Vacuum Bypass Closes Heater Valve
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CARQUEST Vacuum Bypass Closes Heater Valve

Part No. 74856 Warranty Details  

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Please note: Advance Auto Parts is proud to carry comparable exact-fit parts from multiple vendors, as such, the item you receive may be one of two quality brands. Both brands meet the same fitment requirements and are equal in their performance and specifications.

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Factory Air.

Product Features:
  • Temperature tested to 270 degrees F
  • Pressure tested to ensure leak free design
  • Vacuum controlled
  • Application specific design
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Hose #1 Size:.625 in
Hose #2 Size:.625 in
Type:Vacuum Bypass


by PowerReviews
CARQUEST or Factory AirVacuum Bypass Closes Heater Valve

(based on 1 review)

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Reviewed by 1 customer

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(1 of 1 customers found this review helpful)


Fixed my heating problem.


from East Canton, Ohio

Verified Buyer


  • Solved rear heating


  • Difficult To Install

Best Uses

  • Everyday Driving

Comments about CARQUEST or Factory Air Vacuum Bypass Closes Heater Valve:

This valve allows hot water to go to the rear heater core. It was difficult to install, but worth the effort.

  • Car & Truck:
  • Auto Enthusiast, Mechanic

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