Hi folks,
So last year's annual service resulted in an over-fill of the HVAC system, followed a few months later by an HVAC overtemp (alert 1463 in the logs) during a long drive on a hot day. Had the SC re-do the fill back to the 800g called for on the car's sticker, and all was fine.
Tab forward to this year, and they again drained and re-filled the HVAC system. Claimed it was a) a normal procedure every year (really?) and b) they only pumped out 670 (I think?) or so grams of stuff, so it was a little low. No leaks during the vacuum test, so they put 800 grams back in and put the car on the charger. They now own a CAN-SR, thanks Henry! Now the fun starts.
The car had been sitting out in the sun, and the battery was about 40C. They proceeded to charge at 70 amps. An hour later, the HVAC system overtemps. The charging eventually ended an hour or so after that. I forget if they reduced the charge amps or not. Next day there's another charging session, again with the battery really hot. Another 1463 overtemp. Reduced the amps, and it finished. They claim that it shouldn't have been charged in the sun, and that everything else is fine.
I'm not convinced.
I have the car back with the battery temp in the mid-30's, with no further work done on it, and it seems to be working ok. Charged when I got home, but I only charge at 24 amps, and the ESS temp came down and ended normally with an under-30C temp, so the car had its first peaceful night's sleep in nearly a week.
All this was bugging me, remembering back to the over-charge from last year, so yesterday I caught the car doing its daily top-off charge and looked at the HVAC screen. Details below.
My question: is this running correctly? 100% requested but a lot less received? RPMs different? Pressure different?
Observation is that the requested cooling is 100%, but the system was only supplying 74% when I saw it (it had been running for a minute or two by that time). And, the % Received and RPM kept dropping until it was well under 50%, at which time the cooling request was done (0% request and receive) and the charge finished a few minutes later.
Looking back at last year's numbers, the ambient was a lot hotter, but the "Prefrigerant" pressure was over 22 bar instead of between 17 and 18. The RPM numbers were also very different; a lot higher now than last year (4k-5k vs 2.3k last year). I just caught another session, with similar results. Received peaked at around 93%, then dropped into the 60% range before stopping. RPMs this time went from 5.6k down to 4.something K before stopping. I guess the % Received correlates to the RPM, but why is the RPM dropping with a constant 100% request?
Is this just a matter of the outside temps being much more pleasant this year, vs last? And under what circumstances is an overtemp during charging acceptable and to be expected? I'm still not convinced that I have a healthy car. Thoughts?
Reference from last year:
So last year's annual service resulted in an over-fill of the HVAC system, followed a few months later by an HVAC overtemp (alert 1463 in the logs) during a long drive on a hot day. Had the SC re-do the fill back to the 800g called for on the car's sticker, and all was fine.
Tab forward to this year, and they again drained and re-filled the HVAC system. Claimed it was a) a normal procedure every year (really?) and b) they only pumped out 670 (I think?) or so grams of stuff, so it was a little low. No leaks during the vacuum test, so they put 800 grams back in and put the car on the charger. They now own a CAN-SR, thanks Henry! Now the fun starts.
The car had been sitting out in the sun, and the battery was about 40C. They proceeded to charge at 70 amps. An hour later, the HVAC system overtemps. The charging eventually ended an hour or so after that. I forget if they reduced the charge amps or not. Next day there's another charging session, again with the battery really hot. Another 1463 overtemp. Reduced the amps, and it finished. They claim that it shouldn't have been charged in the sun, and that everything else is fine.
I'm not convinced.
I have the car back with the battery temp in the mid-30's, with no further work done on it, and it seems to be working ok. Charged when I got home, but I only charge at 24 amps, and the ESS temp came down and ended normally with an under-30C temp, so the car had its first peaceful night's sleep in nearly a week.
All this was bugging me, remembering back to the over-charge from last year, so yesterday I caught the car doing its daily top-off charge and looked at the HVAC screen. Details below.
My question: is this running correctly? 100% requested but a lot less received? RPMs different? Pressure different?
Observation is that the requested cooling is 100%, but the system was only supplying 74% when I saw it (it had been running for a minute or two by that time). And, the % Received and RPM kept dropping until it was well under 50%, at which time the cooling request was done (0% request and receive) and the charge finished a few minutes later.
Looking back at last year's numbers, the ambient was a lot hotter, but the "Prefrigerant" pressure was over 22 bar instead of between 17 and 18. The RPM numbers were also very different; a lot higher now than last year (4k-5k vs 2.3k last year). I just caught another session, with similar results. Received peaked at around 93%, then dropped into the 60% range before stopping. RPMs this time went from 5.6k down to 4.something K before stopping. I guess the % Received correlates to the RPM, but why is the RPM dropping with a constant 100% request?
Is this just a matter of the outside temps being much more pleasant this year, vs last? And under what circumstances is an overtemp during charging acceptable and to be expected? I'm still not convinced that I have a healthy car. Thoughts?
Reference from last year:
