Volkswagen Golf Service & Repair Manual: Bleeding coolant circuit of auxiliary heater
| The removal and installation procedures for the auxiliary
heater and the circulation pump -V55- described in this Workshop
Manual ensure that only a small quantity of air enters or
remains in the coolant circuit. Therefore it is not necessary to
bleed the coolant circuit completely after removing and
installing the auxiliary heater or the circulation pump -V55-. |
| However, if a large quantity of coolant has escaped due to
another problem, e.g. a leaking hose, or after coolant pipes
have been renewed, the coolant circuit must be bled
→ Rep. gr.19. |
| After bleeding and filling the coolant circuit, additional
bleeding of the auxiliary heater and the circulation pump -V55-
must be performed as described below. |
| Bleed coolant circuit of auxiliary
heater. |
| – |
To prevent running dry, fill circulation pump -V55- with
coolant. |
 Note
| As only a small quantity of coolant escapes from the coolant
circuit during removal and installation of the auxiliary heater
or circulation pump -V55- (described earlier), and only a small
quantity of air remains in the coolant circuit during
installation (auxiliary heater and circulation pump -V55- are
already filled with coolant during installation), the system
only needs to be bled as described below. |
| – |
Fill coolant expansion tank with coolant as far as upper
mark. |
| – |
Activate circulation pump -V55- via final control diagnosis
function → Vehicle
diagnostic tester in “Guided Fault Finding” mode.
This will bleed coolant circuit from heat exchanger in heater
and air conditioning unit to circulation pump -V55-
additionally. |
| – |
Start engine and choose the highest available setting for
temperature (“HI”) on operating and display unit for heater and
air conditioning system. On vehicles equipped with Climatronic,
turn rotary knobs to “HI” position (for driver and front
passenger sides). |
| – |
Run auxiliary heater at full load for at least 2 minutes
(circulation pump -V55- is actuated). |
| – |
Run engine at high idling speed (approx. 2000 to 2500 rpm)
for at least 2 minutes. |
| – |
Switch off engine and auxiliary heater. |
When the engine is warm, the cooling system is under pressure. Danger of
scalding due to steam and hot coolant. There is a risk of injury to the
skin and parts of the body due to scalding.Always wear safety
gloves.Always wear safety goggles.Proceed as follows to release the
pressure: cover the cap of the coolant expansion tank with a cloth, and
open it carefully.
| – |
Check coolant level in coolant expansion tank and top up
coolant if necessary
→ Rep. gr.19. |
|
|
|
Note
Currently, only the auxiliary heater function is available.
At the moment the auxiliary heater is not intended to be
operated as a supplemen ...
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