Question about 2001 Volkswagen Jetta TDI

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My ac blows nuetral air and the compressor does'nt come on when the car is started.

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90% of the time with car and home air conditioners it is the capacitor that has blown. They are usually pretty cheap and in most cases easy to get to.

You may be able to find a step by step repair guide on the net. Locate the capacitor and remove it, but first remember or write down the wire locations first.
Once removed most all capacitors are flat on top and bottom and by design when they go bad they blow outwards like a dropped coke can. it will have a concave or bowing outwawd on one or both top and bottom. Also most ac repair shops will test it for free.

In my home I saved $180 - $350 changing it myself. The capacitor was only $50

L8ers

Posted on Sep 12, 2010

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I have a 2002 pt cruiser that is blowing the ac 10amp fuse repeatedly. I mean within minutes of changing it. Also the ac is only blowing hot air. Can someone please help.


An AC system blowing hot air is usually due to a low freon charge or a non operational AC compressor. If the fuse blows, disconnect the compressor electrical plug and turn on the AC. If the fuse doesn't blow, suspect a compressor problem. If the fuse continues to blow with the compressor disconnected, there is a direct short between the ON/OFF switch and the compressor which can take hours to diagnose

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You probably replace the wrong switch. I believe the high pressure switch is mounted in the back of the compressor. Pull the plug and jump it. If it works, replace the switch. I don't recommend you leave the jumper in the plug. If it the A/C pressure is to high, you could blow lines and such. Costing you a lot of money.

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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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Blows cold when first started and then blowes warm


I would replace the AC compressor cycling switch it may be sticking have seen it a number of times. The switch is located in the receiver dryer on the passenger side of the engine compartment. See picture below.


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If this isn't the problem the AC compressor relay may also cause this, flip a coin.

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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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Put new AC compressor on, ice cold air for 2 days then blowing cool to warm air. Compressor is working but air not cold. Sometimes will get a small burst of cooler air but doesn't last.


You did'nt mention if you got the system refilled with Refrigerant after the Compressor was replaced or not. If not, that could be the problem.

Jul 25, 2011 | 1995 Mercury Villager

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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2 Answers

The AC stops blowing air for a while and then re-start working normaly.


Have you noticed that the AC quits blowing cold air when you are heavy on the throttle, or climbing a hill? Does it return to blowing cold air when you let back off the throttle and relieve the load from the engine?

If you answered YES to those questions, your AC is operating normally. AC compressors take quite a bit of power from the engine to operate. In vehicles with smaller engines, the AC compressor will disengage when there is a heavy demand for power placed on the engine, and you will not get cold air. When that demand is gone, it re-engages power to the AC compressor.

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