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Air Con Problem?

Macan360

New member
All

My 987.1 Cayman S has started making a whining noise at about 1900 RPM. It also sometimes makes a noise like two pieces of metal rubbing together. This comes and goes but can be fairly loud and sounds like its coming from front of the car.

I have now noticed that if you turn the air conditioning fan off which automatically cancelles the auto. The whine and the metallic noise goes away.

This would seem to indicate the air conditioning in some way but I can't work out why the engine RPM has an affect. I drove it 25 miles with air con on and the whine occurs. Drive 25 miles with air con off and no whine occurs. The metallic noise is only audible at slow speed because of general vehicle noise but only occurs with air con in auto it seems.

I am interested as to what is going on. Car is on a Porsche warranty so not over concerned but would like your thoughts before booking it in. Talking with my local OPC they have offered no opinion

Thanks

Cayman295 (Trevor)
 
The air con compressor will whine if low on refrigerant. But obviously that should be coming from the rear of the car. The fans at the front will be running when air con is on so could be one of them.

 
Trevor,

From what you say I assume that you have climate control rather than just the basic air con?

Either way, if you actually turn off the fan (with no bars on the display) and the noise disappears then the fault most probably lies with the fan itself rather than the radiator fans to which Geoff refers. Turning off the air con should disconnect the compressor drive and so indicate if it's the source of your whine, but I'm sure that you can still adjust the fan speed.

The best way to check the functioning of the radiator fans is to set the air con to LO - boths fans should be running at max speed.

The car's under warranty so just let Porsche sort it out.

Jeff

 
Hi All

Thanks for the response

Talking to an engineer today (Not Porsche) he thinks that inside the compressor is a clutch like system which when worn sounds like plates rubbing together. The whine is probably the compressor pump.

Porsche will be next stop. Unfortunately waiting to get my 911 back, see separate post. It seems the waterpump had catastrophically failed on it, awaiting confirmation.

Will then drive Cayman in and collect 911.

Not very reliable these Porsches [:)]

Will let you know the diagnosis shortly

Thanks

Trevor

 
All

Got diagnosis today

it appears 2 o rings have failed in the air con system allowing all the gas to escape

The whine and noises are coming from the pump due to lack of gas

Appears to be a £400 fix

 
Cayman295 said:
All

Got diagnosis today

it appears 2 o rings have failed in the air con system allowing all the gas to escape

The whine and noises are coming from the pump due to lack of gas

Appears to be a £400 fix
Ouch that seems a little pricey? Is that quote from a Porsche repairers?

 
Hi

Porsche warranty paid and covered cost of repair 100%

That's part of its cost recovered

All sorted now

Trevor

 
Apparently the Condensers are not covered by Stone or ingress damage to units Nice to see its sorted

Water cooled 911 have a water pump that's designed to shear as a failed auxiliary belt causes less damage than a total water pump failure

 

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