how do you check freon on central ac and what should the guages read.
AC stands for "As Custodian for"
Check the ac compressor and clutch to see where the noise is coming from. Also check the compressor drive belt for wear.
If 1993 suburban rear ac not cold how can check the expansion valve?
Check the thermostat.
Accu check
Check if the blower motor is working, and you will need to check the pressure in the AC line.
Check charge. (R12)
Check the alternator or the main lead of the ac wire to check for either if there is too much pressure is being applicated to the alternator or if theirs a shortage in the main lead wire to the ac
Have a shop check the AC system pressure
Check
Check relay