At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Some problems are beyond fixya. You need a good auto air conditioning shop. Noisy when cabin air conditioning is
turned could be warning of compressor failure, that could leave you stranded. Get it checked out.
I passed this question the first time I read it, so I will take a stab at it now. The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch. I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ? Speeding up the engine would increase voltage from the alternator. This is assuming the serpentine belt is tight and everything else is working correctly. I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.
no you hve to change your car compressor! because your car compressor is not working properly! or your compressor coil may be short! vote me if it is helpful for you
have you tried charging the ac system? most ac compressors have a pressure switch that will not allow the relay to engage the clutch if the coolant pressure is low. $15 can of r134a and maybe a $20 Haynes manual is well worth the price difference, eh?
Please check if the auto clutch solenoid works to engage the compressor whent he swittch is depressed. If not check the relay to the AC switch.
Now if the ac works but does not cool, check the thermostat or the pressure switch. If this is faulty the AC may not cool properly.
Finally check the belt tension on the compressor.If this has excessive slack , remove and tighten.
Locate wires coming from compressor clutch and trace to nearest plug that you can unplug. Turn on A/C to max cooling. If clutch not engaged (center of compressor drive pulley not spinning with pulley), unplug compressor clutch wires and use multimeter to check voltage going to compressor clutch. If voltage is around 12 volts or more, then clutch should be engaged when plugged in. Plug clutch wires back in (with motor still running and ac set to max). If clutch still not engaged, then clutch definitely bad because 12V signal should engage it.
I would check the following possibilities: 1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.
2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.
Could be other issues, but I would start with these.
Does your compressor cycle on and of. It should cycle every five minutes or so. You should see the clutch engaging or at least here it when it does. If not you have one of two problems. A bad compressor(bad clutch, ceased compressor piston, ((or bad cycling switch))) or your system has a leak. Now ac system have a bad habit of just being fickle. The leak could have fformed anywear in the system. Most common places are the shrader valves in the high and low side service ports. these ports are usually located on the alluminium lines or near the compressor. leaks will also commonly form as a result of old and dry o-rings. I would suggest finding your high side port and test bleed it. Do this in an open and well ventilated area. cover your nose and mouth with a wet rag and avoid breathing in any freon that may be expelled from the system. if no white mist comes out then the system is dry or at low pressuer. You can buy a leak detection kit from your local parts store. I hope this info is helpful.
×