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Old December 6th, 2007, 10:40 PM   #1
GreaseMonkey
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Don't freak if your 5.9L A/C compressor clutch isn't kicking in this winter.

Apparently there is an ambient temp sensor for the system that will only cycle the clutch if it is warmer than 32 degrees out. I never knew that. Every other vehicle I've owned or worked on it would cycle no matter what.

I thought mine was broke, didn't want to screw with it, so the dealer was able to divulge that information to me for $40 diag. fee.

I couldn't find any info online about it, but I'm assuming it would be similar with other Chrysler products.
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Old December 7th, 2007, 06:36 PM   #2
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So they decided you don't need dry air when its below freezing?
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Old December 7th, 2007, 06:54 PM   #3
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So they decided you don't need dry air when its below freezing?
Apparently. I don't quite know what purpose it serves, but when air gets down to 20 some degrees, it isn't going to be holding much humidity anyways. Why go the extra step with the system is beyond me.
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Old December 7th, 2007, 07:10 PM   #4
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Apparently. I don't quite know what purpose it serves, but when air gets down to 20 some degrees, it isn't going to be holding much humidity anyways.
Yes, but that's outside the truck. The HVAC blows air on the inside of the truck which is where your breath is. I agree, you bought a stupid truck. :tonka:
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Old December 8th, 2007, 03:55 PM   #5
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Yes, but that's outside the truck. The HVAC blows air on the inside of the truck which is where your breath is. I agree, you bought a stupid truck. :tonka:
Kettle...pot...black?
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Old December 8th, 2007, 04:01 PM   #6
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Kettle...pot...black?
I don't have a 360.


But I'm not going outside and testing it.
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Old December 8th, 2007, 04:03 PM   #7
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my 318 does the same thing
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Old December 8th, 2007, 07:58 PM   #8
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the reason they don't want the A/c compressor turning on when the outside temp is below 32 degrees is because the evaporator will freeze and clog with ice in which the result is no air flow.
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Old December 8th, 2007, 10:16 PM   #9
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the reason they don't want the A/c compressor turning on when the outside temp is below 32 degrees is because the evaporator will freeze and clog with ice in which the result is no air flow.
x2

and we did it at Ford because the system could potentially burst a line in cold weather.
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Old December 8th, 2007, 11:02 PM   #10
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clog with ice in which the result is no air flow.

I'm thinking that would have nothing to do with air flow in the HVAC system at all. Ever.
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Old December 9th, 2007, 06:39 AM   #11
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actually it will affect air flow cuz in a vehicle with A/c all air goes through the evaporator core regaurdless of what you set the controls at. in some vehicles the evap. acts as an air filter for the system for ones that don't have a cabin air filter. if you've ever looked at the a/c lines anytime with the a/c running you'll notice moisture plus the low pressure side line gets quite cold. and the evaporator is colder then that.
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Old December 9th, 2007, 07:00 AM   #12
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Old December 9th, 2007, 10:54 AM   #13
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Originally Posted by Kodiak450r View Post
actually it will affect air flow cuz in a vehicle with A/c all air goes through the evaporator core regaurdless of what you set the controls at. in some vehicles the evap. acts as an air filter for the system for ones that don't have a cabin air filter. if you've ever looked at the a/c lines anytime with the a/c running you'll notice moisture plus the low pressure side line gets quite cold. and the evaporator is colder then that.
Yes, I know. The air does not travel through those lines. I believe what you are thinking of is the refrigerant line freezing, which I don't disagree with.
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Old December 9th, 2007, 12:12 PM   #14
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I though it was because at low enough air temps the refrigerant could become liquid on the low side and blow your compressor. I'm pretty sure every A/C system made today has a low temp cut out.
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Old December 9th, 2007, 12:16 PM   #15
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Yes, I know. The air does not travel through those lines. I believe what you are thinking of is the refrigerant line freezing, which I don't disagree with.
If your evaporator freezes solid and is in line of the airflow through your heater box(before the heater core so it gets outside air temp) you get no flow through your heater box and therefore no heat either. GO google something else and come back when you've actually turned a fucking wrench.
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Old December 9th, 2007, 01:10 PM   #16
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If your evaporator freezes solid and is in line of the airflow through your heater box(before the heater core so it gets outside air temp) you get no flow through your heater box and therefore no heat either. GO google something else and come back when you've actually turned a fucking wrench.


I'd suggest not making assumptions that he has never wrenched on anything.
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Old December 9th, 2007, 02:28 PM   #17
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Quote:
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I'd suggest not making assumptions that he has never wrenched on anything.


its alright, kodiak went to UTI
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Old December 9th, 2007, 03:37 PM   #18
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hahaahah


This is funny. PP doesn't know how the AC system works.
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Old December 9th, 2007, 03:42 PM   #19
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If your evaporator freezes solid and is in line of the airflow through your heater box(before the heater core so it gets outside air temp) you get no flow through your heater box and therefore no heat either. GO google something else and come back when you've actually turned a fucking wrench.
What you're suggesting is that enough moisture would be brought in from the outside (in air temps that we've already noted don't have much humidity in the first place) that the air passage inside the in-line evaporator would become a block of ice and not let air past it. In reality, I think the lines would freeze up before the core would suck in enough moisture to fill the air cavities with solid ice and completely block airflow. The purpose is along the lines of what Scooter mentioned - to keep the refrigerant lines and compressor from being damaged. Maybe I don't understand it as well as others do and maybe it was a different configuration, but I've had A/C systems freeze on me and they didn't stop blowing air.

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Old December 9th, 2007, 03:48 PM   #20
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Quote:
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What you're suggesting is that enough moisture would be brought in from the outside (in air temps that we've already noted don't have much humidity in the first place) that the air passage inside the in-line evaporator would become a block of ice and not let air past it. In reality, I think the lines would freeze up before the core would suck in enough moisture to fill the air cavities with solid ice and completely block airflow. The purpose is along the lines of what Scooter mentioned - to keep the refrigerant lines and compressor from being damaged. Maybe I don't understand it as well as others do and maybe it was a different configuration, but I've had A/C systems freeze on me and they didn't stop blowing air.
So where's the website you found that on off of your Google search? :tonka:
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