2002 Corolla: Turning fan on, can hear clutch?
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From: Jane Galt on 7 Apr 2010 03:41 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?
From: Ray O on 7 Apr 2010 14:38 "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. -- Ray O (correct punctuation to reply)
From: Jane Galt on 7 Apr 2010 21:06 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. -- 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: Jane Galt on 7 Apr 2010 21:14 "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 "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 7 Apr 2010 23:50 "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 O (correct punctuation to reply)
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