Vaccum pump q's - Dodge Diesel

BigDiesel396 · 05-19-2008, 01:25 PM

Ok, what all does the Vaccum pump do. I know on my old 6.5 chevy "diesel" the only thing it controlled was the wastegate and when the pump finally died I just threw it out, got a shorter belt, and put a manual wastegate arm on it, (which included $5 of parts, wingnut, metal for bracket, and spring...) I'm pretty sure I need to reuse the Chevy PS pump for the hydroboost to work right so I was thinking about taking the CTD PS and Vaccum pump off and mounting the Chevy PS pump off of there instead. So, lets hear it. Any questions, answers, suggestions, jokes, winning lottery numbers etc... I'd like to know it all...Thanks in advance

Cheers!

BigDiesel396 · 05-20-2008, 05:22 PM

bump messagetoshort

dieselman2300 · 05-20-2008, 06:18 PM

Well, it does your heating and a/c mixing doors and controls. It also controls the cruise control. Also has something to do with the trans. (I think). And it controls the 4x4 axle disconnect.

infidel · 05-20-2008, 06:20 PM

As far as the engine goes the vacuum pump does nothing.
On the Dodge part though it activates the cruise control, 4wd and climate controls.

BigDiesel396 · 05-22-2008, 06:14 PM

so since I'm not using cruise, 4wd is a little different on the Chevy and climate controls would probably be different as well on the chevy, the only thing I am keeping is the heater and coolant is always flowing through for that anyway isnt it? Its just a matter if you turn the blower on or not.

VinDiesel · 05-24-2008, 11:31 PM

The Chevy will most likely have a similar setup where there are flow controlling doors in the heater/AC unit. Though I'm not very familiar with the hydra-boost setup, I think it still has a vacuum assist on it too? Some Dodges had the hydra-boost. I think you'll find the Dodge PS pump will work for you and you don't have to remove anything from the engine.

kthiemann · 05-25-2008, 01:14 PM

The vacuum pump provides vacuum for the hvac system as well as the cad cut out, cruise control, the brake booster and on some early models the abs system. The hvac system uses vacuum to control the mode doors not the temp. so if you take away the vac. it will only blow thru the defrost vents. The vac. pump also drives the PS pump so if you decide to change to the chevy system you will need to find a block off plate for the vac. pump mount as well as figure out a way to mount the differant style pump and find a way to run a belt to it to drive the thing.

BigDiesel396 · 05-25-2008, 05:46 PM

well, I was thinking if I was going to take the Vac pump and Dodge PS pump off of the engine I was just going get the machinist at work to make a block and drive shaft for the Chevy PS pump and run the Chevy PS pump off the gear drive for the Vac pump...no new belt necessary.. All I want to run for the HVAC system is the defrost for the windshield anyway... my AC is the windows down...

Does anyone have a good idea of how the Chevy hyrdo-boost system works, theres 3 lines on the Chevy PS pump and all are going to/coming from the hydro-boost system. Also if it did have vacuum assist it wasnt doing anything in the Chevy because I took the Vac pump right off the old engine, the only thing it controlled was the wastegate

BigDiesel396 · 05-28-2008, 06:59 PM

Messagetooshort

05-20-2008, 06:18 PM	#3
dieselman2300 Registered User Join Date: Aug 2007 Location: Beautiful USA! Posts: 1,133 My Photo Gallery My Classified Ads	Well, it does your heating and a/c mixing doors and controls. It also controls the cruise control. Also has something to do with the trans. (I think). And it controls the 4x4 axle disconnect. __________________ A 12 valve with LOTS of fuel and a E.D. 62/68/14 with a S475 waiting in the garage. Its hard to soar like an Eagle, when you work with a bunch of Turkeys.

05-20-2008, 06:20 PM	#4
infidel Registered User Join Date: Dec 2003 Location: Montana Posts: 14,473 My Photo Gallery My Classified Ads	As far as the engine goes the vacuum pump does nothing. On the Dodge part though it activates the cruise control, 4wd and climate controls. __________________ Bill '95 2500 4x4 auto '95 3500 5 speed flatbed hauler stock for one day

05-24-2008, 11:31 PM	#6
VinDiesel Registered User Join Date: Aug 2002 Location: Enid, OK Posts: 385 My Photo Gallery My Classified Ads	The Chevy will most likely have a similar setup where there are flow controlling doors in the heater/AC unit. Though I'm not very familiar with the hydra-boost setup, I think it still has a vacuum assist on it too? Some Dodges had the hydra-boost. I think you'll find the Dodge PS pump will work for you and you don't have to remove anything from the engine. __________________ '96 Ram 3500 SLT, 2WD, XC, LWB, 3.54 Dana 80 posi, 47RE w/TransGo kit, Mopar Perf. +2qt pan, K & N filt., cat gone, FlowMaster, #4 plate +.040", 3K GSK, Pensacola "Stage 1" injectors, HX35W/40 hybrid, adj. boost ctrl., TST 60psi boost, VDO EGT, trans. temp. "New" (to me) '94 Ram 3500 custom crew cab CTD stock for now.

05-25-2008, 01:14 PM	#7
kthiemann Registered User Join Date: Dec 2007 Location: Lubbock TX. Posts: 397 My Photo Gallery My Classified Ads	The vacuum pump provides vacuum for the hvac system as well as the cad cut out, cruise control, the brake booster and on some early models the abs system. The hvac system uses vacuum to control the mode doors not the temp. so if you take away the vac. it will only blow thru the defrost vents. The vac. pump also drives the PS pump so if you decide to change to the chevy system you will need to find a block off plate for the vac. pump mount as well as figure out a way to mount the differant style pump and find a way to run a belt to it to drive the thing. __________________ "Poverty is the worst form of violence." Mohandas Gandhi Mine: 07.5 6.7 68RFE 2500 4X4 TRX4 bone stock for now 2000 Subaru Forester Da Bosses: 2012 Subaru Impreza

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05-20-2008, 05:22 PM	#2
BigDiesel396 Registered User Join Date: Feb 2007 Location: Prince Edward Island, Canada Posts: 90 My Photo Gallery My Classified Ads	bump messagetoshort

05-22-2008, 06:14 PM	#5
BigDiesel396 Registered User Join Date: Feb 2007 Location: Prince Edward Island, Canada Posts: 90 My Photo Gallery My Classified Ads	so since I'm not using cruise, 4wd is a little different on the Chevy and climate controls would probably be different as well on the chevy, the only thing I am keeping is the heater and coolant is always flowing through for that anyway isnt it? Its just a matter if you turn the blower on or not.

05-25-2008, 05:46 PM	#8
BigDiesel396 Registered User Join Date: Feb 2007 Location: Prince Edward Island, Canada Posts: 90 My Photo Gallery My Classified Ads	well, I was thinking if I was going to take the Vac pump and Dodge PS pump off of the engine I was just going get the machinist at work to make a block and drive shaft for the Chevy PS pump and run the Chevy PS pump off the gear drive for the Vac pump...no new belt necessary.. All I want to run for the HVAC system is the defrost for the windshield anyway... my AC is the windows down... Does anyone have a good idea of how the Chevy hyrdo-boost system works, theres 3 lines on the Chevy PS pump and all are going to/coming from the hydro-boost system. Also if it did have vacuum assist it wasnt doing anything in the Chevy because I took the Vac pump right off the old engine, the only thing it controlled was the wastegate

05-28-2008, 06:59 PM	#9
BigDiesel396 Registered User Join Date: Feb 2007 Location: Prince Edward Island, Canada Posts: 90 My Photo Gallery My Classified Ads	Messagetooshort