Purge Megane Refrigeration System 1.9 dt year 99

Hi!
I'd like to know if someone can help me and explain how to bleed the cooling system. I've tried several times and haven't been able to do it correctly.

The first thing I do is remove the expansion tank cap and the thermostat housing screw. I fill the expansion tank with antifreeze until it squirts out of the thermostat housing hole. Then I replace the thermostat housing screw and fill the expansion tank to the maximum level. I close the cap and leave the car running for a while until the thermostat opens several times. The biggest problem is that sometimes there's no coolant in the expansion tank, and other times it's completely full. What am I doing wrong? Or what's the solution?
Thanks in advance and best regards.

For that type of bleeding, just like with Peugeot, Volkswagen, Corsa, and all the others, I don't overthink it. The best way is to bleed it when it's cold. Fill the reservoir to the correct level and blow into the system several times, applying pressure, until the level in the reservoir stops dropping. Then start the engine, without putting the cap on, and let it run until the fan cycles three times. Then turn it off and check the level. Of course, let it cool down for a few seconds, then stop, check the level, and top it up if necessary. Problem solved.

Thanks for the help, I'm going to try it that way and see if it works because it's driving me crazy.

Dear Carlos, when I have to bleed the cooling system of a Megane, I always do it with the engine cold. I bleed it through the thermostat housing plug until no more air comes out. Then I fill the expansion tank to the upper fill line, put the cap on, and tighten it well. But first, I check that the cap is in good condition and doesn't have any scale or rust buildup that could prevent the valve from functioning properly, since that valve regulates the pressure in the cooling system. As the name of the tank suggests, it's an expansion tank where the water level fluctuates according to the operating pressure. Before the thermostat opens, the water or coolant level tends to rise because the pressure increases to 1 bar or 1 kg. Then, when it opens, the level drops. The exact check is done with the engine cold. I hope this helps. Until next time, Dario

Hello: I'm having problems with my 1999 Renault Megane 1.9 dTi. Yesterday, I disassembled the cooling system to clean it, including the radiator, and removed all the connectors. I reassembled it, refilled it with coolant, and it ran perfectly. The next day, when I went to start it, I found the cooling fan running all night, the odometer light on, and the air conditioning compressor clutch engaged (all this without the ignition on). Can you give me any guidance on what the problem might be?

kikemec wrote: For that type of bleeding, just like with Peugeot, Volkswagen, Corsa, and all the others, I don't overthink it. The best way is to bleed it when it's cold. Fill the reservoir to the level and blow into it several times, applying pressure to the system, until the level in the reservoir stops dropping. Then start the engine, without putting the cap on, and let it run until the fan cycles three times. Then stop the engine and check the level. Of course, let it cool down for a few seconds, then stop, check the level, and top it up if necessary. Problem solved.