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2004 Explorer Frequent AC cycling on/off while driving



 
 
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  #1  
Old June 14th 05, 12:26 AM
Growler
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Default 2004 Explorer Frequent AC cycling on/off while driving

I have a friend with a 2004 Explorer with an AC problem. While at idle
everything works fine. AC is quiet, cold,and seems to cycle on and off
properly.

While driving, at park and bringing the RPM up, or in drive w/ e-brake
on revving up the motor the AC compressor starts cycling on and off .
The cycling interval is about 12-15 seconds. Each time the AC turns on
there is a fairly loud chirp. I am guessing from the electric clutch at
the compressor.

He has already taken it to a dealer who says nothing is wrong and it
supposed to be like that. I am guessing they are wrong.

Can anyone point me in the right direction??

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  #2  
Old June 14th 05, 12:21 PM
Mikepier
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It is normal for the compressor to cycle on and off. It might cycle
differntly depending on the operating conditions.

  #3  
Old June 14th 05, 12:50 PM
Growler
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Hi Mike,

Thanks for the reply. I know it is normal for cycling to occur with
the AC compressor. What this is doing is abnormal. The AC runs normal
until about 2000RPM after which it continuously cycles on/off on ~12
second intervals.

Any ideas??

  #4  
Old June 14th 05, 01:20 PM
bob
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Growler wrote:
>
> I have a friend with a 2004 Explorer with an AC problem. While at idle
> everything works fine. AC is quiet, cold,and seems to cycle on and off
> properly.
>
> While driving, at park and bringing the RPM up, or in drive w/ e-brake
> on revving up the motor the AC compressor starts cycling on and off .
> The cycling interval is about 12-15 seconds. Each time the AC turns on
> there is a fairly loud chirp. I am guessing from the electric clutch at
> the compressor.
>
> He has already taken it to a dealer who says nothing is wrong and it
> supposed to be like that. I am guessing they are wrong.
>
> Can anyone point me in the right direction??

  #5  
Old June 17th 05, 03:25 AM
Jeff
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Default

The faster the RPM, the faster the compressor builds pressure in the system,
so it cycles off to normalize and turns back on when needed. This will
occur more frequently at higher RPMs. If if blows cold I would think it is
just fine.


"Growler" > wrote in message
oups.com...
> Hi Mike,
>
> Thanks for the reply. I know it is normal for cycling to occur with
> the AC compressor. What this is doing is abnormal. The AC runs normal
> until about 2000RPM after which it continuously cycles on/off on ~12
> second intervals.
>
> Any ideas??
>



  #6  
Old June 28th 05, 04:10 PM
Reggie Dunbar
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Posts: n/a
Default

Is it cooling? If not, you may have low coolant or a bad AC cycle switch.


"Growler" > wrote in message
oups.com...
>I have a friend with a 2004 Explorer with an AC problem. While at idle
> everything works fine. AC is quiet, cold,and seems to cycle on and off
> properly.
>
> While driving, at park and bringing the RPM up, or in drive w/ e-brake
> on revving up the motor the AC compressor starts cycling on and off .
> The cycling interval is about 12-15 seconds. Each time the AC turns on
> there is a fairly loud chirp. I am guessing from the electric clutch at
> the compressor.
>
> He has already taken it to a dealer who says nothing is wrong and it
> supposed to be like that. I am guessing they are wrong.
>
> Can anyone point me in the right direction??
>
>



  #7  
Old June 29th 05, 04:11 AM
HerkyJerky
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Default

So your saying its on 12 seconds, then off 12 seconds, then on 12
seconds, ..... . A total clutch cycle time of 24 seconds? What was
the temperature outside? The only standard test that specs clutch
cycle time is to (1) Place vehicle in park, (2) Place A/C in Max
cooling and fan modes (3) Hold engine RPM at 1,500 RPM, (4) Allow
system to stabilize with interior temp at 70-80=B0F. The times vary
widely depending on outside air temp.

 




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