1981 Mazda B2000 BaseFACTORY OEM SERVICE PROCEDURE

No. 2 Valve (All Models)

Drain radiator until coolant level is below inlet manifold. Remove hoses from thermo valve and remove valve from inlet manifold. Connect hoses to valve and place valve in container of water with thermometer. Gradually heat water and note temperature at which air will not pass through valve. See Fig 1. If air passes through valve before temperature shown in Thermo Valve/Switch Specifications table, replace No. 2 water thermo valve.

Fig 1: Testing No. 2 Water Thermo Valve
G09313931Courtesy of MAZDA MOTORS CORP.
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.