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1990 740 Cold Air Intake valve question 700

posted by  garlandw on  Sat Nov 12 12:26 CST 2005
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last visit: Wed Sep 10 08:58 CST 2014
[RELATED]

I checked past messages and the FAQ but could not find whay I am looking for. I checked the cold air flapper valve today to see if it was working. Ambient temperature was 16 C. I idled the car for about 10 minutes but saw no movement in the flapper. The valve appears to be normally open, permitting air in from the exhaust manifold hose. I pushed in on the flapper to the fresh air intake position. It springs back when I release it. I assume that as the intake T increases, the thermostat pulls the flapper back. Maybe it was not hot enough but the exhaust manifold was certainly hot and the hose was warm. Should the flapper have moved in my test or is the movement too hard to see?

I have one of those weather stations given to me as a gift. It has a remote sender for temperature. Hmmmmm. Wonder if it will fit into the air box.....

Bill






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