How to Replace a Mazda 6 Thermostat


The Mazda 6 model has either a four-cylinder or a V6 engine. The four-cylinder (2.3L) does not contain a serviceable thermostat where a thermostat is an element of a larger cooling assembly. It requires to be replaced at the dealership only. Whereas on the other hand V6 engine (3.0L) have a serviceable thermostat. Here we will discuss how to replace a Mazda 6 thermostat. This procedure is applicable for 2003 to 2008 Mazda 6 models having V6 engine.

Things you’ll need:

You will absolutely need the following tools to do your task:

  • Pliers
  • Screwdriver
  • Replacement thermostat
  • Replacement gasket
  • Drain pan
  • Socket wrench (8mm)

Mazda Thermostat

Step 1:

First of all begin with detaching the negative battery cable and removing the plastic engine cover.

Step 2:

Next take the cooling reservoir cap out (not the radiator cap) in order to advance the engine coolant flow. Now remove the engine brush guard which you will find beneath the front part of your engine bay and this removal will let you enable to access the radiator drain plug.

Step 3:

Put a drain pan or else a suitable container under the radiator drain plug. Next remove the drain plug to allow the coolant exhaust. Once the coolant is completely exhausted or draining, cover the container and put it to one side in a secure place.

Step 4:

Make loose the clamps from the engine air box hose as well as unplug the MAF (mass-air flow) sensor. Now take the air box hose out.

Step 5:

To get to the thermostat housing you first have to cut off the upper radiator hose. Also remove the three bolts from the thermostat housing. After that make use of a pair of pliers to loosen the clamp and then move the lower hose out of the way.

Step 6:

Take the old thermostat and gasket out. A gasket cannot be reused and hence required replacement.

Step 7:

Put the new thermostat as well as gasket with the jiggle valve in the “up” position and afterward replace the housing and the upper and lower radiator hoses.

Step 8:

Put in the air intake assembly again and tighten the clamps. Attach the MAF sensor once again. Put the radiator drain plug back and then reconnect the negative battery cable.

Mazda Thermostat

Step 9:

Turn the radiator cap with it wrapped in a towel. Wait for some seconds to release pressure ahead of removing it.

Step 10:

Refill the engine coolant and put the radiator cap back. Turn the engine on and keep an eye on the operating temperature. Don’t forget to look over the hoses for leaks or other damage.

Tips & Warnings:

  • If you find your engine coolant grimy or unhygienic, replace it with a new coolant as soon as possible.
  • Avoid applying this process in case if you are unfamiliar with vehicle engines as it may probably be harmful for you if you are inexpert.

Further Readings:

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