
Lock washer 10.5 for Volvo PV, Duett, Amazon, 140, 240, 260, 740, 760, 780, 940, 960, S40, S90, V40, V90
PV 444, PV 544, Duett, Amazon, 1800, 140, 164, 240, 260, 740, 780, 760, V90, 960, S90, 940
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Weak cabin heat, a heater valve dripping coolant or a control that no longer regulates the temperature are classic symptoms on the late 164 cars. When the vacuum bellow loses its seal the air shutters stop responding, and then turning the controls rarely helps.

PV 444, PV 544, Duett, Amazon, 1800, 140, 164, 240, 260, 740, 780, 760, V90, 960, S90, 940

PV 444, PV 544, Amazon, 1800, 164

PV 444, PV 544, Amazon, 1800, 164

PV 444, PV 544, Duett, Amazon, 1800, 164

Amazon, 1800, 140, 164, 240, 260, 740, 780, 760, V90, 940, 960, S90, 850, V70, XC70, S70, C70

Amazon, 1800, 140, 164, 240, 260, 850, V70, XC70, S70, C70

PV 444, Duett, PV 544, Amazon, 164, 780, S90, S70, C70

PV 444, PV 544, Duett, Amazon, 1800, 164, 780, S90

PV 444, PV 544, Duett, Amazon, 1800, 164
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This group includes parts for the entire circuit: heater valves, vacuum bellows for shutter control, heat hoses and T-Pipes, grommets, plus screws and washers for mounting. There are also repair kits that let you refresh an existing unit instead of replacing everything.
A common inspection point during restoration is that the area around the heater valve often starts to weep where the hose meets the T-Pipe – replace the hose, valve and seal at the same time so you avoid recurring leaks and a foggy windshield. These parts apply to late 164 cars with the updated instrument panel.