2015 Toyota Sieanna A/C Inoperative
Good evening everyone, I have a 2015 Toyota Sieanna a/c is inoperative. Performed healthcheck no DTC stored. Evac and recharged a/c system was low about 0.2 lbs and still inoperative. I checked fuses and relays. Also checked the magnetic clutch circuit with noid Light at the a/c compressor. When I perform active test on magnetic clutch relay with tech stream a/c blows cold. Any help or guidance would be appreciated. Thank you.
With the compressor clutch not engaged and the evap at cabin temperature, what is the flow sensor voltage ?
With the compressor clutch engaged via active test check and see if you have a signal out of the compressor speed sensor (also referred to as the lock sensor). If the a/c amplifier does not see compressor speed as soon as it tries to engage the clutch it will assume that the compressor is locked and disengage the clutch to avoid damaging the belt
Check flow sensor via live data, it needs to see 3.8v-4.2v for it to activate compressor.
is the cooling fan on? and if it is does anything changes when you raise RPM to 2000 does is change anything at the vents
Check the flow sensor voltage using scan data with the A/C system off engine at idle. As Shaya G. stated voltage must be 3.8 to 4.2 to engage compressor. Flow sensor sold with the compressor but there is availability in the aftermarket to buy only the sensor as well.