To the left of the Transmission Fluid stick. It on a little "T" valve.
on top of the manifold. you access it by removing the dog house
What year is your dodge ram? i have a 1997 4x4, 318, and it has two vacuum check valves going to the heater controls. the first check valve is on the right side of the intake maifold, just below the hose going to the pcv valve on the right side valve cover. if you follow that hose to the right side of the firewall, there is a tee in the vacuum lines, if you follow the line that goes into the cab, that line has another check valve. i found that the one at the intake manifold was the valve that failed on me. good luck
In the line that hooks to the passenger side of the intake manifold.
Low vacuum, an external leak, or a leaking vaccum check valve are the only causes.Low vacuum, an external leak, or a leaking vaccum check valve are the only causes.
between firewall and engine, between a rubber hose that leads to the valve cover and a short 90 degree hose to a vacuum nipple.
Check for a vacuum leak Could be the check valve at the power brake booster
The PCV (Positive Crankcase Ventilation) valve on a 2006 Dodge Ram with a 4.7-liter engine is located on the valve cover. Specifically, it is found on the driver's side, near the rear of the engine. To access it, you may need to remove some components for better visibility and reach. Be sure to check for any vacuum hoses connected to the PCV valve during replacement.
There is a 1 way vacuum check valve in the eng compartment it is either disconnected or the valve is bad. comes of of the brake booster,thin vacuum line that goes into the vehical
In a 2007 E-350 Van, the vacuum check valve is typically located in the vacuum line that connects the intake manifold to the brake booster. It is usually positioned near the brake booster or along the vacuum hose leading to it. This valve helps maintain vacuum pressure for the brake system by preventing backflow. Always consult the vehicle’s service manual for precise location and diagrams.
Vacuum check valves are usually located close to the vacuum source.
Remove hose and attach a vacuum gauge
you have a vacume leak probbly going to the heater control There is a check valve that prevents the loss of vacuum to the heater controls. This check valve goes bad. Then, as you accelerate, the vac. in your engine drops and along with it, the vac to the heater controls drops (is less). To fix this, locate the check valve and replace it. Follow the vacuum line from your firewall (where it goes through the fire wall) back to the check valve. This check valve may be located between the engine and a vacuum reserve tank. The heater controls may be using the vacuum from the reserve tank. In any case, find the little check valve in the vacuum lines and replace it. You will see a remarkable change in the heater controls. I hope I explained this well enough. See you Later, Check your intake gasket if it is leaking at all it will cause it.