2015 Toyota Sieanna A/C Inoperative

David Technician Philadelphia, Pennsylvania Posted   Latest  

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.

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Richard Technician
Virginia Beach, Virginia
Richard Default
 

With the compressor clutch not engaged and the evap at cabin temperature, what is the flow sensor voltage ?

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Tim Technician
Reading, Pennsylvania
Tim Default
   

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

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Shaya Mobile Technician
Jackson Township, New Jersey
Shaya Default
 

Check flow sensor via live data, it needs to see 3.8v-4.2v for it to activate compressor.

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Interesting
Tom Service Manager
Copiague, New York
Tom Default
 

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

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Bill Owner/Technician
Jackson, Michigan
Bill Default
 

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.

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David Technician
Philadelphia, Pennsylvania
David Update
 

thank You guys for your input!

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Rudy Technician
Montebello, California
Rudy Default
 

David- Did you fix it?

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David Technician
Philadelphia, Pennsylvania
David Resolution
 

Replaced AC compressor with a used unit and ac works, thank you guys for your help.

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