Using an Arduino to Run a Vehicle's A/C Compressor Cycle?

i trying figure out how use arduino pro mini clone run compressor cycle in 1998 nissan frontier pickup (d22 chassis, 2 wheel drive, ka24de gas 4 cylinder/5 speed manual. sold navarra in markets.). plan use 10k thermistor sense temperature of evaporator core cause arduino cycle relay on , off. way nissan wired it, air conditioning system has compressor , idle speed compensator wired  if 1 goes on other too. therefore plan use part of wiring run see no reason not to.  tested temporarily bypassing computer's air conditioning functions , still works, original binary switch ran in series prevent excessive pressure. doesn't work pcm's air conditioning control circuit turns compressor off when ignition on , on ignition turned off. else still works though not want replace expensive pcm, since truck has 384,000 miles on , not driven regularly.

my issue how write loop. need have compressor run until temperature reaches 34 f , shut off. want wait until temp rises 38-40f, turn on compressor clutch , repeat cycle. needs shutdown period evaporator core not freeze , hinder airflow. planning use sample sketch found read 10k thermistor returns temperature , add loop code once figured out. unfortunately not seem able find sample code particular situation. apologize if simple problem new programming.

there lot of info in description , i'm not sure parts relevant.

it looks me program needs this

if temp > 38
   switch on
if temp < 34
   switch off

but suspect there may bit more it.

can write down steps required in simple style this?

...r

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