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I have a 2003 l200 4life. The expansion tank keeps filling up with the radiator emptying. I have replaced the radiator cap etc and the problem persists. I have also had it pressure tested and all seems fine. At the moment i have to syphen the expansion tank every 100-200 miles and put back into radiator.

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  • stuartj Aug 28, 2008

    The garage specifically tested the head gasket also (sorry!) they added some fluid to check this and all was ok.

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You could have a head gasket leaking putting to much pressure in to the radiator.

Posted on Aug 28, 2008

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I have a Honda Civic 2003. Car has been running fine except the Radiator expansion tank keeps filling up and overflowing, the car tempt got up to 3/4 once and I noticed radiator is emptying. No leaks,...


The radiator cap can be pressure tested but it may be easier to just replace it. This car is showing the symptoms of a blown head gasket so you should have it tested using an exhaust analyzer over the radiator.

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Cant find the valve to let air pressure from my radiator for my water to flow right


FILL COOLANT SYSTEM UP BY POURING COOLANT IN THE EXPANSION TANK UNTIL COOLANT LEVEL STOP DROPPING IN THE EXPANSION.WHEN YOU POUR COOLANT IN EXPANSION TANK AIR BLEED OFF THROUGH THE SMALL COOLANT LINES GOING TO EXPANSION TANK.WITH PRESSURE CAP OFF RADIATOR COOLANT LEVEL IN EXPANSION IS AT FULL COLD MARK.WHAT YOU TO DO CRANK ENGINE UP LET IDLE WARM UP UNTIL COOLANT DROPS IN EXPANSION TANK KEEP ADDING COOLANT UNTIL STOP DROPPING STAY AT FULL COLD MARK.WHEN COOLANT LEVEL START RISING IN EXPANSION TANK.PUT PRESSURE CAP BACK ON RADIATOR.WHILE ENGINE IDLING WATCH TEMPERATURE GAUGE.IF START CLIMBING TURN OFF ENGINE LET IT SIT FOR LITTLE WHILE TAKE A LARGE RAG OPEN RADIATOR PRESSURE CAP A LITTLE AT A TIME TO KEEP FROM GETTING SCALDING TO RELEASE AIR IN COOLANT SYSTEM.WHEN PRESSURE IS RELEASED OPEN PRESSURE CAP ADD MORE COOLANT IN THE EXPANSION TANK.CRANK ENGINE AGAIN LET IDLE WHEN TEMPERATURE GAUGE START CLIMBING. TURN OFF ENGINE WAIT FOR WHILE BEFORE OPEN RADIATOR PRESSURE CAP.WHEN YOUR THERMOSTAT OPENS WHEN TOP RADIATOR HOSE IS HOT AND ENGINE COOLANT TEMPERATURE GAUGE STOP CLIMBING AND COOLANT LEVEL STOP DROPPING IN THE EXPANSION TANK.ALL AIR IS EXPELLED FROM COOLANT SYSTEM TO KEEP ENGINE FROM OVERHEATING.

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Just need to know where to put the coolant


If you don't have a radiator cap or a cap in the upper radiator hose, you have to add through the Overflow. Cavaliers are this way. It takes forever to burp the air out of them. Be careful that you don't stop before all of the air is out. An aid pocket in the cyl head will damage your engine.

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How do I change the coolant


Hi!!
On the bottom of the radiator, there is a drain valve, just open it and drain fluid into a container, if you want faster drain, remove bottom radiator hose.
NOTE: DO NOT OPEN SYSTEM WHEN HOT, COOLANT IS POISONOUS FOR PETS, KEEP IT AWAY FROM THEM.
Good Luck!! Rate this post!!

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I changed our my rediator and now the sensor light saying radiator coolant is low and the buzzer won't stop going off. The radiator coolant level is fine and my temp gauge is fine. Any help would be...


Do you have an overflow tank that has low level in it?
LEVEL CHECK The coolant level should be checked regularly. Serious engine damage can occur if the engine overheats. CAUTION
Check the coolant level when the engine is cold; serious injury could result from escaping steam or hot fluid if checked when hot. If your car is equipped with an electric cooling fan, make sure that the ignition switch is OFF. The cooling fan will automatically operate if the ignition switch is on and the engine coolant temperature is high, or if the wiring connector on the thermostat housing is disconnected.
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    The radiator is not factory-equipped with a safety cap. Do not remove the radiator cap before removing the expansion tank cap, or when the engine is hot. Fig. 1: Remove insects and debris from the radiator fins 85811096.gif

  2. Remove the expansion tank cap. The expansion tank should be 1⁄3 full, unless Full and Low marks are provided. The level should be well above the bottom of the tank when the engine is cold.
  3. If it is not, carefully remove the cap from the radiator. The radiator should be full.
  4. Add a 50/50 solution of ethylene glycol (or other suitable coolant) and clean water. If there was no coolant in the expansion tank, fill the radiator until the level is near the inlet port and install the radiator cap. Then, fill the expansion tank to the specified level, and secure the expansion tank cap. When checking the coolant level, the pressure cap should be examined for signs of age or deterioration. Check it for a worn or cracked gasket. If the cap doesn't seal properly, fluid will be lost and the engine will overheat. A worn cap should be replaced with a new one. The fan belt and other drive belts should be inspected and adjusted to the proper tension. (Please refer to the belt inspection and adjusting procedures, earlier in this section.) Remove the radiator cap and run the tip of your finger around the inside of the filler neck. Check for excessive deposits of rust or scale around the filler neck lip and the filler port. Make sure the coolant is free of oil. Replace the coolant as necessary. Hose clamps should be tightened, and soft or cracked hoses replaced. Damp spots, or accumulations of rust or dye near hoses, the water pump or other areas indicate possible leakage, which must be corrected before filling the system with fresh coolant. Periodically clean any debris, leaves, paper, insects, etc. from the radiator fins. Pick the large pieces off by hand. The smaller pieces can be washed away with water pressure from a hose. Carefully straighten any bent radiator fins with a pair of needle nose pliers. Be careful as the fins are very soft. Don't wiggle the fins back and forth too much. Straighten them once and try not to move them again.
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Jul 05, 2010 | 1985 Mazda RX-7

1 Answer

How do i put coolant in a polo 1.4 year 2000


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start the engine with the radiator cap off. keep topping the radiator up as the air comes through the system and the level goes down. keep it FULL. top up the expansion tank if necessary back to the full mark, do not fill it to the top you will only get coolant all over your engine bay!
gently rev the engine for 20 seconds just to send the water round and get some air out of the system. top up both radiator and tank again if required. refit the radiator cap and expansion tank cap. go for short drive. check the levels again (be careful with the radiator cap since the coolant will be hot now!) - should be settled now.

ready for the road!

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Is there a cap on the radiator to fill with antifreeze? I would like to add some leak repair and want to put it directly into the radiator, not the expansion tank.


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This is called the expansion tank

On the side of the expansion tank is a level mark which shows how much water goes in there

If that is totally empty go back to the pressure cap on the radiator and unscrew it anti -clockwise (Only when the engine is cold and is not running).

Fill that up with cold water (Do you need anti-freeze in the water in your part of the world?)

Once that has been topped up replace the pressure cap making sure it is turned until it locks firmly then go back and fill up the expansion tank

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