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06-27-2016, 11:07 PM | #1 |
Registered User
Join Date: May 2013
Location: Mississippi
Posts: 501
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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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1987 R20 Suburban LQ4/4L80e swap: http://67-72chevytrucks.com/vboard/s...d.php?t=693824 |
06-28-2016, 03:48 AM | #2 |
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Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,238
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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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David fuller Ase Certified Mechanic 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 |
06-28-2016, 03:50 AM | #3 |
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Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,238
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Re: Vacuum pump for AC control?
Here u go
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David fuller Ase Certified Mechanic 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 |
06-28-2016, 08:58 AM | #4 |
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Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: Vacuum pump for AC control?
That is where I hooked up mine for the 78, works fine!
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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