evap temp switch
 

I have been reading a few posts today about modifying the evap temp switch to keep the compressor from cutting off to early and it got me thinking. I pulled out the switch and left it hanging and went for a cruise and I was able to achieve 38 degrees at the center vents wheras before i could get at best maybe 46 degrees on a long highway run. If I solder in a resistor, to keep the compressor from cutting out at around 45-50 degrees, would it be safe to let it go down to say 40 degrees inside the evaporator box or could I let it get colder in there? Also, does this kind of mod really work on a 95 degree sunny humid texas day? So far I have only tried it at night when the ambient was around 83 degrees.

Ours both do about 38 at the center vent with the sensor in place. Maybe you should simply replace the sensor.

Is there a way to test if the sensor is in range, before I replace it?

Just as I suspected. It makes no difference at stop and go driving, but does wonders on highway temps. Its gone down to 36 degrees at the vents. BBBRRRRR

The values for the EVAPORATOR temp sensor:

10C=18.3-21.5Kohms
25 = 9.5-10.5
35 = 6-7
45 = 3.5-4.5

Thanks