0
Heater control valve there isn't vacuum and there isn't any heat?
Wiki User
∙ 14y ago
My 2004 Ford Explorer there isn't any vacum from the present heater control valve and the blower has been replace and the themostat has been replace and there is a clicking behind the a/c unit
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What is the vacuum valve on the return side of the heater hose on a 69 Chevy 350 for?
That is called a heater control valve. When you are not using your heater, vaccume closes a small valve that's in the control valve and stopes the water from going through the heater core. Therefore you get no heat inside of the cab.
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
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
Where is the heater control valve on a 1998 ford expedition with a 4.6L engine?
Heat control is by air flow control doors in the a/c and heater box. There is no water valve.
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.
Toyota Sienna 2004 has no heat?
Have you checked you heater control valve or heater core if working properly.
No heat in 1996 Jeep Cherokee?
Check the vacuum operated valve at the hose going to the heater core.
Can a bad heater control valve limit the amount of heat in the cab?
Yes, it can.
Why on your Lincoln LS sometime blows out hot air when the air is on?
The heater control valve is bad. Sometimes the dual heater control valve will go and the AC will blow full heat.
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.
Why is heat always on in Chevy s-10?
possible bad heater control valve?
Where is the heater control valve located on a 1997 Dodge Caravan?
open hood and directly on firewall is black hose coming up and looping down. It is about 3/4 in inside diameter. there is a little plastic fitting in this hose which is a valve which is controlled by air vacuum. It controls the hot water being diverted from the engine to the heater. you can pull off the vacuum hose and see if it has vacuum and you can manually actuate the valve with your finger reach around the back of this item and stick your finger through the hole and slide the valve up...have someone turn the heat on and off engine not running but with the accessories switch on key switch on you should feel or hear the valve actuating. Actually, when the engine is not running, there is no vacuum. Engine must be running for the heater control valve to open and close if it is vacuum activated. Some heater control valves are operated by cables. These can open and close without cranking the engine.
