Non return valves
The heater bypass hose has a non-return valve, located between the engine feed and return hoses. The valve prevents the water pump from recirculating coolant from the heater at low engine speeds.
The flow indicator arrow embossed on the valve body MUST point towards the coolant header tank.
| CAUTION | Coolant flow will be compromised if either valve is fitted incorrectly. Observe the correct direction. |
A second non-return valve is located in the heater outlet to water valve hose. This valve prevents hot coolant from flowing into the heater with the engine switched off. The flow indicator arrow MUST point towards the water valve.
Heater feed and return hoses
The heater feed and return hoses are connected to the engine feed and return hoses by 'Quick-Fit' connection unions. The feed hose has a Norma R20 connector and the return hose a Norma push and seal connector. The coolant system bleed joints have Cobra clamps. All remaining hose connections have spring band hose clamps.
The engine feed hose is connected to the engine bypass housing and the engine return hose is connected to the engine water pump.
Scheme 67
| Item Number | Description |
|---|---|
| 1 | Cobra |
| 2 | Spring band |
| 3 | Quick-fit |
| 4 | Norma push and seal 'R' type |
| 5 | Norma push and seal 15 |
Refer to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION .
Scheme 68
- Remove upper steering column.
- Drain radiator coolant only.
- Remove footwell lamp mounting bracket. Remove bracket to fascia securing screws. Remove bracket.
- Remove major gauge module.
- Remove fascia support bracket to bulkhead securing bolts (from between air duct and fascia harness).
- Disconnect cool air bypass servo motor connector and heater matrix pipes. Disconnect connector. Remove screws which secure retaining brackets. NOTE: Position suitable cloth to absorb coolant leakage before disconnecting pipes. Remove retaining brackets. Remove screws which secure matrix clamps. Remove clamps. NOTE: Remove and discard O-ring seals from pipes; fit suitable blanking plugs. Displace pipes from matrix.
- Remove heater matrix from heater/cooler assembly. Remove screw which secures heater matrix retaining plate. Remove heater matrix retaining plate. Displace and reposition fascia support bracket to permit removal of heater matrix. Remove heater matrix.