Volvo 700 Heater system/Fresh air unit
A cool cabin despite a warm engine, or a sweet smell of coolant under the instrument panel, usually points the same way: a stiff heater valve or aged heater hoses on the Volvo 740, 760 and 780. This category gathers the parts around the heater core itself and the fresh-air supply, so flow to the element can be restored without tearing out the whole panel.
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The group includes heater valves (control valve for the cabin heat), heater hoses and damping hose, fixed pipes plus clamps and fasteners for mounting. There is also a pulley belonging to the system's drive. During a refurbishment, a typical check point is the transitions between hose and pipe – dry, cracked rubber hoses and slack clamps are a common cause of leaks, and a sticking heater valve gives uneven temperature in the cabin. Replace hose and clamp in pairs so you don't have to come back to the same joint.
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