Jetta GL L4-1.9L DSL Turbo (ALH) (2001)
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Check position of grommet - C - in bulkhead for proper seating.
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Seal flange for coolant pipes to heater core - A - and for expansion valve (to evaporator, only in vehicles with A/C system) - B - at grommet
pass-through - C - with silicon adhesive sealant if necessary (to prevent water from penetrating).
NOTE:
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Sealing rings must always be replaced.
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If hose clamps are deformed, replace them.
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After replacing heater core, coolant must be replaced completely.
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Check coolant circuit for leaks, pay particular attention between coolant hoses and heater core.