Heater matrix - removal and refitting

Removal
1 With the heater removed from the vehicle as previously described, extract the two securing screws and slide the matrix out of the heater casing.

2 If further dismantling is necessary, cut the casing seal at the casing joint, prise off any securing clips and separate the two halves of the casing.

3 Remove the air flap valves. It should be noted that the lever for the air distribution valve can only be removed when the mark on the lever is in alignment with the one on the gearwheel (see illustration).

12.3 Air distribution valve lever and gear marks (arrowed)
12.3 Air distribution valve lever and gear marks (arrowed)

4 If the heater matrix is leaking, it is best to obtain a new or reconditioned unit. Home repairs are seldom successful. A blocked matrix can sometimes be cleared using a cold water hose and reverse flushing, but avoid the use of searching chemical cleaners.

Refitting
5 Reassembly is a reversal of removal. Take care not to damage the fins or tubes of the matrix when inserting it into the casing. Refit the heater with reference to Section 11.

    See also:

    Pistons and connecting rods - removal and refitting
    1.8 litre (R2A type) Removal 1 With the engine removed from the vehicle, remove the sump and the cylinder head. 2 Check the big-end caps for identification marks and if necessary use a centre-pun ...

    Auxiliary warning system components - location, testing, removal and refitting
    Location 1 The AWS control unit, and (when fitted) the bulb failure monitor, are located behind the glovebox on models up to 1987. 2 On models from 1987, the control and bulb failure modules are ...

    Coolant pump - removal and refitting
    1 Disconnect the battery negative lead. 2 Drain the cooling system. 3 Proceed as follows according to model: SOHC models 4 Disconnect the heater and radiator bottom hoses from the coolant pump. ...