Overheating when run

1. icgrup Newbie Joined: Mar 2005 Spain Posts: 9

   #1 7th July 2011, 01:22

   Hi! I try to explain the overheating problem of my '00 VTR.
   
   I've changed thermostat(OEM),coolant sensor,radiator,antifreeze(OEM) and bledding much times, and here is the problem.
   
   When idling temp ok all the time, when running slowly (in city or open track but down 3k rpm) temp ok, but when in motorway at middle-high speed or high rpm, temp goes up slowly but constant to red zone. When i turn back to slow, temperature raises low down to normal zone (in the middle of gauge).
   
   I don't understand what's happening in this car....i've changed everything but seems to be the same...
   
   
   P.D. Sorry for my english, i don't practice so much here in spain
2. VenoMNL Infrequent Poster Joined: Dec 2008 Lisbon - Portugal Posts: 189 Citroen Saxo VTS 1.6i 16v Turbo Renault Express 1

   #2 7th July 2011, 01:59

   get a oil radiator.. lowering oil temp, you lower water temp..
   
   but its still strange
3. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #3 7th July 2011, 13:26

   either your headgasket is gone
   
   or you water pump isnt working
4. Stevo123 Established Member Joined: Apr 2009 Redcar Posts: 1971 2000 Posi Blue vtr

   #4 7th July 2011, 14:04

   Quote:

   Originally Posted by blackie_2k5 either your headgasket is gone or you water pump isnt working

   Good points^
   
   Also possibly your radiator has corroded so does not have the surface area of the cooling fins to keep the temps down when the engine is working hard.
5. Venns Established Member Joined: Jan 2011 Bridgwater, Somerset Posts: 1092 2001 Saxo 1.1

   #5 7th July 2011, 16:06

   Check your head gasket to be safe, my guess would be the radiator or fan belt.
6. Stevo123 Established Member Joined: Apr 2009 Redcar Posts: 1971 2000 Posi Blue vtr

   #6 7th July 2011, 16:19

   Quote:

   Originally Posted by Venns Check your head gasket to be safe, my guess would be the radiator or fan belt.

   No fan belt - fan is electric on Saxo (and most cars built after the 70's!)
7. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #7 7th July 2011, 16:30

   an is irrelevant on the motorway anyway, at that speeds that is where your car is cooling best, so if youve not got a headgasket or water pump issues, then youve got a blockage in the cooling system
   
   quite possibley as pointed out...the radiator
8. icgrup Newbie Joined: Mar 2005 Spain Posts: 9

   #8 7th July 2011, 22:24

   Radiator is new, water pump don't have leaks and have 2 years mounted, i've changed when changed the timing belt. No water consumition. No leaks.
9. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

   #9 7th July 2011, 23:48

   Have you bled the heater matrix properly? I had this problem on a saxo I serviced a couple of years ago. When the heater matrix was airl-ocked the car would over heat, once I had removed the pipes, let the airlock out, filled it with coolant and quickly put the pipes back on all was fine.
10. user_47680 Infrequent Poster Joined: Oct 2010 Cornwall Posts: 236 2001 Saxo VTR

    #10 8th July 2011, 00:07

    Did you use a header tank to fill the system? Pretty sure one is need to stop airlocks in the matrix as Gandi699 has explained.
11. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

    #11 8th July 2011, 00:29

    Quote:

    Originally Posted by rumble291 Did you use a header tank to fill the system? Pretty sure one is need to stop airlocks in the matrix as Gandi699 has explained.

    Yeah that method above or blow it through yourself using your mouth to put it under a little pressure to force the air out. Be careful if you do that though, coolant is poisonous if you swallow it
12. VenoMNL Infrequent Poster Joined: Dec 2008 Lisbon - Portugal Posts: 189 Citroen Saxo VTS 1.6i 16v Turbo Renault Express 1

    #12 8th July 2011, 02:37

    Quote:

    Originally Posted by icgrup Radiator is new, water pump don't have leaks and have 2 years mounted, i've changed when changed the timing belt. No water consumition. No leaks.

    2 years is enough time to make the teeth's disappear lol
13. Quick Saxperience Post Whore Joined: Mar 2003 United Kingdom (England) Posts: 7064

    #13 8th July 2011, 08:39

    Does the overheat light come on?
    
    Could be a faulty temp gauge? Temp sensor??
14. icgrup Newbie Joined: Mar 2005 Spain Posts: 9

    #14 11th July 2011, 14:31

    what is the matrix?? the water pump have 2 years but only 1.000 miles....
15. icgrup Newbie Joined: Mar 2005 Spain Posts: 9

    #15 12th July 2011, 21:05

    Quote:

    Originally Posted by Quick Does the overheat light come on? Could be a faulty temp gauge? Temp sensor??

    Sensor & gauge are both new
16. icgrup Newbie Joined: Mar 2005 Spain Posts: 9

    #16 21st July 2011, 23:29

    nobody knows?? help please!!
17. icgrup Newbie Joined: Mar 2005 Spain Posts: 9

    #17 26th July 2011, 23:45

    Only remains to change water pump & coolant sensor (blue)...coolant sensor (brown) have changed yet.
    
    Help!!
18. chinkostu Saxperience Post Whore Joined: Aug 2008 The wrong carpark Posts: 5152 Xantia 1.9TD

    #18 27th July 2011, 08:21

    definately bled it right? i thought i'd bled one properly until the radiator started boiling!!
19. REVO_OTE L-plater Joined: Jul 2011 Hampton Posts: 89 02 Ice Grey Saxo Furio/VTR

    #19 27th July 2011, 11:23

    Sounds like a blockage in the system somewhere, as said make sure the system is bled of all the air.

    1 user thanked this post: icgrup
20. icgrup Newbie Joined: Mar 2005 Spain Posts: 9

    #20 29th July 2011, 09:58

    Yesterday i replace the coolant sensor (blue in the head), but when i take off the old one, no coolant in the hole...pug official service tolds me that it's normal, because it's a thermal sensor (works with head temperature, not coolant temperature), anybody knows that??