Tesla Roadster 2010 Power Limit

[gregd]

Ok, so just sitting in the garage, turn the car on (needs to be unplugged to do this), turn on the cabin fan, crank the temp to the left (cold), push the A/C button. Does the blue LED turn on? Any sound from under the hood?

Might simply be a fuse...

 

[ML Auto]

32 bar??? 3.2 bar would be more likely. That would mean you are very low on refrigerant. Too low for the compressor to turn on.

 

[EdMcConnell]

Re-did the test again, this time without being plugged in. No change. Actually says 31.8bar (around 500 psi, I think). I can hear what sounds like fan or pump near the compressor. VDS shows 1.5-1.8A pump current. Anyone have an idea which fuse(s) to check? There’s none labeled for HVAC the components on the fuse panel. Is there an inline one?

 

[X.l.r.8]

That pressure sounds excessive.

 

[ML Auto]

The high pressure limit switch usually cuts out around 450 PSI, so the compressor wont turn on above that. Is that reading after the car sits and before the A/C is turn on? If so you probably have a bad pressure switch. It's impossibe to fill the system to 500 PSI. It could get near that pressure if you have a restriction or no air flow, but that would only be when the compressor is running.

 

[iamsuperchris]

I am having a similar problem with my 2010 Sport currently. With the AC turned on, my "Prefrigerant" pressure reads 31.8 bar, exactly what @EdMcConnell's Roadster is indicating. My compressor RPM is reading 0RPM.

Another interesting thing I noticed was that the Cooling "Requested" and "Received" both indicate 0%, but I have the AC button on, a blue light shining, and the blower turned all the way up. I've attached a photo of my diagnostics screen.

In addition to all of that, when I switch to "Debug" notifications, I get this error: "HVAC: Pressure Sensor Fail".

Is there a plug or connection I can check somewhere?