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:

    Cylinder head and pistons - decarbonising
    1 With the cylinder head removed as described in Section 7, the carbon deposits should be removed from the combustion surfaces using a blunt scraper. Take great care as the head is of light alloy ...

    Fuel pump - cleaning
    Note: Refer to the warning at the end of Section 1 before proceeding. 1 On certain early models the fuel pump has a detachable cover allowing access to the internal filter for cleaning. If this ty ...

    Cylinder head - removal and refitting (engine in vehicle)
    Note: Refer to the warning at the beginning of Section 5 and the note at the beginning of the following Section before proceeding. The cylinder head must not be removed when the engine is warm. R ...