| Rules for cleanliness when working on the auxiliary heater and the fuel system |
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| Thoroughly clean all joints and connections and the surrounding areas before dismantling. |
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| Place parts that have been removed on a clean surface (use sheeting or paper, but not fluffy cloths) and cover. |
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| If the repair is not carried out immediately, cover or seal the components. |
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| Only fit clean components: |
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| Only remove genuine service parts from their packages immediately before installing them. |
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| Do not use components which have been stored unpacked (e.g. in a toolbox). |
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| If the fuel system is open: |
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| Do not work with compressed air. |
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| Do not move the vehicle. |
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| Do not start the engine. |
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| Do not switch on supplementary heater. |
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