I have searched but have not found a thread which addresses the relocation and the procedure required to relocate the Fin Sensor for the A/C. While I have been in the dry air of West TX and Southern NM, it has not been an issue. However, now that I find myself going to Central TX the darn A/C seems to freeze up every 30 min. or so. Does anyone have a recommendation for the relocation of this Sensor?.....thanks.

 

I just did a search on Google and Yahoo with no results. I don't know what this sensor controls. First time I ever heard of it.

However, when your evaporator starts to freeze it's generally because the system is low on freon. If your vent temp is less than 40 that may be the case.

 

CostalDav covered it. Check you vent temps, or, just charge your system. Mine tended to freeze up when I went to east Tx a couple times, I checked the vent temp while over there and verified the vent temp was not right, my dealer charged mine under my warranty, problem solved. Not been a problem since, that was close to 4 years ago.


CD

 

Well, it must be my compressor. I am actually over charged a bit (38 PSI on the low side). However my temp on the drivers side fluctuates from 35 to 55 degrees and from 40 to 72 degrees on the passenger side. My air flow is initially good on both sides, but will become very reduced if the system freezes up. Temps seem to vary with RPM.

 

Thoughts?

 

Well, I finally found Spooler's and Beem0's thread......I hope a line with the orifice will fix my issue. I may try adding a pusher fan when I find Spooler's thread.

 

PERFORMANCE TEST PROCEDURE
Review Safety Warnings and Cautions before performing
this procedure (Refer to 24 - HEATING &
AIR CONDITIONING/PLUMBING - WARNING) and
(Refer to 24 - HEATING & AIR CONDITIONING/
PLUMBING - CAUTION). Air temperature in test
room and on vehicle must be 21° C (70° F) minimum
for this test.
NOTE: When connecting the service equipment
coupling to the line fitting, verify that the valve of
the coupling is fully closed. This will reduce the
amount of effort required to make the connection.
(1) Connect a tachometer and a manifold gauge set
or A/C recycling/charging station.
(2) Set the A/C-heater mode control in the Recirculation
Mode position, the temperature control **** in
the full cool position, and the blower motor switch to
the highest speed position.
(3) Start the engine and hold at 1,000 rpm with
the A/C compressor clutch engaged.
(4) The engine should be warmed up to operating
temperature with the doors closed and windows
open.
(5) Insert a thermometer in the driver side center
panel A/C-heater outlet and operate the engine for
five minutes.
(6) The compressor clutch may cycle, depending
upon the ambient temperature and humidity.
(7) With the compressor clutch engaged, record the
discharge air temperature and the compressor discharge
pressure.
(8) If the discharge air temperature fails to meet
the specifications in the A/C Performance Temperature
chart, refer to the Pressure Diagnosis chart.

 

I did not see anything about freezing up. Normally, I would assume that you had low refrigerant, however, you said that you have good pressure. I'd look at your orface tube to see if that was clogged. I'd also make sure that the condenser was cleaned. If the high pressure switch was going out, normally it would not engage the compressor, and simulate a compressor failure, however, I guess it could keep the clutch engaged the entire time. Does your clutch engage and disengage, or does the compressor run all the time? This sounds like a switch failure to me. I'm not an AC expert by any means, but this is what I could come up with.

 

Thanks

 

My 03 used to freeze up. It was under warranty, and fully charged. Dealer relocated temp sensor (I think per a TSB).