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When I cross connected the negative side to assure equal current in both controllers I got a lot of 1144 errors. If you have done the cross connect and are not getting any errors it would seem that you are good to go. Cross connecting both the positive and negative sides at the PEM connector is...

I understand your journey; I found it quite a challenge to fully understand the topology and pitfalls of the fan system in the revised single motor version. The original system using two controllers, two fuses, two motors is straight forward. That circuit topology is according to standard design...

Thanks for your post references. #24 seems to be making the assumption that the controller is on the +12 side of the motor. It is not. The only devices between the +12 power source and the pins that supply +12 to the motor are fuses. One for each motor in the original two motor design. With the...

I got quite familiar with your post Think I need a new PEM fan while researching my problem. Thanks for that information. It saved me a lot of time running down connector part numbers. Specifying connectors has been a large part of my work in power electronics design. I am not a fan of the...

I have been continuing to resolve the conditions surrounding the 1144 and 1146 errors all through the summer season and have gathered some information of interest. As of now I am no longer getting errors in my car but my last revisions were recent and the true test will be next summer when...

As promised, this is what was found. The system was charged with refrigerant and checked for leaks. A slight leak was found at the service connection. The tech used a tool to loosen and re-tighten the internals of the valve and the leak stopped. This looked like the common Schrader Valve used in...

Thanks for the information it is greatly appreciated. I will let you know how the A/C service works out.

I have checked the fans and they do run when powered directly with 12 VDC. At this point I am ready to proceed with the refrigerant re-charge. The local shop will include dye so that leak checking can be done afterwards. As I understand it the oil does not leak out with the 134a refrigerant so...

I took a look at the HVAC diagnostic screen. See attached pics. The top one is while running, the bottom one was prior to starting the compressor. After running for a few minutes it slowly rose to 8.6 bar. This would seem to be the reason the fans don't run if 15 bar is required. I thought it...

Thanks for the suggestions. I will follow those leads today.

I can confirm that the Continental Extreme Contact Sport gregd mentions is a good choice. I installed them on my 2.5 Roadster this spring. They check all the boxes for me in a summer only tire. I like hard cornering and quiet ride.

The fans that pull air through the air-conditioning condenser no longer run on my 2011 Roadster. The compressor runs and the condenser coils get hot but the fans never come on. Does anyone have any suggestions to troubleshoot this. The fuse is okay and the fan blades are free to turn.

Thanks to all for the welcoming responses. Greg, I took a look at the other discussion "Think I need a new PEM fan...". Lots of interesting information. Kudos for sticking with the diagnostic process. While reading, I had a few additional thoughts. There was some talk about gold pins. They...

Finally retired from designing power electronics and battery systems for unmanned aircraft, I now have time to give attention to my Roadster. I have been driving and depending on Tesla factory service for 10 years now. The cooling fan issues and surrounding 1144 and 1146 error codes have been...