2002 Corolla: Turning fan on, can hear clutch?
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From: Jane Galt on 8 Apr 2010 00:03 "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote : > > "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message > news:Xns9D53C3CBFAE0AJaneGgulchxyz(a)216.196.97.142... >> "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote : >> >>> >>> "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message >>> news:Xns9D531146CEF16JaneGgulchxyz(a)216.196.97.142... >>>> This is weird. When the car is in idle and I switch the AC fan on ( >>>> with the compreassor off ) it slows the RPM slightly and sounds like >>>> the AC compressor kicking in. With the round AC compressor switch OFF. >>>> >>>> What is THAT? >>>> >>> >>> The AC compressor clutch will energize if the HVAC system is in defrost >>> mode and any fan speed other than "off" is selected, regardless of >>> whether the AC compressor switch is on or off. If the system is working >>> properly, engine RPM should hold steady or increase by about 100 RPM in >>> drive when the AC clutch is engaged. >>> >>> Slowing engine RPM could be a function of the load on the alternator. >> >> Oh ok. I was afraid it was turning the compressor on too, or something. >> >> Why would it be in defrost mode? I have the vents set to the front outlets >> and down on the feet. >> >> -- >> Jane Galt >> > > If the vents are set to the front outlets and down on the feet, the system > is not in the defrost mode and it is unlikely that the compressor is > engaging. The easy way to check whether or not the compressor clutch is > engaging or not is to open the hood and look at the compressor while the > engine is idling. When the AC button is pushed, you'll see the clutch pop. Just couldnt figure why I was hearing ANY change when merely turning the fan on low, without the compressor on. -- Jane Galt "There is no difference between communism and socialism, except in the means of achieving the same ultimate end: communism proposes to enslave men by force, socialism - by vote. It is merely the difference between murder and suicide." -- Ayn Rand
From: Ray O on 8 Apr 2010 00:54 "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message news:Xns9D53E0621E3DFJaneGgulchxyz(a)216.196.97.142... >>> >> >> If the vents are set to the front outlets and down on the feet, the > system >> is not in the defrost mode and it is unlikely that the compressor is >> engaging. The easy way to check whether or not the compressor clutch is >> engaging or not is to open the hood and look at the compressor while the >> engine is idling. When the AC button is pushed, you'll see the clutch > pop. > > Just couldnt figure why I was hearing ANY change when merely turning the > fan on low, without the compressor on. > > > -- > Jane Galt > The fan puts roughly the same load on the car's charging system at all fan speeds other than off. At low fan speed, current flows through resistors before it gets to the fan motor. At high fan speed, there is less resistance but the fan motor draws more. Your air purifier is probably drawing at least 10 amps, and added to the fan and whatever else you may have been using like a radio, headlights, fuel pump, ignition system, wipers, rear defogger, and other equipment like a GPS, inverter for a laptop, etc. and the charging system has to do some work. When there is a heavier load on the alternator, the engine has to work a little harder to turn it. The extra load drops the engine RPM a bit, the engine control computer notes the drop in RPM and adjusts the idle speed back to where it should be. The engine RPM variation is basically the same thing that happens when the AC compressor clutch is energized so it may have sounded the same to you. The difference is, with the hood open, you can usually hear an audible click when the compressor clutch is energized. -- Ray O (correct punctuation to reply)
From: Jeff Strickland on 8 Apr 2010 11:22 "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message news:Xns9D53C261EED4FJaneGgulchxyz(a)216.196.97.142... > dbu'' <nospam(a)nobama.com.invalid> wrote : > >> In article <Xns9D531146CEF16JaneGgulchxyz(a)216.196.97.142>, >> Jane Galt <Jane_G(a)gulch.xyz> wrote: >> >>> This is weird. When the car is in idle and I switch the AC fan on ( with >>> the compreassor off ) it slows the RPM slightly and sounds like the AC >>> compressor kicking in. With the round AC compressor switch OFF. >>> >>> What is THAT? >> >> is the lever position on defrost maybe? >> >> I think the compressor runs when the defrost is selected. >> >> Just a guess of course. > > No. With the output switched to the front vents. > > > Speaking of those, this car doesnt have what I call the "crotch vent" > under > the steering wheel, that the 93 has. It's shame because that really cools > my > thighs when I wear shorts in the summer. > > -- If _that_ needs to be cooled while you're driving, you're not keepng your mind on driving.
From: Jeff Strickland on 8 Apr 2010 11:26 "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote in message news:hpjk9q$7t5$1(a)news.eternal-september.org... > > "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message > news:Xns9D53C3CBFAE0AJaneGgulchxyz(a)216.196.97.142... >> "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote : >> >>> >>> "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message >>> news:Xns9D531146CEF16JaneGgulchxyz(a)216.196.97.142... >>>> This is weird. When the car is in idle and I switch the AC fan on ( >>>> with the compreassor off ) it slows the RPM slightly and sounds like >>>> the AC compressor kicking in. With the round AC compressor switch OFF. >>>> >>>> What is THAT? >>>> >>> >>> The AC compressor clutch will energize if the HVAC system is in defrost >>> mode and any fan speed other than "off" is selected, regardless of >>> whether the AC compressor switch is on or off. If the system is working >>> properly, engine RPM should hold steady or increase by about 100 RPM in >>> drive when the AC clutch is engaged. >>> >>> Slowing engine RPM could be a function of the load on the alternator. >> >> Oh ok. I was afraid it was turning the compressor on too, or something. >> >> Why would it be in defrost mode? I have the vents set to the front >> outlets >> and down on the feet. >> >> -- >> Jane Galt >> > > If the vents are set to the front outlets and down on the feet, the system > is not in the defrost mode and it is unlikely that the compressor is > engaging. The easy way to check whether or not the compressor clutch is > engaging or not is to open the hood and look at the compressor while the > engine is idling. When the AC button is pushed, you'll see the clutch > pop. > -- Ray is right. I'd not say, "pop,", I'd say you will see the clutch engage. The AC compressor is driven by a belt. The belt goes around a pulley. When the compressor is ON, the center section of the pullley can be seen to spin, when the clutch is OFF, the center section is standing still. It is very easy, depending on _where_ the compressor is physically located, to see the center scetion start and stop spinning.
From: Jane Galt on 9 Apr 2010 01:37 "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote : > > "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message > news:Xns9D53E0621E3DFJaneGgulchxyz(a)216.196.97.142... >>>> >>> >>> If the vents are set to the front outlets and down on the feet, the >> system >>> is not in the defrost mode and it is unlikely that the compressor is >>> engaging. The easy way to check whether or not the compressor clutch >>> is engaging or not is to open the hood and look at the compressor >>> while the engine is idling. When the AC button is pushed, you'll see >>> the clutch >> pop. >> >> Just couldnt figure why I was hearing ANY change when merely turning >> the fan on low, without the compressor on. >> >> >> -- >> Jane Galt >> > The fan puts roughly the same load on the car's charging system at all > fan speeds other than off. At low fan speed, current flows through > resistors before it gets to the fan motor. At high fan speed, there is > less resistance but the fan motor draws more. > > Your air purifier is probably drawing at least 10 amps, Dont have one in the 2002 yet. > and added to the > fan and whatever else you may have been using like a radio, headlights, > fuel pump, ignition system, wipers, rear defogger, and other equipment > like a GPS, inverter for a laptop, etc. and the charging system has to > do some work. No, this is in idle and the only heard difference is when I switch the fan on, to low. > When there is a heavier load on the alternator, the engine has to work a > little harder to turn it. The extra load drops the engine RPM a bit, > the engine control computer notes the drop in RPM and adjusts the idle > speed back to where it should be. The engine RPM variation is basically > the same thing that happens when the AC compressor clutch is energized > so it may have sounded the same to you. The difference is, with the > hood open, you can usually hear an audible click when the compressor > clutch is energized. THis is inside, with hood closed. -- Jane Galt "There is no difference between communism and socialism, except in the means of achieving the same ultimate end: communism proposes to enslave men by force, socialism - by vote. It is merely the difference between murder and suicide." -- Ayn Rand
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