26. #76
    Non-member markey b's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by raj View Post
    it uses a 92/82deg fan switch.


    just thinking, providing i can find a boss to weld on, could i not mount/relocate the exsisting fan switch to the top rad hose using some stainless pipe with an m22 boss welded on? i though this would be cheaper than buying a fancy type stat?

    couldn't you just drill and tap a hole in the side of the head, where the blanking plate sits flywheel end?

  27. #77
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by markey b View Post
    couldn't you just drill and tap a hole in the side of the head, where the blanking plate sits flywheel end?
    good idea but i think the way i mentioned would be even easier as i already have a metal pipe as part of the top rad hose. so just have to wip it off and get a m22 boss welded to it. anyone know where i can get one from

  28. #78
    Committee, Moderator Matt Cole's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by raj View Post
    good idea but i think the way i mentioned would be even easier as i already have a metal pipe as part of the top rad hose. so just have to wip it off and get a m22 boss welded to it. anyone know where i can get one from
    Or you could just drop a capillary tube down the pipe, tighten the clip and away you go!!

  29. #79
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by MATT C Ringworm Tuning View Post
    Or you could just drop a capillary tube down the pipe, tighten the clip and away you go!!
    a what? sounds abit posh to me. please explain

  30. #80
    Committee, Moderator Matt Cole's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by raj View Post
    a what? sounds abit posh to me. please explain
    http://cgi.ebay.co.uk/Car-Radiator-C...742.m153.l1262

    Here ya go. Get one of these, attach the switch to the original temp switch wiring, the tube down goes in the rad pipe. Bobs ya auntys fanny.

  31. #81
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by MATT C Ringworm Tuning View Post
    http://cgi.ebay.co.uk/Car-Radiator-C...742.m153.l1262

    Here ya go. Get one of these, attach the switch to the original temp switch wiring, the tube down goes in the rad pipe. Bobs ya auntys fanny.
    ahaa ok.
    but how do you actually fit it in the the top rad pipe.? im not understanding how you just drop it in and tightened your hose clamp back up what about wiring etc? surley you cant just route it out the pipe and clamp the hose down? would this not cause the hose not to seal properly? im obviously not getting the jist of it

    ive found this one that seems to have a few more bits.
    Last edited by raj; 30-01-2009 at 18:59.

  32. #82
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    Re: Rad Fan Not Kicking In..!!!!

    I can nock you up an M22 boss if you want Raj ?

  33. #83
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by Deano View Post
    I can nock you up an M22 boss if you want Raj ?
    sweeeet mate, would be great if you can. how much£? for 2.

  34. #84
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    Re: Rad Fan Not Kicking In..!!!!

    Do you have any idea of the diameters and lengths you need ?

    F.O.C mate !

  35. #85
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by Deano View Post
    Do you have any idea of the diameters and lengths you need ?

    F.O.C mate !
    well F.O.C me

    does m22x1.5 mean anything to you.?

    i estimate the depth would be about 15mm.

    just to add, are all boss faces the same? as in,is there abit of flat surface area for a washer to sit on for when i fit the fan switch?

  36. #86
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by raj View Post
    well F.O.C me

    does m22x1.5 mean anything to you.?

    i estimate the depth would be about 15mm.

    just to add, are all boss faces the same? as in,is there abit of flat surface area for a washer to sit on for when i fit the fan switch?

    Ye mate ! I'm an engineer !!

    Tell me what you need me to make (sketch would be good) and i'll make a couple,

  37. #87
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    Quote Originally Posted by Deano View Post
    Ye mate ! I'm an engineer !!

    Tell me what you need me to make (sketch would be good) and i'll make a couple,
    pm 4u mate.

  38. #88
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    Re: Rad Fan Not Kicking In..!!!!

    PM Raj

  39. #89
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    ive not even attempted to sort this rad fan problem out yet but thanks to big jim racing for making me a stainless boss i can now get on with it

    so,firstly ill be retrying the tyre valve in the header tank cap method to pump an airlock out if there actually is one.
    ill be relocating the rad fan switch to just after the thermostat.
    ive also decided to refit the swirl pot as its obviously there for a purpose i just wanted the minimalistic look. i'll be refitting it behind the scuttle next to the header tank.

    with all that out the way and if the problem is still cured it only leaves the radiator! i really dont want to have to replace the rad for a std one [im by no means doubting the oe rad] as ive spent bloody ages getting it to fit plus mounting a 16"spal fan to it


    also to add, i know this isnt an electrical problem as its been previously suggested i rewire the rad fan via the alternator.
    i know theres no wiring problem as i used another new rad fan switch and connected it up and placed it in boiling water with the cars ignition on.. the rad fan kicked in.

    i learn the fecking hard way all the time never before on any of my previous 5's have i had this annoying problem! i just wanted to try something different with this one. std setup all the way from now on if i decide on another 5 in the future....... which is doubtful.

  40. #90
    Non-member raj's Avatar
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    Re: Rad Fan Not Kicking In..!!!!

    hmm, i only got as far as pressurising the coolant system to hopefully push the suspected airlock out. and its seem to have worked. strange how i didnt work when i tried it previously so the rad fan now actually works it kicks in just below the 3rd mark on the gauge.
    sorted.
    now on with the next issue

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