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No vacum to heater control - 1995 Lincoln Town Car

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Check for cracked vacuum lines in the system

Posted on Jan 19, 2013

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Vent control


Does your mustang have vacum or electric control. If vacum, pull out controll and check if all the vacum lines are connected. Or if there are any cracks in the line. Check both ends of the line, where it connects to the control and up to the heater box.

Jul 25, 2012 | 1992 Ford Mustang

1 Answer

The heater blower goes to the windshield instead of the floor


Check for broken vacum hose on and around engine on the control for the heater defrost and a/c might need to replace vacum switch

Aug 24, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

Will not blow heat through the vents. what operates the control is it a vacum sytems?


only blows top or bottom under the hood by the fire wall on pass side there is a vacume line is broken if not there is a controler on the heater box behind glove box that can go bad there is vacume and electric

Feb 14, 2011 | 1998 Ford Taurus

1 Answer

Blower work fine but still dont get no heat or defrosters could use some help thank you


It sounds like your heater controls are not working. They are usually operated by a vacume line. check under dash passenger side behind glove box for the vacume line disconected ps check engine side first its easier. if vacume line is good chech vacum at heater box their is a meatel vacume unit that opens and closes the heat and defrost doors. if your heat is only comeing out of the defrosters The doors under the dash are not opening and closeing. ChecK the metal vacume unit . A vacume pump can be purshed at parts store some have a loner program.

Nov 26, 2010 | Chevrolet Beretta Cars & Trucks

1 Answer

1997grand voyager is blowing cold air new thermostate water pump and the raditor and heater core has been back flushed it started blowing hot air again then went back to blowing cold air again


I would look for a vacum leak on the control valve for the heater. There are 2 lines from the radiator leading back to the firewall. One has a control valve on it that should be vacum controlled. When you back flushed to the heater core you may have forced this valve open temporarily. The control may have low vacum or insufficient vacum to open a stuck valve. The good news is you can actually manually open this valve and tie it in the open position which will at least temporarily solve the problem. Check your vacum lines for leaks and check the valve to make sure it isn't sticking.

Jan 21, 2010 | 1999 Plymouth Grand Voyager

1 Answer

When both heater controls are put on hot I get warm air on the passenger side and no heat on the drivers side.


Sounds like you are not getting enough hot water to the heater core. Check the heater control valve to make sure it is operating properly. If it has a vacume line disconnect it and make sure there is plenty of vacume. If not enough vacume find the leak and repair it. If it operates electrically make sure there is voltage if there is voltage then make sure the valve is opening all the way if not replace the valve. If the valve is opening all the way you may have an obstructed or plugged heater core.

Nov 25, 2009 | 2004 Chevrolet Impala

2 Answers

Fan is okay on heater but no warm air coming out.


It sounds like the valve may be stuck or broken that provides heat to the core. First check your water/fluid level in your radiator. If that is full then you want to look for a valve that is occassionally vacum operatedon one of the two lines, about 1" in diameter, that run from teh radiator core to the Firewall. normally these are on teh Passenger side. Look at this valve and see if it is vacum operated or manually operated by a cable. If it is cable operated make sure the cable is actually working, if it is vacum operated make sure you can open and close it by hand and that you have vacum on the line. If vacum is present and you can operate it by hand then the valve itself is faulty. Same if you can't operate it by hand. If there is no vacum you have a vacum problem and most likely need to trace teh vacum line back to it's source and or replace it. The Haynes repair manual for your vehicle will be able to assist you further and provide pictures and diagrams of teh system to follow.

Nov 15, 2009 | 2005 Pontiac Grand Prix

2 Answers

Heater in my 99 gmc 2500 is not working


They could be related but most likely not. There are two water lines which go back to the firewall from the radiator. On one of those lines is going to be a controller that is cable or vacum controlled. If it has a vacum line you need to check the vacum pressure at the connection using a vacum pump. You want to make sure that valve is opening and closing accordingly. If it isn't then your heater will not work because no water is getting to the core. In this case you will need to isolate the vacum leak back to the source of the problem. If there is a cable connections make sure the cable moves freely and in sync with the cab control. If not replace the cable. Assuming the radiator is full this valve is the next place to look for a fault.

Sep 23, 2009 | 1999 Chevrolet Silverado 1500

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

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