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Actuator not getting vacuum - Cars & Trucks

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It could be a vacuum leak .How dose the vehicle run .
Vacuum leaks make the vehicle run not so good .You could connect a vacuum gauge to the intake manifold and test this .
But the actuator it self is likely the problem .Any time you have vacuum and pressure you tend to get condinsation water makes these thing stick the vacuum isn't enough to free it
Look at the actuator first

Posted on Apr 02, 2015

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Look for a leaking vacuum hose or one tat is no longer connected to the engine intake manifold.

Posted on Apr 02, 2015

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1 Answer

I would like to find were the actuator , how do you fix a actuator that will not open when the a/c unit is running this on a 1994 Ford Thunderbird lx 4.6 v8 engine


Your A/C actuator is vacuum controlled, I would look for a leak in the supply line that comes from the engine into the cabin. If the line is good and you have good vacuum getting to the controller, make sure the controller is switching vacuum to your different actuator pods. If everything is working correctly at the controller, make sure the vacuum is getting to the actuator pod. If it is, then your actuator is bad.

Jul 27, 2014 | Cars & Trucks

1 Answer

I have a 97 blazer 4wd i repalced vaccum switch all vaccum lines and made sure actuator cable was good lights come on like im in 4wd but diff doesnt lock in and actuator not getting vaccum


The vacuum actuator should move by hand without vacuum applied. You should also be able to see it move if you have someone switch the transfer case into 4hi/lo from 2wd and then back again. There is a vacuum switch on top of the transfer case that locks vacuum once the encoder motor engages the transfer case to lock the front axle into position, and then releases the vacuum once the encoder switches back into 2wd mode allowing the front axle to decouple. If you aren't getting vacuum, first check your vacuum lines for leaks, then check for vacuum coming from the transfer case when it's in 2wd mode.

May 07, 2014 | 1997 Chevrolet Blazer

1 Answer

Audi 1.8t over boost


problem could either be wastegate not getting vacuum.make sure wastegate actuator getting vacuum if no find fix vacuum hose leaks if wastegate getting vacuum either wastegate actuator binding stuck or you have restricted exhaust system.

Sep 21, 2013 | 2000 Audi A4

1 Answer

1999 jimmy what would cause the 4x4 actuator not to get vacuum and where does the vacuum to come from


Vacuum has to come from the motor

It goes to a vacuum sw on the transfer
shifter,then to the right front drive axle
vacuum actuator

Mar 19, 2013 | Cars & Trucks

1 Answer

I have a 1992 blazer and the 4 wheel drive doesnt work, what are some thing s that would make this happen? but my transfer case is funtioning. because the front drive shaft will spin but the axel isnt...


most common problem we see with the s-10 is there is a vacuum actuator under the battery box this is what engages the front definitional there is a vacuum switch in the top of the transfer case when you move the shifter into 4wd there is a lever inside the transfer case that pushes on the tor on the bottom of the vacuum switch witch allow es vacuum to flow to the front engage actuator under the battery box. so with all this said, check to make sure their is no vacuum leak form the back of the intake manifold to the switch and from the switch to the actuator, if their is no vacuum leak , and when the shifter is in 4wd and their is vacuum to the actuator then replace the actuator or cable if no vacuum to actuator then replace the switch on top of the transfer case.

best guess is you have a vacuum leak to the switch, the vacuum hoses run close to the exhaust manifold and if they come out of there bracket they will touch the manifold and get burned into.

Mar 24, 2011 | 1992 Chevrolet S-10 Blazer

1 Answer

No vacuum at the actuator under battery


There would have to be a disconnected or damaged vacuum hose between the actuator and the vacuum source. There are several places where vacuum lines have small plastic connectors or plastic t fittings. Those are good candidates for disconnects or breakage. Also check the vacuum hoses at the rear of the engine. They tend to be affected more by heat and contaminants. I've seen them get real soft and mushy or gummy and would collapse when the engine was started, causing a restrictions in the vacuum signal. Have you actually taken the battery and battery tray out of the truck to inspect the vacuum line and actuator? That particular line is prone to becoming rigid and unable to maintain the connection with the actuator. The connection requires the vacuum hose to be bent almost 180deg to hook up to the back of the actuator. It requires the flexibility of a new hose.

Jan 10, 2011 | 2002 Chevrolet S-10

1 Answer

4wd not working replaced actuator when i press button it sounds like its engaging but it isnt actuator is tight so seems like vacuum works but actuator doesnt compress diaphram have vacuum switch on...


Sure sounds like the vacuum switch is not working properly. You have done exactly what I would have done, start with the actuator(most common problem) and go from there. If your not getting the vacuum , then most likely the vacuum switch is your problem.

Please take a moment to rate my answer......... thanks

Nov 30, 2010 | 1997 GMC Sonoma

1 Answer

No4x4


I own a 98 short box S10 4X4 with a Vortec 4.3 and a posi rearend. I have had to check all these areas of the 4wd system. Could be one of the following or a combo of more than one __1. the fuses 2. the actuator (under the battery tray) 3. the cable from the actuator to the front differential 4. the transfer case control module (behind passenger side kick panel) 5. the vacuum switch (on top of the transfer case) 6. the push button on the dash.7. cracked or dry rotted vacuum lines in the system. Any of these not working properly will prevent you from getting your truck into 4wd. My issue ended up being the cable and the actuator. I had a vacuum issue which would not let the actuator pull the cable to engage the front axles.Replaced the vacuum lines and the vacuum switch and still no 4wd.Turned out to be the actuator and the actuator cable. Fixed that and now I have 4wd any time I want. If you hear a clicking sound at the transfer case,its fine. If you hear another click at the TCCM, its fine. If all your lights work on the dash switch, its fine. If your actuator doesn't leak any air, its fine. I replaced the vacuum switch for $15 at advanced auto parts. Turned out I didn't need it. I don't drive my truck unless there is a lot of snow so I just locked the front differential until I get a new actuator $30 and actuator cable $30. This was how I fixed my problem and I hope this info can help others,

Dec 31, 2009 | 2002 Chevrolet S-10

1 Answer

No 4 hi


Hi: 4 High and 4 Low button should be flashing, If no 4 low either problem will be in the vacuum actuator located below the battery tray. 9 out of 10 times the actuator is not getting vacuum. Battery acid at some time dripped down on the actuator or vacuum lines and created a vacuum leak.

Dec 18, 2008 | 2005 Chevrolet Blazer

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