Citroen C5 x7 2009 A/C not working

[Crystyan]

Bonjour ! Je rencontre ce problème depuis un mois. Il y a un mois, j'ai ajouté 525 g de fréon, mais malgré cela, la climatisation ne fonctionne toujours pas ! Le compresseur ne se met pas en marche ! Au niveau du connecteur du compresseur, je ne mesure que 3,7 V ! Le testeur indique pourtant que le compresseur fonctionne ! J'ai remplacé les modules suivants : BSI, ECU, BSM, Climatronic et ventilateur, mais le compresseur ne démarre toujours pas ! Voici les mesures que j'ai relevées sur le testeur : 1- Demande d'activation du compresseur de climatisation : inactive (voir détails) : le calculateur de climatisation demande l'enclenchement du compresseur frigorifique suite à une demande de l'utilisateur 2- Demande d'activation de la climatisation par l'utilisateur : active (voir détails) : l'utilisateur demande la mise en marche du système de climatisation via les commandes du panneau de climatisation 3- Commande du compresseur frigorifique : inactive (voir détails) : le BSM pilote l'enclenchement du compresseur de climatisation (ou le BSI le pilote sur les véhicules dépourvus de BSM) ; ce paramètre ne peut passer à l'état « actif » que lorsque le moteur tourne 4- Commande de sortie d'autorisation du compresseur : inactive (voir détails) : le BSM intervient dans cette commande d'activation de la climatisation selon l'équipement du véhicule 5- Information d'autorisation du compresseur : active (voir détails) : information d'autorisation de mise en marche du compresseur de climatisation fournie par le calculateur 6- Entrée du capteur de température d'évaporateur de climatisation : 27 °C ATTENTION : ce paramètre n'est fonctionnel que pour les systèmes de climatisation sans régulation de température Température mesurée par la sonde d'évaporateur située dans le bloc de climatisation ; la sonde d'évaporateur est reliée directement au BSI (Boîtier de Servitude Intelligent) Valeurs typiques : Compresseur de climatisation enclenché : la température baisse progressivement pour atteindre une valeur comprise entre 0 et 5 °C (pour une température ambiante d'environ 20 °C) Compresseur de climatisation arrêté depuis 15 minutes : la température mesurée est proche de la température de l'habitacle Voici les relevés de paramètres standard que j'ai obtenus , Le pressostat fonctionne correctement (8 bars moteur arrêté et 9 bars moteur allumé)... aucun code d'erreur n'est affiché ! Je me demande ce que cela pourrait être ? J'ai vérifié tout le système électrique, et il est en parfait état ! Il n'y a aucun problème du côté électrique ! Auriez-vous une idée ? Merci beaucoup !

[myglaren]

Although this may be a "French Car Forum", it is not a French forum, but a British one. Very few of our members speak French.

You can use an online free translator to turn your text into English, Google Translate or as below, DeepL

Hello! I've been having this problem for a month. A month ago, I added 525 g of Freon, but even so, the air conditioner still isn't working! The compressor won’t start! At the compressor connector, I’m only getting a reading of 3.7 V! Yet the tester indicates that the compressor is working! I’ve replaced the following modules: BSI, ECU, BSM, Climatronic, and the fan, but the compressor still won’t start! Here are the readings I recorded on the tester: 1- Air conditioning compressor activation request: inactive (see details): the air conditioning control module requests that the refrigeration compressor be activated in response to a user request 2- User request to activate the air conditioning: active (see details): the user requests that the air conditioning system be turned on via the controls on the air conditioning panel 3- Refrigeration compressor control: inactive (see details): the BSM controls the activation of the air conditioning compressor (or the BSI controls it on vehicles without a BSM); this parameter can only be set to “active” when the engine is running 4- Compressor enable output control: inactive (see details): the BSM is involved in this air conditioning activation control depending on the vehicle’s equipment 5- Compressor enable information: active (see details): information authorising the start-up of the air conditioning compressor

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[Crystyan]

Okay! Forget the translation! Hello! I’ve been dealing with this problem for a month. A month ago, I added 525g of Freon, but the air conditioning still isn't working! The compressor won't start! I'm only measuring 3.7V at the compressor connector! Yet, the diagnostic tool indicates that the compressor is functional! I’ve replaced the following modules—BSI, ECU, BSM, Climatronic unit, and fan—but the compressor still won't start! Here are the readings I obtained from the diagnostic tool: 1- A/C compressor activation request: inactive (see details): the A/C control unit is requesting compressor engagement following a user request 2- User A/C activation request: active (see details): the user is requesting to turn on the A/C system via the climate control panel 3- Refrigerant compressor command: inactive (see details): the BSM controls compressor engagement (or the BSI controls it on vehicles without a BSM); this parameter only switches to "active" when the engine is running 4- Compressor authorization output command: inactive (see details): the BSM is involved in this A/C activation command depending on vehicle equipment 5- Compressor authorization status: active (see details): authorization signal to start the A/C compressor provided by the control unit 6- A/C evaporator temperature sensor input: 27°C NOTE: this parameter is only functional for A/C systems without temperature regulation; temperature measured by the evaporator probe located in the HVAC unit; The evaporator sensor is connected directly to the BSI (Intelligent Service Unit). Typical values: With the A/C compressor engaged, the temperature drops gradually to between 0 and 5°C (at an ambient temperature of around 20°C). With the A/C compressor off for 15 minutes, the measured temperature is close to the cabin temperature. Here are the standard parameter readings I obtained: the pressure switch is working correctly (8 bar with the engine off, 9 bar with the engine running)... and no error codes are displayed! I wonder what it could be? I checked the entire electrical system, and it is in perfect condition! There are no electrical issues! Do you have any ideas? Thanks a lot!

[windy1603]

9 Bar running is too high, does the compressor start for a few seconds then drop out something in the range of 3-4 is a more normal running pressure based on the various peugeot's I have worked on. Was the system empty and vacuumed when you filled it.

[Crystyan]

The system previously had 200g of freon, and I checked to make sure it wasn't leaking anywhere, and it wasn't, and I added 525g of freon Type r134a

[Crystyan]

But I mean, with the engine off it's 8-9 bar, and with the engine on, it's 10-11 bar. Today, I idled the engine for a while longer (around 20-30 min.), and it went up to 12 bar! But still the compressor does not engage! The compressor connector only receives 3.7V (the same goes for the variable cylinder connector behind the compressor)...The electrician told me that there would be a condition, but, I don't know what that condition would be! Without any DTC, the entire electrical installation is very good, it doesn't have a single broken wire, it doesn't have a single short circuit ! I really have no idea what it is!