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AC issues

sku100

Member
Jan 28, 2017
50
36
Kansas City
I have a 2016 AP2/MCU1 car with FSD upgrade. Many weird things have started since the FSD upgrade, including the incredible sluggishness of EVERYTHING. Most recently, as the outside temperature is increasing, the car does not blow cold air from the vents. At the SC last week: "Perform system reset and calibration over AC system and re-enable grill shutters and verify now working as designed."

Today the car was parked in the sun, windows closed, with the cooling set at 65 degrees. After lunch the inside temperature was 92 (outside temp was 50). When we got back in the car, the vents were blowing warm air, warmer than 50 degrees. I had to turn the climate control off while we were driving, because it was blowing warm air.

They told me the compressor is working normally, and the temperature sensors are working, it's just blowing the wrong temperature air.

I discussed the possibility of the MCU2 upgrade yesterday, and that was when I was told about the $500 increase in price for AP2 cars.
I paid for a functional car with FSD. This car will not be drivable this summer in its current state.

Has anyone else had anything like this happen?
Is this another phenomenon of MCU1 with FSD upgrade?
Any thoughts on how to get this fixed?
 

Takumi

Member
Aug 25, 2006
681
328
IL
You're not the only one.

I was told it was a firmware issue. That was on a 95°F outside air Canadian summer in 2018. Hasn't happened again, but it looks like they still haven't fixed the issue. FWIW, I was told to keep the cold setting at 68°F or higher.
 

agtdDelirium

Member
Jun 15, 2017
136
373
Colorado
I have a 2016 AP2/MCU2 upgrade car and noticed a couple of times recently that the car was not cooling the interior correctly, but only on preconditioning the car. These were sunny days in CO when the interior temp rose into the 90's, but the exterior temp was still in the 40's. There was hot air blowing around in the car and no cooling. This corrected as soon as I started driving. I figured it was software related and the car trying to precondition the battery which would have been cold and not preconditioning the hot interior. I've only noticed it a couple of times, but definitely something different.
 
  • Informative
Reactions: Takumi

sku100

Member
Jan 28, 2017
50
36
Kansas City
Update:
They diagnosed a bad Thermal Controller Module ($430) and replaced it. (Although they said this was an unusual problem, they had one in stock.) After that was replaced they were getting errors from the Thermal expansion valve ($70) and replaced it. They also said the LH Front Fascia Active Louver ($260) was not opening and closing properly and replaced that as well.
They offered to replace the compressor, which they thought "sounded funny". They said there was no debris in the coolant and it is cooling well, so I saw no reason to replace it yet.
I took the long way home and experienced no problems. Hopefully this fixes things for a while.

For a car I have been driving for more than 4 years and 65k miles, this ($1050) and a 12 volt battery are the only maintenance expenses I have had other than 1 set of tires. I knew I was a "beta tester" when I bought the car (even if unofficially) and I'm still waiting for FSD.
My only question now is whether to go Plaid, or stay with what I've got for a couple more years....
 
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Reactions: pilotSteve

r1200gs4ok

Active Member
Jul 17, 2019
1,345
454
Irvine
Update:
They diagnosed a bad Thermal Controller Module ($430) and replaced it. (Although they said this was an unusual problem, they had one in stock.) After that was replaced they were getting errors from the Thermal expansion valve ($70) and replaced it. They also said the LH Front Fascia Active Louver ($260) was not opening and closing properly and replaced that as well.
They offered to replace the compressor, which they thought "sounded funny". They said there was no debris in the coolant and it is cooling well, so I saw no reason to replace it yet.
I took the long way home and experienced no problems. Hopefully this fixes things for a while.

For a car I have been driving for more than 4 years and 65k miles, this ($1050) and a 12 volt battery are the only maintenance expenses I have had other than 1 set of tires. I knew I was a "beta tester" when I bought the car (even if unofficially) and I'm still waiting for FSD.
My only question now is whether to go Plaid, or stay with what I've got for a couple more years....
is your problem fixed now? mine been doing this for last 5-6 months....really noticed yesterday when it was 89F in Irvine,Ca
 

sku100

Member
Jan 28, 2017
50
36
Kansas City
ws the MCU1 the problem or did Tesla do something else
The MCU was no the problem for the AC:
Update:
They diagnosed a bad Thermal Controller Module ($430) and replaced it. (Although they said this was an unusual problem, they had one in stock.) After that was replaced they were getting errors from the Thermal expansion valve ($70) and replaced it. They also said the LH Front Fascia Active Louver ($260) was not opening and closing properly and replaced that as well.
They offered to replace the compressor, which they thought "sounded funny". They said there was no debris in the coolant and it is cooling well, so I saw no reason to replace it yet.

But, the MCU1/HW3 combination still sucks.
 

r1200gs4ok

Active Member
Jul 17, 2019
1,345
454
Irvine
The MCU was no the problem for the AC:
Update:
They diagnosed a bad Thermal Controller Module ($430) and replaced it. (Although they said this was an unusual problem, they had one in stock.) After that was replaced they were getting errors from the Thermal expansion valve ($70) and replaced it. They also said the LH Front Fascia Active Louver ($260) was not opening and closing properly and replaced that as well.
They offered to replace the compressor, which they thought "sounded funny". They said there was no debris in the coolant and it is cooling well, so I saw no reason to replace it yet.

But, the MCU1/HW3 combination still sucks.
took mine in on Monday to the new Irvine service center.....beautiful service center.....tom (the SA) told us the tech could not find anything wrong....they checked coolant, hoses for leaks and everything else that could be a problem....they went for a long ride and tried a/c with every option and it functioned properly....I got in car with tom and we tried it and sure enough we had very cold air from front and the back now....although they did nothing, when I dropped it off, was not working....Picked it up and was great....wife drove it home and called me on the cell while driving to tell me Tesla lied......they had to have done something because it was ice cold air now...in front and in back....both in auto and manual modes...so I am happy...wife's happy and tom said if we had any issues to note the time and call him and he would look at the data....
 

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