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Heater valve vacum hose where does it go to for vacum

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To a vaccum resovior under the hood, that in turn gets vacuum of the engine intake manifold.

Posted on Feb 05, 2010

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There is a vacume valve in the lines going to my heater core that is leaking can u tell me what it is called or if i can eliminate it


Hello, if you eliminate the valve you will get constant hot water flowing through your heater causing heat inside the cabin, even when it is switched off, this is if you join the 2 hoses together without the valve. You can even block these hoses but than you will have no heater at all. I cannot remember the correct name but as you call it, heater vacuum valve or bypass tap, with a bit of description should get you the part.

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No heat 1998 ford explorer change the doorblend actuator still no heat


Hello prieto725
Check the vacum supply to the heater control valve, under the hood on the right side in line with the
input heater hose. Have a helper move the temperature control on the dash while you watch to see
if the control valve is working properly. Also check the heater hoses they should be the same temp.
check the input hose between the ctrl. valve and firewall, if the input is hot and the output is not,
the heater core may be pluged. Hope this helps.

Dec 09, 2010 | 1998 Ford Explorer

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We live in a cold climate. Our 1998 GMC Jimmy Heater will not provide cabin heat. The engine warms normally. We replaced the thermostat just to make sure the coolant was warm enough. The blower operates...


UNHOOK BOTH HEATER HOSES AND FLUSH OUT HEATER CORE
DO IT FOWARD AND BACK FLUSH / COVER DIST. CAP OR YOU WILL
FILL IT WITH WATER / IF IT CLEARS OUT HOOK HOSES BACK UP AND
BLEED AIR OUT OF SYSTEM / IF IT DOES'T CLEAR OUT HEATER CORE
WILL NEED TO BE REPLACED (DASH COMES OUT TO DO HEATER CORE)

Dec 08, 2010 | 1998 GMC Jimmy

1 Answer

1998 GMC K1500 Sierra X-Cab Z71, Concerning the A/C - Heater. The fan blows good just doesn't open the heater core valve to let the heat in, it stays cold,How can I fix it ?


the heater sustem is run off of a vacum from the engine, there are actuators that open and close the "valves" pull the vacume lines off one at a time( the coloured hoses) and find out if you have either no vacum or an actuator un hinged from the "valve" door.
this should narrow it down for you message me back and we can work it out.

Dec 06, 2009 | 1998 GMC Sierra

1 Answer

I have no heat when I turn on my heater blower on a 99 silverado 1500


Two things come to mind one the flap on the inside of the air duct is not switching over to allow heat to come through. Second your heater core could have a blockage. Go under the hood find both heater hoses run your truck till it reaches normal operating temp then feel both heater hoses one at a time. If one feels very hot and the other feels cold or even luke warm you have a blockage.If they both feel hot then look into the duct works under the dash. There should be a valve that switches the door between your heater duct and your ac duct that may not be operating properly. Some valves are vacume actuated so look for a broken vacume line.

Dec 01, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

I have a 1998 e350 cargo van and the heater won't get hot. replaced the hot/cold button. cant find where the heater control valve goes. or if that is the problem. what should i try?


Check the heater hoses going into the heater core.Both of the hoses should be hot to touch,when the engine is at normal warm running conditions.If only one,or none of the two hoses are not hot,or very warm.then pull the heater hoses off,and use a water hose to flush the heater core out.Make sure the coolant level is full,if it is not,then the heater core will not get coolant flow threw it.

Oct 28, 2009 | Ford E-350 Cars & Trucks

1 Answer

My heater only blows cold air i changed the heater core still no heat the car warms up fast like its suppose to and never runs above 200 my air conditioner keeps coming on and shuting off im puling all my...


you may have a bad control valve or the vacum liner to the valve is broke, it will be inline in the heater core hoses and havd the vacum to the top of it. most newer ones are made out of plastic. if they do not open you will not get heat

Oct 27, 2009 | Oldsmobile Bravada Cars & Trucks

1 Answer

2002 Land Rover ~ Freelander - No heat coming from the heater


Look for two water lines about 1 in in diameter running back toward the condensor unit in the firewall. On one of those lines will be a control. It is sometimes vacum controlled. When they are vacum conrolled they have a tendency to get stuck or you may have lost vacum to the unit. You can use a vacum tester and short piece of hose to test this to see if you have lost vacum or if it is stuck closed. Connect the test hose to the control on teh hose and apply vacum to the unit. If the valve opens you will get heat in the vehicle. If it does not open then it is stuck in the closed position and will need to be replaced in most cases.

Sep 10, 2009 | 2002 Land Rover Freelander

1 Answer

1997 S10 Blazer heater will not work (I live in Minnesota)


Water flows from pump to intake, check vacume hoses very good.

Jan 01, 2009 | 1997 Chevrolet Blazer

1 Answer

Luke warm heat


YES, THEIR IS A HOT WATER CONTROL VALVE, ITCAN BE OPERATED BY VACUMN, OR CABLE, VAC, TYPE WILL HAVE AVACUMN HOSE TO IT, PLS CHECK IT FOR CONDITION, CRACKS, SWELLING, IF OK, THEN WITH ENGINE RUNNING, HEATER CONTROL IN HOT POS. PULL HOSE OFF VALVE, PUT FINGER OVER END, FEEL FOR VACUME. IF THERE IS, MOST COMONLEY RESULT IS THAT VALVE NEED TO BE REPLACED.

Oct 01, 2008 | 1999 Jeep Cherokee

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