- Hey there, recently my peugot 508 (2011 year) started having problems blowing cold AC air, it’s just blowing hot air. I went through scottys videos and checked if the end of the compressor spins freely, which it does so it‘s not stuck. Coolant was changed a year ago. When clicking on Max AC it won‘t couple the end of the compressor cluch, so it still spins freely with the pulley attached to the rotor. Button is lighting up so its working. It seems to me that the relay is broken but searching through the web i cannot find the location of that relay. I really dont want to change the compressor is there anything further to check?
Compressor looks like this with same yellow connector, how can i chack it at home using some cables and battery connection (which ccable to positive or negative to test it)
Enough refrigerant may have leaked out that the low pressure cutoff switch is preventing the compressor from engaging in order to prevent damage. Don't just blindly change the compressor. It's not likely at fault if it's not seized up or noisy, the problem needs to be properly diagnosed.
Ok that sounds like a possibility. I will have to find a shop to do the work and find leaks using UV light. The car only has 87k miles but is there a way i can check if there is too low refrigerant by myself? So i can be sure it‘s not electronics related. I also watched the video the imperator posted down there but i cannot find that single wire to check if the clutch reacts to voltage. It‘s sort of a multy pin connector on mine. Still thanks for your responses guys.
You would need to hook up a manifold gauge set to the system to check refrigerant pressure. The low pressure cutoff is usually between 15-20 psi, so if your static pressure is that low the compressor will not engage. (Pressure will be the same on high and low sides when the system is off.)
Unfortunately if you have a variable displacement compressor, which is likely, you cannot judge the refrigerant charge level by the pressures developed with the compressor running. (However you would be able to tell if the compressor is working.)
Not sure what the multi-pin connector is for on your compressor. There might be a ground wire or maybe a sensor or a control valve in the compressor itself. Maybe you can trace one of the wires on the connector to the compressor clutch coil for test purposes.
UV dye can be good for finding leaks but it won't help in areas that you cannot see, in most cars that would be the evaporator and expansion valve. An electronic detector would be the best way to check for those leaks. You can also examine hoses and connectors for evidence of oil that would accompany a leak. Some will spray soapy water around and look for bubbles as you would with a leaky tire.
Hey there so after going to the mechanics they üumped in new refrigerant and said that there was almost nothing in anymore. Unfortunately the ac still does not blow any cold air. Any suggestions?
What else did the mechanic do? Check for leaks? Check operating pressures? Did it work at all after recharging?