1972 Chevrolet Monte Carlo 5.7L Eng VIN H, Automatic Trans, Trans Mfr CD PowerglideFACTORY OEM SERVICE PROCEDURE

Vacuum Checking Relay

Identify all vacuum hoses and relay ports to ensure correct reassembly, disconnect two hoses from vacuum valve at the relay. Disconnect long vacuum hose from other side of relay and disconnect short vacuum hose (same side of relay) at vacuum motor port. When installing valve, connect all hoses in same order.

CAUTION: If long (white stripe) hose from checking relay to transducer is replaced, replacement hose must be at least 15" long. Transducer operation will he noisy if shorter hose used.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.