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Heater control vaccum hoses - 1995 Chevrolet Monte Carlo

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  • Chevrolet Master
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The vaccum hose for the heater control valve comes out of the inside of the cor from the firewall.

Posted on Oct 06, 2009

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1 Answer

My heater or a.c doesnt come on at all..what could it be


Did you check all the fuses? This may have vaccum operated control system, check all vaccum hose connections at the engine manifold and even the little tubes under the dash board going to the controls. The heater core might be plugged, feel the hoses going to that, both should get hot. Check wire connection on the AC pump clutch.

Feb 18, 2015 | 1997 Ford Expedition

1 Answer

I am getting very little heat from the heater. Changed the thermostat and flushed the heater core and topped of coolant. Is there a quick fix for the door or do I have to remove the dash


the doors are vaccum controled check the vaccum hoses that go into firewall first, then you might just have to pull some off the dash blend door may be broke or vacum hose broke. are the heater hoses hot?

Feb 04, 2011 | 2001 Ford Taurus

1 Answer

I have problem heating the back seat section, the blowers are ok, but only cold air comes out. Please help!


Check and see if some one has bypassed heater core hoses. If they have theirs a goo bet the heater core leaked and needs replacement befor new hoses can be installed. Depending on year there is a valve in heater core line that tells hot water to flow it maybe stuck or no signal to valve is being recieved. If its operated by a vaccume hose make sure its not broken. This may require you access the heater control panel in dash make sure vaccume is being recieved and that hose to heater valve holds vaccume. If vehicle is a later model then control panel maybe electronic and electrical diagrams necessary to futher diag.

Jan 10, 2011 | Pontiac Montana Cars & Trucks

1 Answer

No heat changed thermostat and just pulled the heater core which seems fine water from kitchen faucet flows thru both ways but cant find any control valve in the heater hoses to see if it is working


firs check both heater hoses are hot to the heater core after it is warmed up. If they are hot the heat cool door is not moving make sure the linkage for the actuator door is hooked up. If that isnt working test the module that moves it.If it is manually or vaccum operated there will be a heater valve inline the heater core hose. Make sure your vaccumm is supplied to the heater box from the engine. If it is staying on defrost you may be missing vaccum supply to the heater control. If it is electronically controlled the door actuator module is bad or not getting power. Sometimes the heater hand controls are the problem. sometimes the dash control separates and gives a vaccum leak.

Dec 11, 2010 | 1991 Oldsmobile Cutlass Calais

1 Answer

Where do i locate the heater control valve


Under the hood on the hose going to the heater core. It will have a cable (manual control) or a hose (vaccum control) going to it. It's an easy replacement if you choose to do it yourself.

Nov 24, 2010 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Heater fan blows on windshield no matter what it is set for. Blows only cold air no heat?


sounds like a vaccum leak. the heater control doors inside the heater box are vaccum controled and a small crack in a vaccum hose under the hood will stop them from working.

Feb 05, 2010 | 1995 Buick LeSabre

1 Answer

Heater problems it sounds like a flap opening in the heater only opens sometime or heater does not work. how can i repair this????


ON THE PASSENGER SIDE UNDER THE HOOD LOOK UP CLOSE TO THE FIREWALL,&ALMOST ON TOP OF THE BLOWER MOTOR YOU WILL SEE A VALVE THAT HEATER HOSES RUN TO AND IT HAS A VACCUM HOSE HOOKED TO IT TOO, CRANK THE TRUCK,& TURN THE HEAT ON,THEN GO AND PULL THE VACCUM HOSE OFF & IF THE LITTLE ARM DOESN'T MOVE ,HOOK THE HOSE BACK UP & SEE IF IT MOVES IF NOT THAT IS THE HEATER CONTROL VALVE & ITS BAD ,YOU CAN PUSH THE VALVE TO MAKE IT HEAT ,BUT IN SOME CASES,YOI HAVE TO PRY THE ROD TO THE VACCUM PLUNGER OFF AND TAKE A ZIP TIE AND TIE IT IN THE OPPPISITE FROM THE WAY IT WAS.I HAD THE SAME PROB ON MY 98 MOUNTIANEER,IN SUMMER I WOULD ZIP TIE IT ONE WAY & WINTER THE OTHER TILL I GOT AROUND TO FIXING IT

Dec 05, 2009 | 1998 Ford Explorer

1 Answer

COLD AIR ALL THE TIME CHANGED THERMOSTAT / NO PRESSURE MOTOR DOES NOT RUN HOT ALSO COULD THIS BE HEATER CONTROL VALUVE WHERE IS IT LOCATED


could be heater control valve if it has one it should be in the heater hose or check all the vaccum lines there could be one off or broke not allowing vaccum to the actuator to move the blend door to heat

Oct 21, 2009 | 1988 Ford Ranger

4 Answers

WHEN I CUT THE HEAT ON ITS BLOWIN COLD AIR


uh oh... you better hope its not in your heater core!! hoping its in thermostat.
I hate dash removal :(

Aug 28, 2009 | 2003 Ford Crown Victoria

1 Answer

My 1995 ford areostar van when heat is on only blows cold air


The aerostar has a vacuum operated watervalve in the heater tubing.the valve is located on the
passenger side inner fender behind the aircleaner.with someone operating the controls inside the van
you can check to see if you get vaccum by removing the tiny hose that goes to the water valve
and checking for suction as you in the van person operates the heater conthttp://www.fixya.com/PostAnswer.aspx?thid=1323651&prdid=696348rols. If you have no
vaccum there is a break in the hose between the intake manifold and the valve. If you do get
vaccum check to see if the valve changes position from vaccum on to vaccum off. you can see
this motion on the small lever on the side of the valve. If the valve lever doesn't move you can
move it manually to allow the water to flow through the heater core. if the valve won't move manually
there is an obstruction in the valve. If it does move manually the vaccum diaphragm is gone.
replace the valve. if it moves to the manual open position you can hold it open with a tywrap.
before you get to this point you should first check to see that there is enough coolant in the
radiator. If you still have no heat you can check the coolant flow through the heater core. to do
this remove both heater hoses from the valve and pump water from a hose into one of the hoses
water should flow from the other hose. If it doesn't the heater core is blocked. The rear heater
operates the same way with the watervalve under the van just behind the drivers seat.
Good luck.

Dec 02, 2008 | 1995 Ford Aerostar

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