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Ac compressor draining battery

One day my ac started blowing hot air and the next morning my car would not start. i replaced that battery and a mechanic has informed me that the clutch on my ac compressor is draining my battery. he told me it would be 525 just to buy the part because the compressor must be purchased in order to get the clutch. any advice on the matter?


ps. my knob that controls the temp of air became hard to turn and eventually fell off. I see that others had the same problem. as well as my gas door does not open either! i just ask strangers at the gas station to hold the lever while i use a key to pry the door open. ha!

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  • car moron May 06, 2009

    SAME THING! I noticed my temp knob stuck a little bit THE DAY I purchased my 03 Lancer OZ. I mentioned it to the saleswoman while I was sitting in the car with her and she said it was like that because it was new and it would loosen up after a little while. (I'm a car moron so I believed her) It did not get better. I recently replaced my alternator and battery (6 mos ago) and now within the last month my car has refused to start twice after not being driven for 2 or more days. My boyfriend figured out the car was pulling 12 amps from the battery while it was off. He still can't figure out where those amps are coming from. My A/C still works but will occasionally get warm for a while and then cold again. Any help or suggestions would be GREATLY appreciated!

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2 Answers

Why ac blowing hot air


start off with the cheap possibilities and make your way threw.
I'd start off with replacing Air Charge temperature sensor, make sure your AC Hose isnt leaking anywhere, if those dont solve it then replace ur AC clutch, last chance would be replacing AC compressor. sometimes the compressor will malfunction randomly. or the AC clutch might malfunction aswell. covering these steps somewhere along the line you will have working AC again! good luck

May 18, 2013 | Volvo V70 Cars & Trucks

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AC compressor won't turn on by itself.


I would check the low pressure switch next. The switch cuts power to the compressor if the pressure is too low. The switch can fail.
Same goes for the high pressure safety switch.
As for leaving the relay bypassed, you would need to use a test light or meter to see if you are using battery power with the key off. I would not recommend it.

Sep 07, 2012 | 2000 Honda Accord

1 Answer

Air conditioner most of the time blows hot air, espesially after car is hot. Also the RPM of the car dont go up when airconditioner on


keep all the doors of car open for 4/5 minutes before you start driving ,
this avoids hot air blown when ac started.

Also AC runs on battery & compressor takes heavy current while starting & running to ,this causes RPM to go down.
Also check with local automaker for battery capacity remaining.

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1 Answer

Air cinditioning wont stay on, it switches to heat and wont shut off


What do you mean when you say it wont shut off? is it blowing hot air or do you just feel a lite flow of hot air even if you have the settings to cold?

If this is the problem that you always feel hot air at low flow and the ac goes to hot air then i would say one of two things, first if you have the selector to cold and you feel hot air then there may be a problem with the blend door, this door move to allow hot or cold air, the door may be broken or just a bad motor that controls it. keep in mind if the ac system shuts down for any reason the air then will be warm, it will be about the same temp as outside and maybe a little hotter.

this problem almost sounds like the ac compressor shuts off and then you are getting the outside air which is hot, there are many reasons for the compressor to shut off, it could be the compressor clutch heating up and disengaging , this would be due to a bad compressor clutch.

another reason is the fans are not working, the best thing to do is when the system starts to blow warm check and see if the compressor is running, start engine and look at the front of compressor, with ac off the front of it will not move, and then with ac on the front will spin, check it out and let me know, if it blows warm air and ac is not working then it may be compressor problem but if you are getting warm air and the compressor is spinning then it may be a door problem.

This is hard to check with out testing the system, so i listed a few things to check and let me know the out come. also the ac blows cold for how long before it gets hot air blowing out of the vents, good day.

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2 Answers

2004 camry ac light blinking and throws hot air. Suggestions?


My 2003 Toyota Camry AC often starts blowing hot air and the AC light starts blinking. I don't know why the following process works, but it does. Using the temp selector (left) reduce the temperature all the way down to Max Cold and then push the Auto button. It will start blowing out very cold air. After a little while push the temp selector to the desired temperature.

Apr 03, 2012 | Cars & Trucks

1 Answer

Yesterday, i had the AC on and it was blowing hot air all day. today it works fine


this may be due to a few things, it may be a bad blend door actuator, this is the motor that turns the door to give hot or cold air, the next thing is maybe compressor connection is loose or the system is low on gas. start the car and see if the compressor clutch kicks in then if it does try turning the temp control to hot then cold and see if that works maybe the blend door is stuck,

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1 Answer

My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


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.

Good luck

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1 Answer

AC blows cold or hot


if it is the same thing that is wrong with my frontier. check to see if the compressor is turning on when you use the ac. if not you might have a bad connection that is intermittantly preventing the compressor from getting the signal to turn on. get a service manual and a voltmeter and you can fix.

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How can tell me about the problem in AC of 2002 dodge stratus SE


Have your A/C serviced. Sounds like a valve is not opening properly and you may have a system blockage.Have the system flushed and check the Expansion valve. It could be contaminated with metal particles that indicates a faulty compressor.This problem can also indicate a faulty temperature control valve or dash controller.There is no set in stone solution.

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1 Answer

Ac compressor does not turn on when car has been sitting & it's hot outside. Works fine in the morning.


either the freon charge is about 1/3 low, or the expansion valve needs to be replaced. Freon is getting into the evaporator, but not in great enough volume to cool the air unless it is coming in cool to start with. check your ac charge, and if it is full, then have it emptied, change out the expansion valve, and recharge it

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