Heater blowing cold at low speed

1. user_64763 Established Member Joined: Jun 2013 York Posts: 2134 Citroen Saxo VTR (2001)

   #1 16th February 2015, 07:20

   My heater has started playing up and at low speeds, tends to be below 40ish, the heater blows just cold air even when on Max heat, then as I speed up, give it a minute or 2 and it'll blow nice warm air again!
   Head gasket and water pump was done a year ago so can't really be that.
   Also no set carpets so not heater matrix, maybe it is?
   
   Helpppp it's really annoying
   
   
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2. user_64763 Established Member Joined: Jun 2013 York Posts: 2134 Citroen Saxo VTR (2001)

   #2 16th February 2015, 13:16

   Anyone??
   
   
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3. danny-vts Saxperience Post Whore Joined: Dec 2010 Chesterfield/Nottingham Posts: 7147 dead vts. twisted 106 gti. '03' vtrrrr

   #3 16th February 2015, 14:59

   Thermostat
   re-bleed coolant system
4. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #4 16th February 2015, 15:32

   Air lock,bleed system.
5. user_10418 Saxperience Addict Joined: Jun 2006 Wirral Posts: 13584 Wickerd red VTS MK2, Two tone VTS MK2,vvc Metro..

   #5 16th February 2015, 17:37

   Sounds like air lock to me...
6. user_64763 Established Member Joined: Jun 2013 York Posts: 2134 Citroen Saxo VTR (2001)

   #6 16th February 2015, 18:04

   Awesome! Will try bleeding it!
   
   
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7. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

   #7 17th February 2015, 10:06

   chuck a new thermostat in it, sounds like it stuck open
8. user_64763 Established Member Joined: Jun 2013 York Posts: 2134 Citroen Saxo VTR (2001)

   #8 17th February 2015, 10:30

   Quote:

   Originally Posted by Gandi699 chuck a new thermostat in it, sounds like it stuck open

   
   Was thinking this but it had a new one about a year ago too
   
   
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9. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

   #9 17th February 2015, 10:58

   could still be duff, try it in a pan of boiling water before spending any money. As you've said the water pump is good it sounds like its going a bit cold at idle due to the open stat then once you get the pump speed up a bit warm coolant can flow into the matrix again and you get heat
10. Samuel Frequent Poster Joined: Mar 2011 Posts: 510 MK2 VTS

    #10 17th February 2015, 11:33

    Quote:

    Originally Posted by jbrady72 Was thinking this but it had a new one about a year ago too Sent from my iPhone using Tapatalk

    You can tell if its stuck open. Do the hot water test to see if its stuck closed
11. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

    #11 18th February 2015, 13:35

    Most likely an air lock