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Old 09-27-2020, 11:46 AM   #1
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Anyone replaced one of these vacuum pumps? Anything tips I should know. Mine is maki

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Mine is making a lot of noise.
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Old 09-27-2020, 11:51 AM   #2
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...ooops--not a pump--its an actuator valve for a blending door--but nope--never replaced one....are you sure it is getting vacuum from pump and 12v [if appropriate] from the HVAC control head in the dash? Some heads control valves by just turning vacuum on or off--via the thin blue hose
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Old 09-27-2020, 11:54 AM   #3
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...ooops--not a pump--its an actuator valve for a blending door--but nope--never replaced one....are you sure it is getting vacuum from pump and 12v from the HVAC control head in the dash?


I think it is getting vacuum. When I change air vent position, it vibrates for quite a while before it finally stops.
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Old 09-27-2020, 11:59 AM   #4
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….sounds like maybe the valve might be working--perhaps the blending door is stuck open/closed?
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Old 09-27-2020, 12:13 PM   #5
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Test it by pushing a hose on it and sucking on the hose. It should move and hold with your tongue on the end of the hose.

Could buy a vacuum test pump.
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Old 09-27-2020, 12:22 PM   #6
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….sounds like maybe the valve might be working--perhaps the blending door is stuck open/closed?


How do I check the blending door? Where is it? 2012 Ellipse
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Old 09-27-2020, 12:32 PM   #7
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That looks like the actuator that controls the recirculate vs fresh air door for the max AC setting on your AC control. You can trace the blue line back and check for collapsed areas on the hose especially near passage through the fire wall. Could be vacuum is being restricted. I have seen more collapsed hoses than bad actuators.
A brake bleeder kit is a great tool for testing vacuum related problems. $20 to $30 and works good for bleeding brakes also.
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Old 09-27-2020, 12:43 PM   #8
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How do I check the blending door? Where is it? 2012 Ellipse
The door is attached to the actuator in your picture. Look in through the openings at the bottom of the housing.
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Old 09-27-2020, 01:36 PM   #9
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The door is attached to the actuator in your picture. Look in through the openings at the bottom of the housing.


So I guess if I cut that zip tie at the top of the actuator, it should drop down from the blender box. Right? Thanks
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Old 09-27-2020, 03:18 PM   #10
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I’m GUESSING that zip tie is there to hold up the black hose running behind the actuator. I doubt the actuator is being held up by the tie.
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Old 09-27-2020, 03:25 PM   #11
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I’m GUESSING that zip tie is there to hold up the black hose running behind the actuator. I doubt the actuator is being held up by the tie.


Thanks Ed, so what holds up the actuator? Sorry for all these dumb questions.
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Old 09-27-2020, 03:30 PM   #12
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It looks like the zip tie is securing the black hose to the actuator. The actuator probably has a couple of threaded studs like the one in the picture. Also in the picture is the actuator rod that attached to the blend door and moves in and out.
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Old 09-27-2020, 03:36 PM   #13
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The blend air doors are in your picture. The rectangular openings are on either side of the actuator facing down about 30-45 degrees from vertical. They have some black material, either black foam or felt fabric.
The doors only move about an inch or so when actuated.
Run the a/c in outside air (fresh air) position and look at the doors. They should be open about an inch or so. Now, move the switch to normal a/c and door should stay in the open position. Then, place the selector in the recirculate (max cool) position. The doors should close.
Pull the blue hose off of the nipple on the silver actuator, the doors should open. That allows outside air into the cabin.
Replace hose.
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Old 09-27-2020, 03:40 PM   #14
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Follow the blue hose from the actuator to the vacuum pump. Inspect it for cracks or anything that will not allow a vacuum to form. The pump should be within about 2-3' from the actuator.
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