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What does the heater valve do?
The heater control valve is used to shut off hot coolant from entering the core when the heater is in the off position. A heater control valve can be actuated by either a vacuum line or a cable from the vacuum heater control valve to the heater core. This hose should be warm; if not the heater control valve is stuck and needs to be replaced
Where is the heater control valve on a 1999 dodge durango?
There is no heater control valve on this generation of dodges like there used to be... the water flows constantly through the heater valve.. the only control is a trap door that allows cab air to be run through the heater core and is controlled by a vacuum solenoid in the heater box.. the temp control is also vacuum operated but be sure to check the vacuum supply line coming in from the engine.... it has a check valve in it that can be keeping the controls from getting enough vacuum to operate properly.. if you don't have a mighty vac just get one of those packs of barbed vacuum fittings from your local shucks and bypass the valve temporarily and see if you get heat... hope this helps
Why does a EGR valve stop working?
EGR valves are usually activated by a vacuum line from a thermal sensor. It could be leaks in the vacuum lines, a failure of the sensor, or a failure of the valve itself. Since the valve is exposed to the heat of the exhaust system, it is prone to jamming from carbon buildup and destruction of the vacuum diaphragm from heat.
Why on your 79 Chevy pickup does the heat only blow down on the floor?
You have lost engine vacuum to the control head. Look under the hood back near the distributor and there should be a vacuum check valve. it is most likely broken or the vacuum line is loose or broken.
What can cause heat not to work when you turn the climate control button to the heat?
It all depend if it is vacuum operated or electrical. If it is vacuum check the vacuum line attached to the intake manifold, it might have come loose. If its electrical check the heater control panel.
1996 Jeep Cherokee heater control valve vacuum line where does it connect once it goes through the fire wall?
the vacuum hose connects to the airbox
Why does your 2000 Saab 9 5 have no heat?
Most cases it is the heater control valve located on the back firewall, the vacuum line going to it or if the heat only blows on one side it is the temperature control box or the connecting arm that goes to the heater control flap. These models are notorious for the $24.00 part breaking.
Why does your car give off heat when you accelerate?
You may need a check valve in the vacuum supply line feeding the HVAC system or you have a vacuum leak in the HVAC system.
Where can you get a vacuum diagram for the rear heater control valve for 97 astro van?
vacume line to the valve has broke off from manifold vac that goes to the switch
Where is a heater control Valve located on a 2001 ford expedition?
Antifreeze/CoolantCooling FanPressure CapCoolant ReservoirHeater CoreHeater Control ValveEngine HeaterHVAC Hoses & ValvesHVACThermostat Description: A heater control valve may be located in one of the heater hoses to regulate coolant flow to the heater core. The valve is usually vacuum-controlled, which is operated by controls on the dash. Purpose: The valve is used help control heater output. Maintenance Tips/Suggestions:Insufficient heat, or heat that can�t be turned off may indicate a problem with the heater control valve. Inspect the valve to make sure that its vacuum line is properly connected. If the valve has an external linkage arm, operate the heater controls and watch to see if the valve changes position. If you have any doubts about the valve�s operation, have the heating system checked by a qualified service professional. http://www.carcare.org/Cooling_System/control_valve.shtml
How do the hoses go on a heater control valveon a 1991 jeep Cherokee?
There are two hoses that come from the thermostat at the top end of the engine at the front of the car. These two hoses go back to the firewall. Just above where they enter into the firewall there is a vacuum switch. It has two small hoses feeding it. One of the hoses gets its vacuum from the intake manifold and the other gets eventually fed to the heat control valve. The heat control valve is located on the opposite side of the firewall. You will notice that when the engine warms up the top hose is much hotter than the bottom hose. Upon start up the bottom hose might be moderately warm because a small amount of warm coolant will flow through it. After the engine is warm this coolant flow will stop because the heat control valve is closed even though you have the heat at maximum. Simply unplugging the electrical connection to the vacuum switch will open the heat control valve and you should have heat inside your vehicle again. You can also bypass the vacuum switch by unplugging both vacuum hoses and getting a piece of hose to connect them together. This will give you more heat. Ultimately the vacuum switch needs replacing. Also note that flushing your radiator core is easy to do. You should be able to connect a garden hose to the top hose and flush out the core. The heat control valve does not prevent this when the engine is off. Ultimately, you are asking this question because when you turn on the heat in your Jeep it blows cold air. You might find the heat control valve but realize that it really isn't the problem. It is the vacuum line controlling this valve that is the problem and the vacuum switch connected to it. The grand cherokees never had the water valve.
What would cause transmission fluid to be found in the vacuum line connected to the heater control?
on some cars there is a automatic transmission modulator valve that tell by vacuum when to shift gears. If that valve goes bad you will get tranny fluid in your lines.
