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Old 06-27-2016, 11:07 PM   #1
Nodnarb76
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Vacuum pump for AC control?

I'm done with my LQ4/4L80 swap on my 87 Suburban, and when I went to tee into my brake booster vacuum line the vent control worked fine but, I lost my power brakes! When I took the tee out, the brakes worked fine again. This tells me for some reason the brake booster lost enough vacuum to not work properly with it tapped into. I'm wondering if I have a vacuum leak between the tee and the other end of the vacuum hose. With a vacuum on the line AC controls work fine. Could I get a small 12v vacuum pump and hook it to the AC control vacuum line?
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Old 06-28-2016, 03:48 AM   #2
truckdude239
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Re: Vacuum pump for AC control?

There is a nipple on fhe right side of the i take you can break off where gm used for vacumn for the climate co trol systems on vans and some trucks
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1971 Chevy c-10 under going a 4.8l LSx swap

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Old 06-28-2016, 03:50 AM   #3
truckdude239
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Re: Vacuum pump for AC control?

Here u go
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David fuller
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Click here to help support our board!!


1971 Chevy c-10 under going a 4.8l LSx swap

Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305

2007 Honda Accord my daily 145kmiles
2002 Honda Accord 4 door With 330k(sisters car)
2005 toyota Avalon 228k( brothers car)
2002 Sububran 5.3 245k
2000 Tahoe 5.3l 378

General manager for Marco's Carwash & lube
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Old 06-28-2016, 08:58 AM   #4
solidaxel
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Re: Vacuum pump for AC control?

Quote:
Originally Posted by truckdude239 View Post
There is a nipple on fhe right side of the i take you can break off where gm used for vacumn for the climate co trol systems on vans and some trucks
That is where I hooked up mine for the 78, works fine!
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