Introduction
The model presented in the tutorial is a 306 1.8 16v phase 3.
Following the breakage of the hose which goes from the engine/thermostat housing to the heating radiator, I am replacing it.
I did not drain the circuit since all the liquid escaped while driving through the leak.
If you want to know how to drain the circuit, refer to the tutorial on replacing the water temperature sensor.
On my model it takes 5.5 liters of coolant. You will not need any specific tool, just a container to collect the used liquid and a plastic bottle (1.5L or 2L) which will be used when filling.
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The hose is a double hose. It is impossible to change only one.
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HS hose
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The leak came from there
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Fixing collars
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Remove the hose clamps and place them higher on the hoses.
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Then remove the 2 hoses by pulling on them.
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Since the hose was HS I decided to cut the 2 before taking out the rest.
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The hose "housing" is forced into the bore, the O-ring providing the seal. To ensure the hold, the housing is fitted with a clip.
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Screwdriver
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Place the screwdriver behind the staple to remove it from the shoulder
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then by placing it on the brake hose, lever it to remove the housing.
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Do not damage the brake hose!
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You have to put your screwdriver there.
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The case started to come out.
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Old hose
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Hose clamps to keep.
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In addition to the length of the hoses, the location of the bleeder plugs is also different.
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I don't know what this part supplied with the new hose is for, I didn't reuse it.
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Check that the new gaskets are properly in place.
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Then place the housing in place until the clip "clicks".
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We can immediately see the problem posed by the length of the new hose.
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If we leave it like that and put it in its place, it will pinch and prevent the water from circulating.
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So I cut a metal water hose that I had left to make a connection.
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I also cut the old hose.
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Old cut hose
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Connection
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Place the old hose on the thermostat housing and secure it with a hose clamp then connect with the new hose.
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Hose location
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Hose
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Other hose other problem. The angle at the end of the hose prevents it from fitting, so it must be cut.
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Once cut, put it in place and secure it with a cable tie.
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Remove the bleeder plug on the new housing you just installed.
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Turn the bleeder plug located on the cooling radiator next to the air inlet a quarter turn.
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Using a 5mm Allen key, remove the bleed screw located on the thermostat housing.
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Don't lose the little seal that's on top.
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Fill the expansion tank then place a bottle inside.
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Make sure that once the bottle is in the tank there are no leaks.
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Place your basin under the bleeders.
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As soon as liquid flows continuously over a bleeder, close it.
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To prevent the new hose from moving too much when I drive the car, I placed it in a sort of double plastic collar that I attached to the hook to hang the engine from a workshop crane.
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Since the new hose is located higher than the max level of the reservoir, you must fill the bottle until the fluid level is higher. You should see air bubbles escaping through the bottle.
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Bottle level
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Highest circuit level
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Since the expansion tank will be full and fluid will drain out of the overflow under the right front fog light, remember to place the drain pan there against the wheel.
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Start the engine to let the last air bubbles escape and to open the thermostat. The level will drop, top up gradually until there are no more air bubbles.
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To speed up the air purge you can apply a few strokes of the accelerator.
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Remove the bottle and close with the cap.
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Let the temperature rise until the fan starts. Wait for the fan to stop and then wait for the engine to cool. When the engine is cold, check the level and top up or remove the excess.
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Cancel: I did not complete this guide.
2 other people completed this guide.
8 Comments
Hello, nice tutorial, well explained, thank you, it helped me a lot to change the two hoses on my convertible
Good morning,
I have a micro leak at the elbow of this upper hose (306 HDi phase 3), towards what appears to be a seal. If there is a seal, is it sold separately or do I have to buy the complete hose?
indeed, I took this reference ^^ 6464QX Thank you
Hello, I think my brother (it's his car) bought this one STC - T408610.
Hello Stephane,
If it leaks inside there is very little chance that it comes from the hoses under the hood. In general it actually comes from the heater core which is faulty and yes you have to remove the dashboard. I have not changed the heater core on the 306 but having already tried to remove the dashboard I can tell you that it is a real pain.
Good luck