temp gauge reading low

1. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #1 23rd November 2012, 15:07

   Noticed my temp gauge is only reading 1/4 even when i know the cars running hot it doesnt move any higher? I take it its one of the coolant temp sensors? Ive changed the one on the thermostat so just checking with u lot it will be the other 1?
   
   Cheers
2. Cam Saxperience Post Whore Joined: Nov 2010 Kent Posts: 8439 Gen 7 Celica 190.

   #2 23rd November 2012, 15:14

   Have you got a thermostat?
3. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #3 23rd November 2012, 15:58

   Quote:

   Originally Posted by Cam Have you got a thermostat?

   Yeah I have?
4. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #4 23rd November 2012, 18:40

   Iirc the blue sensor on the thermostat housing controls the gauge reading mate.
5. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #5 23rd November 2012, 19:46

   Thats the one ive swapped over but its still the same might just try the other since theyre cheap enough
6. vts_chris Newbie Joined: Jan 2011 West Bromwich Posts: 20 2000 X reg saxo vtr

   #6 23rd November 2012, 20:21

   Try the other and if it still reads the same possibly a faulty gauge?
7. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #7 23rd November 2012, 20:34

   fit a new thermostat
8. Baz Saxperience Hardcore! Joined: Nov 2005 Coventry Posts: 17782 Fiesta ST150

   #8 23rd November 2012, 21:07

   mine always used to read 1/4, hot as it went unless I went into traffic
9. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #9 23rd November 2012, 21:22

   Quote:

   Originally Posted by Baz mine always used to read 1/4, hot as it went unless I went into traffic

   It used to read 1/2 to 3/4 most the time though so somethings not quite right.. Ill give the thermostat and sensor a go
10. Kirky Regular Poster Joined: Oct 2010 medway Posts: 314 saxo mk2 desire

    #10 24th November 2012, 09:30

    Quote:

    Originally Posted by blackie_2k5 fit a new thermostat

    This the thermostat maybe stuck open
11. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

    #11 24th November 2012, 14:53

    Ive been doing some research and have found the heaters wont blow as hot if the thermostat is stuck open but mine blow red hot?
12. Skitts123 Regular Poster Joined: Jan 2012 Norwich Posts: 453 Saxo Mk2 Vtr (sold) 106 gti

    #12 24th November 2012, 18:04

    I have this same problem unsure what it is as when i brought the car it was fine and now it's started doing it.
13. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #13 24th November 2012, 19:33

    Quote:

    Originally Posted by Ben_SaxoForte Ive been doing some research and have found the heaters wont blow as hot if the thermostat is stuck open but mine blow red hot?

    not true
    
    is in some cases but not all
14. AdamH Saxperience Forum Bum Joined: Oct 2004 South Posts: 3638

    #14 24th November 2012, 20:27

    feel the water pipe from the thermostat behind the engine, if it gets warm then its opening, so could in theory just be stuck open and taking longer to heat up..
    
    when you say it doesnt move above 1/4 is this when driven then left to idle for a bit? or just driving?
15. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #15 24th November 2012, 20:55

    its most likely stuck open
    
    so never gets up to temp right by the gauge, but still blows hot air
    
    my van is the same atm, just need to change the stat,
16. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

    #16 24th November 2012, 21:32

    Ah right i see, thanks for all the help ill swap it over and see how it goes
17. samstar Newbie Joined: May 2011 gravesend Posts: 16 Saxo vtr/vts conversion

    #17 25th November 2012, 22:47

    Quote:

    Originally Posted by Ben_SaxoForte Ah right i see, thanks for all the help ill swap it over and see how it goes

    defiantly thermostat mate had the same problem
18. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

    #18 28th November 2012, 15:28

    Swapped it over and its now running hotter at halfway which is better, just my sticky revs problem left now..
    
    Cheers all
19. samstar Newbie Joined: May 2011 gravesend Posts: 16 Saxo vtr/vts conversion

    #19 29th November 2012, 00:55

    Quote:

    Originally Posted by Ben_SaxoForte Swapped it over and its now running hotter at halfway which is better, just my sticky revs problem left now.. Cheers all

    no worrys your sticky rev problem is your idle control valve well that's what my problem was when my revs were sticking anyways try taking it of and really cleaning it hand then see what happens