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Hot/Cold Air Valve In Airbox[850/1993] posted by John Brady on
Sunday, 17 May 1998, at 12:51 a.m.

Hi... I read a post a month or two back where someone said they successfully modified the valve in the airbox to take in only cold air. Unfortunately, the post is no longer on the board. I live in a fairly warm climate, and wondered how to do this. I did take the air box apart and noticed how it works with the springs, etc. Does anyone know how to do this and/or know if it will help increase hp?


Re: Hot/Cold Air Valve In Airbox[850/1993] posted by Steve Seekins on
Friday, 22 May 1998, at 8:45 a.m.

There is generally no need to modicy this flapper valve. There is a thermostat device that keeps the flapper closed to the hot air in warm weather or when the engine compartment is warm. The only problem is that occasionally the thermostat fails and needs to be replaced. Just check it everytime you check/replace your air filter. There is a potential to damage your air mass meter of this flapper stays open for extended periods.
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Steve Seekins, Re: Hot/Cold Air Valve In Airbox[850/1993] posted by Barry Robinson on
Friday, 22 May 1998, at 12:39 p.m.

Steve-Is there a thermostat/air direction flap on the 96,97 850's (non turbo?)
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Barry


Re: Hot/Cold Air Valve In Airbox[850/1993] posted by Steve Seekins on
Friday, 22 May 1998, at 1:00 p.m.

Not all the cars have them. Easy way to tell is to look for the silver foil flex hose about 3" dia leading from the air filter housing to the exhaust manifold. There would also be a sheet metal piece around the exhaust manifold that the hose attaches to. Of cours this method of checking only works if the PO didn't remove an old damaged preheat hose without replacing it.

As noted, the whole affair can be removed including the hose, brackets, rattling sheet metal piece and thermostat. Only requirement is to permenantly close off the port on the filter housing either by replacing thermostat with solid piece, or making a cover for the port and taping it on. The idea is that you do not want warm engine compartment air to enter the air filter housing. The only drawback to removing the system is that the engine will take longer to warm up in cold weather.
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Steve Seekins, Re: Hot/Cold Air Valve In Airbox[850/1993] posted by John Brady on
Saturday, 23 May 1998, at 4:54 a.m.

Steve,

How do you check that the thermostatic valve is working correctly? With the engine turned off and airbox removed (warm weather), the flap seems to be in a position which allows the hot air to come in..... Does this change when the engine is turned on? I see that by pressing the pin against the spring inwards toward the flap, the flap switches to cold air. But it seems to be locked in a position which allows hot air in. I am not exactly sure how this works and how to check operation.... Please let me know. Thanks.


Re: Hot/Cold Air Valve In Airbox[850/1993] posted by John Brady on
Saturday, 23 May 1998, at 8:31 p.m.

I finally figured out how the valve works by reading the haynes manual. What position is the valve supposed to be in when the air temperature is about 80 degrees F? At this temperature (room temperature), my valve is completely open towards the hot side only. I suspect this may be a faulty valve.... The pin does move slightly when heated up near a gas burner, but I cannot believe that the temperature of the air in the box needs to be this high before it starts letting in cold air.... It still seems faulty to me....




 


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