1994 Mazda RX 7 Troubleshooting Cooling System

1994 Mazda RX 7 Troubleshooting Cooling System

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On: 25 Jan, 2020

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The previous post we posted about the lubricant system and now discuss the cooling system in 1994 Mazda RX 7. Coolant served to cool the warm engine in our vehicle it means this function very important for our engine. What contains inside the pdf ...

The previous post we posted about the lubricant system and now discuss the cooling system in 1994 Mazda RX 7. Coolant served to cool the warm engine in our vehicle it means this function very important for our engine. What contains inside the pdf manual:

1. Engine Coolant 2. radiator cap 3. radiator and coolant fan 4. coolant fan relay 5. thermostat 6. water pump and water thermosensor for more detail you can download pdf at under page.

figure of cooling system mazda rx 7 1994

figure of cooling system mazda rx 7 1994

  1. Radiator cap
  2. Radiator
  3. Coolant fan motor
  4. Coolant fan relay
  5. Thermostat
  6. Water pump and water thermoswitch.

Engine Coolant

radiator cap tester

radiator cap tester

Before starting let’s prepare tools that necessary in feather inspection what you need are the adapter set, radiator cap tester this tool used for inspection of cooling system pressure. How to check the coolant level (engine cold) in Mazda RX 7 1994?

coolant level

coolant level

coolant leakgae

coolant leakgae

  1. Verify that the coolant level is near the filler neck
  2. Verify that the coolant level on the dipstick is between the F and L
  3. Add coolant is necessary.

Note the distance between the L and F marks on the dipstick represents 1.0 Liter {1.1 US qt, 0.9 lmp qt}.

Coolant quality

Warning: removing the radiator cap or the coolant filler cap while the engine is running, or when the engine and radiator are hot is dangerous. Scalding coolant and steam may shoot out and cause serious injury. It may also damage the engine and wait until it is cool. Even then, be very careful when removing the cap. Wrap a thick cloth around it and slowly turn it counter-clockwise to the first stop,. Step back when the pressure escapes

When you are sure all the pressure is gone, press down on the cap still using a cloth-turn it, and remove it.

  1. Verify that there is no buildup of rust or scale around the radiator cap or filler neck
  2. Verify that coolant is free of oil. Replace the coolant if necessary.

Coolant leakage

  1. Connect a radiator tester (you can buy this on the closest local store) and the SST to the radiator filler neck.

Caution: applying more than 142 kPa {1,45 kgf/cm2,20.6 psi} can damage the hoses, fittings, and other components and cause leaks.

  1. Apply 142 kPa {1.45 kgf/cm2,20.6 psi} of pressure to the system
  2. Verify that the pressure is held
  3. If not as specified, check for coolant leakage.

How to maintain coolant?

coolant preotection

coolant preotection

coolant draining

coolant draining

Caution: the engine has aluminum parts that can be damaged by alcohol or methanol antifreeze. Do not use alcohol or methanol in the cooling system. Use only ethylene-glycol-based coolant.

Caution: use only soft (demineralized) water in the coolant mixture. Water that contains minerals will cut down on the coolant’s effectiveness.

  1. Measure the coolant temperature and the specific gravity with a thermometer and a hydrometer.
  2. Determine the coolant protection by referring to the graph shown
  3. If the coolant protection is not proper, add water or coolant.

Anti-freeze solution mixture percentage

antifreeze solution mixture persentage

antifreeze solution mixture persentage

Replacement

How to drain coolant water?

Warning: removing the radiator cap of the coolant filler cap while the engine is running, or when the engine and radiator are hot is dangerous. Scalding coolant and steam may shoot out and cause serious injury. It may also damage the engine and wait until it is cool. Even then, be very careful when removing the cap. Wrap a thick cloth around it and slowly turn it counter-clockwise to the first stop. Step back when the pressure escape.

When you are sure all the pressure is gone, press down on the cap-still using a cloth-turn it, and remove it.

  1. Remove the radiator cap
  2. Loosen the radiator drain plug
  3. Drain the coolant into the container
  4. Flush the cooling system with water until all traces of color are gone.
  5. Let the system drain completely.
  6. Install and tighten the drain plug.

How to refill water coolant?

Use the proper amount and mixture of ethylene-glycol based coolant. (Refer to coolant protection, page E-5 )

  1. Slowly pour the coolant into radiator up to the coolant filler neck

Filling pace:

  • L {1.1 US qt, 0.9 lmp qt}/min. max

Coolant capacity:

                8.8 L {9,3 US qt, 7.7 lmp qt}/min. max

  1. Fill the coolant reservoir up to the F mark.
  2. Securely install the radiator cap and the coolant filler cap.
  3. Start the engine and let it idle about 10 minutes until it warm-up
  4. If the coolant level warning light comes on while warming up, turn the engine off and inspect the drain plug and water hoses for leaks.
  5. Stop the engine and allow it cool.

Warning: removing the radiator cap or the coolant filler cap while the engine is running, and when the engine and radiator are hot is dangerous. Scalding coolant and steam may shoot out and cause serious injury. It may also damage the engine and cooling system.

Turn off the engine and wait until it is cool. Even then, be very careful when removing the cap. Wrap a thick cloth around it and slowly turn it counterclockwise to the first stop. Step back when the pressure escapes.

When you are sure all the pressure is gone, press down on the cap-still using a cloth-turn it, and remove it.

  1. Check the coolant level. If it’s low, repeat the procedure from step 1.
  2. Fill the reservoir to the F mark

There is another inspection for coolant system but we don’t write them all to get more complete guidance you able to download the manual below:

94e_cooling_system.pdf

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