Webasto BCT010300C Repair Manual download pdf (Page 48)

Coolant Circuit

Webasto Product N.A., Inc. 46 www.techwebasto.com

™

11.Coolant Circuit

UNDER NO CIRCUMSTANCES SHOULD

PURE WATER BE ALLOWED TO ENTER

THE BLUECOOL COOLANT SYSTEM!

Doing so will not ensure proper mixing with antifreeze

which will lead to ice formation in the storage unit and

possibly damaging internal components. ALWAYS

purchase and use a 50/50 premixed glycol based

antifreeze where possible. If a premixed antifreeze is not

available, a pure antifreeze mixed with water at a 50/50

ratio may be used as long as it is premixed BEFORE filling

the system. DO NOT rely on the coolant circulation

system to mix water and antifreeze.

11.1 Bleeding System After Repair

The coolant circuit must be refilled and bled of air after

repairs or replacement of any components within the

circuit.

1. Follow directions in Sec. 10.2 "Air-handler Cover

Removal" on page 44.

2. Remove fill cap from the reservoir and fill system

directly with 50/50 premixed glycol antifreeze

mixture.

3. Open the air bleeder valve on the air-handler’s

exchanger. Refer to Fig. 49, item A. DO NOT leave

this valve open unattended!

4. Continue to replenish the reservoir as coolant is

drawn in.

5. Continue to bleed air out at the bleeder valve until

coolant is evident at the valve. This may take several

cycles to remove all trapped air in circuit. Be careful

not to allow coolant to spill inside sleeper. Use a

catch pan. Close bleeder valve.

6. Check coolant level at reservoir. Top up as necessary.

Figure 49. Coolant circuit bleeding

11.1.1 Energizing the Circulating Pump

To further aid in purging trapped air from the system, the

circulating pump can be energized to circulate coolant

through the system.

1. Connect the harness to the control unit. Do not

install air-handler cover at this time.

2. Restore system power.

3. Turn fan control knob slightly from off position.

4. Turn coolant pump control knob fully on.

5. Carefully bleed remaining air from the coolant

system at the bleeder valve.

6. Once the system has been completely filled and

purged of air, it should hold close to 1.5 - 2 US

gallons depending on coolant hose lengths.

7. Allow coolant pump to continue circulating coolant

for 15 min. During this time, check hose

connections for signs of leakage.

8. Turn system off and install air-handler cover.

CAUTION

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Webasto BCT010300C Repair Manual Page 48

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