Air Conditioner Behavior

[Rockster]

I just had a loaner P100D Model S yesterday and it was doing this. It was about 98 or so outside and the car was cycling from cold air to warm-ish air while driving. It was not pleasant.

 

[Refrus_T]

Mine was doing this also so I took it to the SC and they couldn't reproduce it there. So I don't know what to do about it if they can't find anything wrong.

 

[SSonnentag]

I just got my 2017 S100D back from the shop yesterday for this very issue. See the image below for what was done.

I was told that there were intermittent communication errors between the air suspension and the AC. Since there was an updated harness, I would think this is a known problem.

 

[Bmorton]

Was plagued by symptoms just like OP in Dec. 2017 S. Tampa service was great about spending 30+ minutes driving around with the mechanic trying to reproduce but, of course, was one of the few times it didn't do it. Anyway, they ended up checking logs and repair shown below seems to have done the trick:

Concern: Customer: A/C blow warm air after a few minutes of driving.

Corrections: Cabin HVAC General Diagnosis

Tested operation of vehicle A/C system and reviewed vehicle log data. Found faults present for thermal system discharge and pressure sensors. Inspected vehicle wiring from sensors to thermal controller. Found all wiring intact with proper connections. Tested for proper signal, voltage, and ground to sensors. Found all within specification. Performed thermal test. System failed for pressure sensors. Replaced pressure sensors. Recharged A/C system and performed thermal test. Verified system passed and A/C system now operating as expected with no faults.

Corrections: Pressure Transducer - High Pressure
Removed and replaced refrigerant pressure sensors. Verified correct operation.

Parts Replaced or Added
Part Quantity

AC LINE ASY,LWR LIQ & CHLR, MDL S2 1(1062583-00-C)

SNSR-REFRIGERANT PRESS AND TEMP- 1HI (1008516-00-B)

Corrections: A/C Refrigerant Recovery and Recharge

Performed A/C refrigerant recharge procedure. Corrections: Thermal System Test

Performed thermal system test following replacement of pressure sensors. Found results optimal.

 

[D3xDt3Reaction]

Was plagued by symptoms just like OP in Dec. 2017 S. Tampa service was great about spending 30+ minutes driving around with the mechanic trying to reproduce but, of course, was one of the few times it didn't do it. Anyway, they ended up checking logs and repair shown below seems to have done the trick:

Concern: Customer: A/C blow warm air after a few minutes of driving.

Corrections: Cabin HVAC General Diagnosis

Tested operation of vehicle A/C system and reviewed vehicle log data. Found faults present for thermal system discharge and pressure sensors. Inspected vehicle wiring from sensors to thermal controller. Found all wiring intact with proper connections. Tested for proper signal, voltage, and ground to sensors. Found all within specification. Performed thermal test. System failed for pressure sensors. Replaced pressure sensors. Recharged A/C system and performed thermal test. Verified system passed and A/C system now operating as expected with no faults.

Corrections: Pressure Transducer - High Pressure
Removed and replaced refrigerant pressure sensors. Verified correct operation.

Parts Replaced or Added
Part Quantity

AC LINE ASY,LWR LIQ & CHLR, MDL S2 1(1062583-00-C)

SNSR-REFRIGERANT PRESS AND TEMP- 1HI (1008516-00-B)

Corrections: A/C Refrigerant Recovery and Recharge

Performed A/C refrigerant recharge procedure. Corrections: Thermal System Test

Performed thermal system test following replacement of pressure sensors. Found results optimal.

Ours had this problem:

Concern: Customer states A/C sometimes blows warm air for a few seconds after being cold while driving

Corrections: 3 Way Coolant Valve - Radiator Bypass

Diagnostics revealed faults with 3 way coolant bypass valve. Removed and replaced valve. Performed thermal system test and verified full functionality of HVAC system.

 

[Pinot.Noir]

Mine is at service for this now. We will see what they repair.

 

[Edward D]

Pinot.Noir, I had this issue today. Did Tesla solve your issue? Can you tell me how they fixed it?