This check valve is located in-line just behind your carburetor. To test it simply place it in your lips and try blowing through the side with the single port. You should be able to breath in and not breath out. If this valve is bad you will find the headlights opening up after the engine has been shut off on your 1969 - 1970 Cougars and your tilt away function not working correctly on your 1967 - 1970 Cougars equipped with a tilt column. A good working vacuum system should be able to experience the headlights opening and closing without the motor running even days after the car has been parked. This unit is guaranteed to work when you receive it but due to the age we cannot guarantee how long it will function. We suggest you consider our reproduction of this valve which carries a lifetime warranty.
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