Question about Dodge Ram 1500

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My 96 dodge ram 4x4 has a vacuum leak somewhere the air blows from the vents until i accelorate then it shifts to the winshield defroster vents once i let off the gas it switches back to the vents at chest level is there a vacuum system diagrahm for these vehicles ? or what can i check could it be the diaphram that controls the heat and air

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There are two small black vacuum lines near the A/C accumulator. These Tee into a single line that goes to the intake plenum. If you install a vacuum check valve in the one that comes from the intake it will solve your problems. Just did it and fixed mine that was doing the exact same thing......Good Luck

Posted on Aug 14, 2010

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THERE IS A SMALL BLACK VACUUM LINE THAT RUNS THROUGH THE FIREWALL INTO THE CAB WHICH CONTROLS YOUR DOORS. SOUNDS LIKE THE LINE MAY HAVE A CRACK AND WHEN THE MOTOR IS SHIFTING FROM ACCELERATION IT MAY BE OPENING AND CLOSING. IT USUALLY RUNS RIGHT BY THE EVAPORATOR LINS FROM INTAKE MANIFOLD INTO THE DASHBOARD. THAT SHOULD BE CHECED FISRT AND FOREMOST

Posted on Aug 07, 2010

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I assume there is a manual vent select switch.Does the air blow out the selected position?Why do you say it's a vacuum leak? I beleive(from what you discribe) the vacuum switch is malfunctioning.There should be a flapper that directs air to the vents or to the windshield.It seems this is no longer being controlled by the vacuum select.You need to purchase a manual for your vehicle.

Posted on Aug 07, 2010

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1 Answer

I have a 1995 dodge ram 1500 4x4 with a 5.2 l automatic. There is vacuum line sticking up behind the the engine with a vacuum brake hooked to it. where does that go


Not certain... just a thought... I believe Dodge uses vacuum solenoids to switch air flow from floor to vents and to defrost. Perhaps your loose line is from that solenoid. My '93 would go from defrost to floor when climbing a hill because of loss of vacuum. I hope this helps steer you to a solution.

Mar 23, 2014 | 1996 Dodge Ram 1500 Club Cab

1 Answer

Air shifts from vents to winshield


Sounds like you may have a vacuum leak.

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1998 dodge Ram 1500 4X4. The heater/AC blows out of defrost vents only, I am told this most likely a vacuum line, If this is true where is the vacuum line located.


In the engine compartment, locate black vacuum hose that runs from brake booster check valve to intake manifold, there will be a small vacuum hose attached to check valve at the power brake booster check valve. This is the vacuum line going to the heater control unit,check the hose all the way to the firewall, repair any leaks you find. And that should take care of your problem.......GOOD LUCK

Dec 03, 2010 | 1998 Dodge Ram 1500 4WD

1 Answer

2005 dodge caravan not blowing hot air while moveing but will get warm sitting idle and the defrost does not blow hot at all.


sounds like you need a thermostat, that should take care of the no heat, the defrost is controlled by engine vacuum sounds like you have a vacuum leak under the hood somewhere all i can tell you is to look around the passenger side of the intake manifold for a small ( a little smaller then a pencil ) blk vacuum hose if you do'nt find a leak suspect the vent control switch.....GOOD LUCK

Dec 01, 2010 | 2005 Dodge Caravan

1 Answer

Why won't my air go thru my vents or floor when I turn the dial to that location.It stays on the defrost mode.I have a 1998 Dodge Ram 1500,2 wlheel drv.The switch is a vacuum switch.


You probably have a vacuum leak somewhere. Chrysler default is defrost. My daughters Grand Cherokee had the same issue and was broken line near firewall. Also check to see if vacuum resevoir is not cracked. Trace the lines back to the intake and look for any broken hoses, fittings, etc. You could also try and spray a ight mist of WD-40 along the lines while the motor is running and the rpms should increase when the mist hits the leaking area. Good luck.

Aug 08, 2010 | 1998 Dodge Ram

1 Answer

No heat to cab in 96 dodge ram, will defrost.


you might have a vacuum leak, ck the vacuum line to the firewall where the a/c lines are at and make sure a check valve is in it also.

Dec 18, 2009 | 1996 Dodge Ram

2 Answers

Air vents are stuck in the floor and defroster mode in my 96 Blazer. Air will blow cold and hot, just can't change where it blows. Please advise


The HVAC door actuators are powered by vacuum, and the default position is the defrost/floor. Check for a disconnected or broken vacuum line somewhere near the passenger rear of the intake manifold. You should be able to find a line coming out of the firewall in the same area and follow it to the intake. Good luck

Nov 05, 2009 | 1996 Chevrolet Blazer

2 Answers

Ac will not blow thru ac vents, only thru defrost vents.


if vent doors are operated by vacuum check for loose or broken vacuum hoses in the engine compartment , or check the fuse box for any ac/heat fuses if it is a electricaly controoled system

May 04, 2009 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

Air only blow out of my defrost vents and sometimes the floor but not out of the dash vents. it still blows cold air though. how do i fix this


It sounds like you might have a vacuum leak or the switch is bad. Going to the dealer isn`t as bad as it used to be. I spent 5 days trying to change the front u-joint for the 4x4.I took it to the Dodge dealer and they did it in 2 hours.Was much cheaper than expected. Besides,they`ll know more about what it could be than anyone else. Just better in the long run.

Aug 03, 2008 | 2004 Dodge Ram 3500 Truck

2 Answers

1886 Dodge Ram 1500 Club Cab V8 (318) Vaccum Leak


I experienced almost the exact same thing in a customer's 1997 Dodge Caravan this week except on this one,the A/C would be blowing cold out of the vents,directly at you,and when you put the accellerator down pretty hard,the vents would cease to blow,but you could hear the defroster door flap,and the defrosters blew cold air.Let off the gas pedal,it switches back the way it originally was.Wasn't the customer's complaint,but it did make me wonder.

Jul 12, 2008 | 1997 Dodge Ram 1500 Club Cab

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