Small foam pieces blowing from vents

[78F350]

Originally Posted by Gelbster

It isn't disabling it.It is a seasonal shut-off.Manually operated Was common on older cars .
At least replace the aging heater control valve?
The listed parts will operate with vacuum exactly like the original part and last longer,without the P-car tax:
"Napa sell a vacuum-operated part that looks similar to the OEM part and is mainly metal with a better crimp:
BK 6601410.
But Four Seasons or Everco sell an all metal vacuum controlled heater control valve that may fit??? It is part # 74671. This valve also fits Audis + some 90's Fords according to Posts in other Forums. The Porsche 944/968 guys use it as an upgrade. "
The OEM part # is (but check!) 92857457303. It is $30. But it is all plastic and glued together.

I think that I understand your intent. I just don't see the need. I checked through PET and did some searching. I don't think that our cars (986s) have that valve. The circulation through the heater core is constant and not regulated. There is a similar vacuum controlled valve for the transmission cooler on the tiptronics, but nothing for the heater core.
Sure, you could put a manual valve in and operate it seasonally. That brings back memories of working in government buildings that had a date set to change from heat to AC and back regardless of the temperature. I did in fact have my 1978 F350 rigged for manually opening a flap under the hood to circulate through the heater core. My Boxsters all operate correctly via the climate control panel.