MINI2

dcfkan · Jun 19th, 2005, 04:38 PM

Has anyone else noticed that the chiller unit on manual air-con cut off when the car reached a certain (unspeakable) speed?

It happened to a certain souped up MCS I know

Just wondering

DK

:apple:

MrSpaz · Jun 19th, 2005, 06:56 PM

I have the auto A/C, but I'd imagine the compressor for either unit would disengage at higher RPMs in order to save the compressor. As you may or may not be aware, the compressor makes use of an electromagnetic clutch to grab the (otherwise neutral) pulley and turn the compressor. There's probably a sensor in the compressor itself that cuts the clutch when revs get too high.

I wasn't really paying attention to the air conditioner, but at ~ 125 mph the revs can climb pretty high. Amazingly the ride was still very smooth. Not as much vibration or noise as I would have expected.

UKC4 · Jun 19th, 2005, 07:13 PM

If it cuts out, i could only suggest is to route more power to the engine. Tell us the speed? You could of been on a race track for all we now!?!?!?!?!

r34ver · Jun 19th, 2005, 08:03 PM

i find my aircon whines at high speed, at least i figure that it is the aircon because when i turn the ac off the noise stops.. coincidence?

aquabubble · Jun 19th, 2005, 08:07 PM

Quote: Originally Posted by r34ver

i find my aircon whines at high speed, at least i figure that it is the aircon because when i turn the ac off the noise stops.. coincidence?

It could be a number of things. My a/c went on the blink in my 206 GTI - high pitched whining - except that was at all engine speeds. Turned out to be the bearings and the whole unit had to be replaced (which is expensive I can tell you)! Don't want to worry you, but it could be an early sign of a possible future failure. Might be worth speaking to the service guys about it.

dietcokeplease · Jun 19th, 2005, 08:54 PM

All a/c units on most cars are designed to cut out at generally more than 85% of the throttle opening. It's to give you the most power when you need it the most. So at very high speed it should cut out. It's normal and not a problem.

Hat · Jun 20th, 2005, 07:17 AM

Quote: Originally Posted by r34ver

i find my aircon whines at high speed, at least i figure that it is the aircon because when i turn the ac off the noise stops.. coincidence?

the air con pump has its own cooling fan which cuts in when things get hot & its notoriously noisy - it could be that you're hearing

Jun 19th, 2005, 04:38 PM	#1
dcfkan In exile, down SOUTH! Join Date: Aug 2001 Location: London WC1 Local Time: 02:06 AM Posts: 13,580 Offline	Manual Air-con cut off at certain (unspeakable) speed? Has anyone else noticed that the chiller unit on manual air-con cut off when the car reached a certain (unspeakable) speed? It happened to a certain souped up MCS I know Just wondering DK :apple:

Jun 19th, 2005, 08:03 PM	#4 (permalink)
r34ver Sergeant Pepper Join Date: Aug 2004 Location: Hertfordshire Local Time: 02:06 AM Posts: 348 Offline	i find my aircon whines at high speed, at least i figure that it is the aircon because when i turn the ac off the noise stops.. coincidence? SGT Pepper

Jun 19th, 2005, 08:54 PM	#6 (permalink)
dietcokeplease Official MINI2 Fluffer Join Date: Jul 2001 Location: Spearmint Rhino Local Time: 01:06 AM Posts: 5,315 Offline	All a/c units on most cars are designed to cut out at generally more than 85% of the throttle opening. It's to give you the most power when you need it the most. So at very high speed it should cut out. It's normal and not a problem. There is just one moon and one golden sun; And a smile mean friendship to ev'ryone; Through the mountains divide, and the oceans are wide; It's a small world after all.

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Jun 19th, 2005, 06:56 PM	#2 (permalink)
MrSpaz MINI2 Newbie Join Date: Jan 2003 Local Time: 01:06 AM Posts: 47 Offline	I have the auto A/C, but I'd imagine the compressor for either unit would disengage at higher RPMs in order to save the compressor. As you may or may not be aware, the compressor makes use of an electromagnetic clutch to grab the (otherwise neutral) pulley and turn the compressor. There's probably a sensor in the compressor itself that cuts the clutch when revs get too high. I wasn't really paying attention to the air conditioner, but at ~ 125 mph the revs can climb pretty high. Amazingly the ride was still very smooth. Not as much vibration or noise as I would have expected.

Jun 19th, 2005, 07:13 PM	#3 (permalink)
UKC4 MINI2 Sex God & etc...... My Classifieds Join Date: Aug 2003 Location: Bradford Local Time: 02:06 AM Posts: 1,335 Offline	If it cuts out, i could only suggest is to route more power to the engine. Tell us the speed? You could of been on a race track for all we now!?!?!?!?!

Jun 19th, 2005, 08:07 PM	#5 (permalink)
aquabubble This won't hurt a bit! Join Date: Jun 2005 Location: Magor/Undy, Wales Local Time: 02:06 AM Posts: 82 Offline	Quote: Originally Posted by r34ver i find my aircon whines at high speed, at least i figure that it is the aircon because when i turn the ac off the noise stops.. coincidence? It could be a number of things. My a/c went on the blink in my 206 GTI - high pitched whining - except that was at all engine speeds. Turned out to be the bearings and the whole unit had to be replaced (which is expensive I can tell you)! Don't want to worry you, but it could be an early sign of a possible future failure. Might be worth speaking to the service guys about it.

Jun 20th, 2005, 07:17 AM	#7 (permalink)
Hat Wolves Did It! My Classifieds Join Date: Oct 2002 Local Time: 02:06 AM Posts: 15,956 Offline	Quote: Originally Posted by r34ver i find my aircon whines at high speed, at least i figure that it is the aircon because when i turn the ac off the noise stops.. coincidence? the air con pump has its own cooling fan which cuts in when things get hot & its notoriously noisy - it could be that you're hearing

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