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Owl, whistling noise coming from AC vents

MacPhillips on Wed March 25, 2009 9:39 AM User is offline

Year: 2000
Make: VW
Model: Beetle
Engine Size: 2.0L

Hi Guys

Could you please help me!

I just recently took my car to the mechanic because my AC only had hot air coming out of the vents so the mechanic said that he would gas up the cylinder for me but when I received it back from the workshop and I drove my beetle with the AC on there was a whistling and owl (oooo) noise coming from the vents and certain times the dash board would vibrate this would then retard the engine and the car loses power. Could someone please help me I thought it was because they gased my cylinder too much could this be the problem???????

Chick on Wed March 25, 2009 5:17 PM User is offlineView users profile

Just a guess, but I suspect the expansion valve. Engine dying could be due to high side pressure, listing both pressure is a must on this one.. Did he find and fix your leak? The refrigerant had to go somewhere, it's not consumed.. hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

MacPhillips on Thu March 26, 2009 10:23 AM User is offline

Quote
Originally posted by: Chick
Just a guess, but I suspect the expansion valve. Engine dying could be due to high side pressure, listing both pressure is a must on this one.. Did he find and fix your leak? The refrigerant had to go somewhere, it's not consumed.. hope this helps..


Thanks for replying Chick!

I haven't a clue what you mean about listing both pressures or a leak I'm sorry but I'm new to this and I haven't had a problem with my car AC before, could you explain it to me in lamess terms please.


JACK ADAMS on Thu March 26, 2009 11:59 AM User is offline

Did the shop explain what the problem was with the car? Why did it need to be gassed as the mechanic said? The noise could be the TXV (thermo expansion valve/block) and the other noise could be the compressor. When a system looses refrigerant it could also loose oil for the system. The compressor must have refrigerant oil to keep things running properly or you may end up with abnormal compressor noise or failure.

I would suggest you talk with the shop that did the service and find out what work was performed to the a/c system…. Come back with this data and we may be able to further assist you in this matter.

NickD on Thu March 26, 2009 12:41 PM User is offline

Recharged the system would be the correct terminology, but leaves some question as to how it was recharged. You said it was blowing hot, is it blowing cold now? Chick is saying your refrigerant leaked out, and apparently it did, Jack Adams is also questioning if some oil leaked out as well. Perhaps your system was not properly evacuated and you have air in the system that would also give you the symptoms you are experiencing and if that leak was not repaired, you will soon be back to where you were.

In regards to the whistle, leaves way too much for speculation as to where this noise is coming from and under what conditions, and can only assume your engine doesn't tend to stall with the AC off. Is that whistle noise proportional to blower speed? You could have more than one problem.

None of us are there to hear nor witness your problem, only have your words to go by.

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