Air Conditioning "Whooshing" Sound

**Mark Elvin** · 09-17-2011, 04:43 AM

My A/C makes an odd "whooshing" sound when I switch it on. It sounds like its coming from somewhere behind the glovebox area on the passenger side (LH side on UK cars), although it appears to be blowing icy cold.

When I'm just using the blower/heater with the AC off the sound dissapears.

Anybody got any thoughts at to a possible cause please?

retepsnikrep · 09-17-2011, 05:19 AM

Record it if possible.

Willie Williford · 09-17-2011, 04:10 PM

Junk in the squirrel cage of the motor. It's easy to get to. There was a post a long time ago about leaves, etc in the blower.

HTH
Willie

gilbertguy · 09-17-2011, 06:08 PM

Does it sound like a vaporous gas leaking out of something? I've heard other AC systems do this and it usually has to do with the compressor turning off and the high pressure freon going through the orface to the low pressure side. Can almost have a gurgle to it sometimes.

**jack9994** · 09-19-2011, 04:08 PM

Mark
You need your aircon recharging - seems to happen when you dont use aircon alot
Cheers
John

jonnyvtec · 09-21-2011, 04:01 AM

Mine sounds very similar aswell, almost a gas leak/motor working somewhere in the HVAC. Could well be something to do with the system, its not as effective as it used to be either so probably worth a regas.

**Mark Elvin** · 09-21-2011, 04:58 AM

Quote:

Originally Posted by jonnyvtec

Mine sounds very similar aswell, almost a gas leak/motor working somewhere in the HVAC. Could well be something to do with the system, its not as effective as it used to be either so probably worth a regas.

I'm off to get system checked just after lunch, leak check, efficiency check & re-gas/lube if required.

**Mark Elvin** · 09-21-2011, 09:52 AM

OK, results are in on the A/C re-gas, against my better judgement I popped into my local Kwik Fit to let them have a go at the A/C.

I thought it was actually working well before I took the car in, how wrong was I.

They did a temp test with the A/C on before doing any work, air from the vents was 14c.

They proceeded to do a re-gas, firstly emptying the old gas (0.07 kg removed) and the old lubricant (3 grams removed). Then they did a vac test at -40psi for 20mins, the vacuum held stable during this time indicating no leaks.

They finally replenished the system with 0.55kg of refrigerant and 14ml of lubricant.

The system was tested with an output air temp of 3c.

The cost for the work was a very reasonable £49.

Sent from my Autoguide iPod touch app

retepsnikrep · 09-21-2011, 09:58 AM

Nice result.
I really need to get mine done as well, next spring I think ready for summer.
How much was it? Where did you get it done?

**Mark Elvin** · 09-21-2011, 10:32 AM

Quote:

Originally Posted by retepsnikrep

Nice result.
I really need to get mine done as well, next spring I think ready for summer.
How much was it? Where did you get it done?

Sorry Peter, should have said in the post, have updated. It was Kwik Fit and the cost was just £49. I'm very happy.

Sent from my Autoguide iPod touch app