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New thermostat but no hot air

Steve s Aug 2, 2020 at 12:41 AM

  1. Steve s

    Steve s New Member

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    Hi all . Put New thermostat in 2.0tfsi b7 but no hot air unless driving
     
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  3. I'm Just Rob.

    I'm Just Rob. Moderating or something, Staff Member Moderator Gold Supporter VCDS Map User

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    Not an uncommon problem with B7's after working on the cooling system.
    If you have normal operating temp and your temp gauge is reading dead on 90 then you will most likely have an air lock at the heater matrix or very close by.
    You'll need to vent the system fully to clear the problem.
    If you've done that and 100% sure you're free from air pockets then look at your climate control, but most likely you have the pesky B7 air pocket problem.
     
  4. Steve s

    Steve s New Member

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    Car is running at 90 fine no problems . As before new stat was reading 70 . have just bleed it from the hose near the bulkhead with the bleed hole . Wasnt lots off air but enough I think . So far so good hot air again . Will test it going to work at 5 and home in morning . Hopefully its sorted it . Thanks again rob . Will keep updated in morning .
     
    Sidrick likes this.
  5. I'm Just Rob.

    I'm Just Rob. Moderating or something, Staff Member Moderator Gold Supporter VCDS Map User

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    No probs, it only takes a small air lock to cause this problem, glad you have sorted it.:icon thumright:
     
  6. BakPak

    BakPak No Gear

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    I'm fortunate having a steep drive way so when I replaced the thermostat the header tank was higher than the heater matrix so the system bled itself of air.
    On level ground the top hose for the heater matrix is higher hence air locks.
     
  7. Steve s

    Steve s New Member

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    Drive home from work this morning. the hot heaters was lovely . Temps are still fine. Fingers crossed all sorted now .
     
    BakPak likes this.

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