Quote:
Originally Posted by RichardJ
It's a one-way check valve. At wide open throttle, manifold vacuum drops to near zero. Without the canister, the AC mix and defrost doors would return to a default position. The canister acts as a reservoir to keep the doors from moving with varying engine loads. The one-way valve keeps the canisters vacuum pressure from bleeding back to the manifold.
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Hey Richard. Do you know if the round ball replacements have an internal check valve? I been using one without. I wonder if my recirculating vent is moving open and closed and I'm not noticing. Need to check that out.
Kind of mute for me since I'm fixing my original. But it was pretty lame of me not to realize the need.
j