Function: 1 It can turn on the vacuum close flap and door lock to increase the idle speed. 3. Mainly used in automotive air conditioning systems. 4 The vacuum switching valve increases the throttle opening of the carburetor through the lever. 5. For FIESTA V (JH_, JD_) ST150 1999 110 4 Hatchback 2005ck, the part number of the item. Matching information is for reference only. 2. If you are not sure about the item, please contact us before purchasing to avoid unnecessary returns. Thank you!