1. MoparDan

    MoparDan Well-Known Member

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    What's the name of this part (it needs to be replaced) IMG_20190221_142027.jpg
     
  2. volare 77

    volare 77 Well-Known Member

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    I don`t think that part is sold separately. Arizona parts shows a used housing for sale
    4227092 AIR CLEANER BODY,PU 4306361 SOP S SIDE OF A2 1985 M BODY 1 ATAA 35
     
  3. volare 77

    volare 77 Well-Known Member

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    I have heard of them being called Air Cleaner Vacuum pod or Hot air actuator but I don`t know the name listed in the mopar parts book.
     
  4. Darth-Car

    Darth-Car Well-Known Member

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    That would be a vacuum motor.
     
  5. Justwondering

    Justwondering Well-Known Member

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    And what is the purpose of the vacuum motor?
    JW
     
  6. 89.Fifth

    89.Fifth Well-Known Member

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    It's hooked up to a temperature controlled vacuum switch. When the car is cold engine vacuum will pull the trap door shut and pull in hot air from the flexible metal hose underneath that runs to the exhaust manifold. When the car heats up the vacuum goes away and the trap door opens to let cool air from the outside into the air cleaner.
     
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  7. Aspen500

    Aspen500 Well-Known Member

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    It doesn't appear it was considered a replaceable part. There is no p/n listed in the catalog, only air cleaner base which includes the actuator. In earlier years it was a serviced part. I remember replacing those on mainly Fords (as a Ford dealer tech), but also on Mopar and GM vehicles "back in the day".
    Didn't see any aftermarket ones currently available. They may have been at one time.
     
  8. Justwondering

    Justwondering Well-Known Member

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    That silver expanding aluminum hose ... I have a replacement one I need to put on my car.
    Thanks for the info.

    JW
     
  9. jasperjacko

    jasperjacko Well-Known Member

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    I don't think you even need it in a warm climate
     
  10. Aspen500

    Aspen500 Well-Known Member

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    Only time you really need the hot air intake is below 50 degrees, especially if it's humid, damp or raining. Even at 50 degrees ambient you can get carburetor icing. The venturi effect drops the air temp below freezing and if the air is wet,,,,,,,,,ice. Everything seems fine until you let off the throttle and the engine stalls because the idle ports are blocked by ice, or you don't slow down because the throttle plates are stuck open with ice. Of course, it (hot air intake) helps when it's COLD cold, like Wisconsin cold, also.
     
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  11. 89.Fifth

    89.Fifth Well-Known Member

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    Strange I never had this happen even when it was in the single digits here. Same for factory setup or for my edelbrock 4bbl. Although starting was a lot harder without an accel pump in my old 2bbl.
     
  12. SixBanger

    SixBanger Well-Known Member

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    How can an acceleration pump help easier starting an cold engine? Since there is no heat to evaporate the fuel.
     
  13. Rustyroger

    Rustyroger Well-Known Member

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    It squirts extra fuel down the venturi, much like an enrichment device. some of the fuel will form a mist as it gets sucked past the inlet valve, it will help fire up a cold mixture.

    Roger
     
  14. SixBanger

    SixBanger Well-Known Member

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    Okay! I expected that this would have minimal effect and mainly the choke served for cold starting.
     
  15. 89.Fifth

    89.Fifth Well-Known Member

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    The flash point of gasoline is about -50F so as long as it's warmer than that, the fuel is going to evaporate in the manifold and be combustible.
     
  16. BudW

    BudW Moderator Staff Member

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    MoparDan, basically all that has been said is true. That is a vacuum motor that allows hot air entry from the exhaust manifold heater. It allow for better cold weather drivability for those colder areas (up North).

    Sense you live in an area where freezing cold weather is not an issue, you can disconnect that entire circuit (put a rubber plug on the carburetor nipple). The black (or silver) corrugated hose (2 inch / 5 cm diameter) can be removed. By default, the vacuum motor only opens when it is cold, so being disconnected will not affect anything – where you are at (in sunny Florida).
    Up North, it is a “must have” item.

    Where I live at, Oklahoma City, OK, we do get both extremes. Last February, our average temperature was below freezing (I think the avg was 29’ F / -2’ C). In August, it can get well above 110’ F (43’ C). Yesterday, we had 80 MPH (130 kph) winds to tend to. In about 2 months, it will be officially tornado season here.


    To be honest, I don’t see a lot of those vacuum motors fail. I might even have a spare in my garage – if a person really wanted to replace it. Pretty much all of Chryslers air cleaner vacuum motors will work for a replacement (if it looks similar – then it might fit and work fine) – but there are a couple of differences over the years.

    There is a temperature switch that turns on that vacuum motor, that is located inside of the air cleaner. The hose from carburetor goes to the temp switch first, then goes to the vacuum motor on air cleaner.
    20170315_160612m.jpg
    On an unrelated note: there are different temperature ratings for the switch, and different paint stripes indicate the temp switches on at. I think Chrysler used about 5 different temp ratings on those switches (but not sure why).
    4131147 Air Cleaner Switch.PNG
    Blue / Red for this one.

    Dual snorkel air cleaners use a similar vacuum motor for other side (second snorkel) but it only opens when engine vacuum is low – to reduce engine noise (open only during WOT (Wide Open Throttle)).
    AC 74 440.PNG
    The greet arrow (temp door motor) is the same as the second door motor (purple arrow). The second door stays closed unless extra air is needed.

    Some mid/late ‘80’s 4-bbl M’s have a second vacuum motor on the side of air cleaner (black arrow, below). That motor closes off the snorkel when car is turned off, to keep fuel vapor inside air cleaner – to comply with fuel vapor emissions (on 4-bbl cars). I’m not sure why that wouldn’t also apply to 2-bbl cars – but I’ll avoid going down that road.
    AC 001.jpg


    For giggles, I found this picture online. He found the reason for poor performance (Jeep). iuVTSEEZLE.jpg
    BudW
     
  17. BudW

    BudW Moderator Staff Member

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    JustWondering, the hose is sold by O’Reilly auto parts (and others) as an emission control duct.
    Gates # 28095, which is 2” inner diameter and 18” long (cut to fit). There are other manufacturers that sell it as well.
    Gates 28095.PNG

    The original Chrysler part is black. All the aftermarket ones I’ve seen are silver. Both works fine.

    In your case, unless you drive the car often at or below freezing temperature, you might be able to not worry about that part.
    BudW
     
  18. Oldiron440

    Oldiron440 Well-Known Member

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  19. volare 77

    volare 77 Well-Known Member

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    When I was a kid, I ran all my 4bl holley carbs without a choke. A few extra pumps in real cold weather usually got me going just fine with a little more warm up time.
     
  20. Justwondering

    Justwondering Well-Known Member

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    Budw and OldIron --
    My A/C wasn't working in the Silverado this weekend... just made some noise like something was in the blower cage. Then I turned it off and it sounded like something was scrambling around in it.
    So....
    I turned that sucker and and let it run for about a 1/2 mile.
    Turned it off the 2nd time and no more noise.

    The picture is what I found today when I took it all apart to look.
    3691DA44-62B3-4651-B935-331506C5408F.jpeg
    A73B8EA7-F1CB-48E3-8D43-5B83938A1133.jpeg


    I'm in the market for a replacement resistor now as only 2 of the 5 speeds work
    and two new cabin filters.

    JW
     
    Last edited: Mar 18, 2019 at 9:39 PM
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