F53 Chassis Air

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phil-t

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Jul 10, 2017
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Ogdensburg, NY
Got a slow leak in my chassis AC on my '09 F53.  I think I found it (in the way of an oily residue around this sensor.  Anyone know what this is?  What I can find in the parts diagrams from RockAuto on the heating cooling diagrams it is called an "ambient air temperature sensor".
Here is a PIC of it installed in my system.
 

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solarman

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Feb 8, 2018
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618
Location
Texas
I disagree with the "ambient temperature sensor" because it's directly connected to the high side refrigerant line, and that line will get very hot during
normal operation and therefore cannot measure "ambient temperature"..

from the photos you have, I would say that's a high side pressure switch, just before
the filter/drier cannister. it's not a DIY replacement. you will need to take it in
to an a/c shop and have them replace the sensor and o-ring seal then recharge the system.




 

phil-t

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Joined
Jul 10, 2017
Posts
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Location
Ogdensburg, NY
Thanks, I have a AC tech buddy that can do the work - I was looking for a part source.  I found it at a local auto parts store.
Thanks for the help.
 

House Husband

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Jan 26, 2019
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K.C.MO.
It's pretty much SOP to have a schrader valve in the fitting the sensor screws in to. Refrigerant loss will be minimal when changing the sensor. It's easily a DIY job.
 

phil-t

Well-known member
Joined
Jul 10, 2017
Posts
1,414
Location
Ogdensburg, NY
House Husband said:
It's pretty much SOP to have a schrader valve in the fitting the sensor screws in to. Refrigerant loss will be minimal when changing the sensor. It's easily a DIY job.
Yes, I did it.  No problems - had a gauge on the recharge.  I just really needed to know what that sensor was, in order to get a replacement.  Local auto parts had it.
There are all levels of DIY capabilities in different folks.
 
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