Mk2 1.6 running cold

Discussion in 'Engines' started by Ollie A, Jan 12, 2021.

  1. Ollie A New Member

    Joined:
    Jan 12, 2021
    Likes Received:
    1
    Hi there everyone,

    Just looking for a bit of advice. I bought this golf about a year ago and since owning it it has never run up to temp as it should. I have had everything changed on the engine and even a new head gasket put in it and still this issue occurs and from that I dont get any heat coming into the car from the heater. Does anyone know what might be wrong?

    Cheers
     
    Last edited: Jan 12, 2021
  2. Tristan

    Tristan Paid Member Paid Member

    Joined:
    Apr 25, 2006
    Likes Received:
    967
    Location:
    Southern IRELAND
    Faulty stat? Dodgy gauge or sender?
     
  3. Ollie A New Member

    Joined:
    Jan 12, 2021
    Likes Received:
    1
    Guage does work as it it has overheated befoere and shown that, send was replaced, as well as stat
     
  4. Tristan

    Tristan Paid Member Paid Member

    Joined:
    Apr 25, 2006
    Likes Received:
    967
    Location:
    Southern IRELAND
    I had a 1.8 that wouldn't heat up, turned out to be a corroded seat where the stat sat against, letting coolant bypass it.
     
  5. Ollie A New Member

    Joined:
    Jan 12, 2021
    Likes Received:
    1
    My bottom outer housing is plastic, but could be on the block?
     
  6. costel1969

    costel1969 Paid Member Paid Member

    Joined:
    Jun 4, 2009
    Likes Received:
    435
    Location:
    Canada & Ireland
    When you said you had everything changed on the engine - what exactly has been changed to date?

    When it comes to heating, there are normally just a couple of culprits:
    1. Thermostat
    2. Silted up system - has the system been/ever been flushed and new coolant installed?
    3. Radiator - may be significantly silted up, on a Mk1 GTI that I had, I literally had to pull the radiator out and flush it with a hose for about 30 minutes before I finally got all the rust and gunk out of it, replaced the coolant and thermostat after that and I had loads of heat.
     
    Last edited: Jan 12, 2021
  7. Tristan

    Tristan Paid Member Paid Member

    Joined:
    Apr 25, 2006
    Likes Received:
    967
    Location:
    Southern IRELAND
    Yes, the upper side which is part of the water pump housing on a big block.
     
  8. Ollie A New Member

    Joined:
    Jan 12, 2021
    Likes Received:
    1
    Hi, to date I have had changed:
    - All coolent hoses
    - Head Gasket
    - Water Pump
    - Themostate mulitple times
    - Water Pump
    - The head was reconditioned
    - Heater Matrix bypass
    - Multiple coolent flushes as well

    I have had the rad out and flushed it when i got it but still nver ran right
     
  9. costel1969

    costel1969 Paid Member Paid Member

    Joined:
    Jun 4, 2009
    Likes Received:
    435
    Location:
    Canada & Ireland
    Well in fairness that's a lot of work (and expense) - the only other thing I can think of and it's unlikely is a possible air lock/bubble in the system.
    It can happen but I'm presuming that the system was correctly 'burped' to ensure that there was no air trapped
     
  10. Ronan Halpenny New Member

    Joined:
    Dec 27, 2020
    Likes Received:
    17
    Did you remove the heater matrix bypass setup or replace it?
     
  11. PhilRyder

    PhilRyder Paid Member Paid Member

    Joined:
    Oct 17, 2020
    Likes Received:
    501
    Location:
    Surrey
  12. Tristan

    Tristan Paid Member Paid Member

    Joined:
    Apr 25, 2006
    Likes Received:
    967
    Location:
    Southern IRELAND
    Is it actually running cold, or just not getting warm in the cabin?
    Is the fan cutting in? Where does the gauge sit?
    Tbh it sounds like either a blocked heater matrix, or the covering miss off the heater flaps.
     
  13. Ollie A New Member

    Joined:
    Jan 12, 2021
    Likes Received:
    1
    Yep was filled correctly, but I even replaced the themostate again, and refuilled the coolent to have teh same issue. I thought it could be a dodge temp sensor, so will purchase a new one soon.
     
  14. Ollie A New Member

    Joined:
    Jan 12, 2021
    Likes Received:
    1
    They got rid of the bypass setup and just rplaced with stainless steel pipe.
     
    Ronan Halpenny likes this.
  15. Ollie A New Member

    Joined:
    Jan 12, 2021
    Likes Received:
    1
    Not getting warn into the cabin and the fan is kicking in, so makes me think it is a faulty guadge or sensor at this point. Have had a lot of the foam come through the vents over the past year, but not sure how that would help replacing it. Not the best when comes to the heater knowledge.
     
  16. Ronan Halpenny New Member

    Joined:
    Dec 27, 2020
    Likes Received:
    17
    If the foam is gone from the flaps the heat will just escape in to space. The flaps have big weight saving holes in them so even if they are closed the air will just pass through the holes.

    Essentially none if the warm air is being directed through the various channels to the foot well, dash vents etc.

    Mind you dont get any of that foam in your eyes! Nasty stuff! Personal experience.
     
  17. Ollie A New Member

    Joined:
    Jan 12, 2021
    Likes Received:
    1
    Have already experienced thats. Hurts like hell. Is it all easy to replace or is a week job? and would this mean that you wouldnt be able to feel the air as hot as it should be?
     
  18. Tristan

    Tristan Paid Member Paid Member

    Joined:
    Apr 25, 2006
    Likes Received:
    967
    Location:
    Southern IRELAND
    Ollie A likes this.
  19. Ollie A New Member

    Joined:
    Jan 12, 2021
    Likes Received:
    1
    Thank you. This was very helpful. Think this might be it for the cabin issue.
     
  20. Tristan

    Tristan Paid Member Paid Member

    Joined:
    Apr 25, 2006
    Likes Received:
    967
    Location:
    Southern IRELAND
    If you could get a spare set of flaps from the likes of Dubstock, and have them cleaned, recovered and glued for a few days, you'd do a heater box refresh in a night.
    The usual practice is to replace the heater matrix at the same time.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice