Professional automotive forum for discussion of heating, ventilation, and air conditioning maintenance and repairs. Includes discussion of refrigerants, refrigeration lubricants, system analysis and diagnostics, filtration, HVAC-specific tools & equipment, best practices, and more. This forum is for experienced automotive repair professionals only, membership required.
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| Robinair 34788 oil drain fault 09/24/2026 in the HVAC Forum Hey everyone , got a question about our Robinair 43788 . Been in service for some years now with no major problems, but recently after a recovery operation found during the automatic oil drain it didn't stop the oil draining after the normal cycle. Notice... | ||
| A/C system surge/pulsation noise on engagement 09/24/2026 in the HVAC Forum [HVAC: 08 Dodge Ram 2500 SLT 6.7L] Hey folks, I got a weird one here. Never seen this before. On initial cold start engagement of A/C Compressor, it makes a loud rattling type noise the customer calls "Grinding". It does kinda sound like a grinding nois... | ||
| Mahle R1234yf temporary o2 sensor bypass 08/13/2026 in the HVAC Forum my machine just locked it self out because it says the 02 sensor has expired. Nice heads up Mahle! Is there a work around or bypass i can do until a new sensor arrives which is 1 week out? | ||
| Liquid cooled condensers 08/11/2026 in the HVAC Forum [HVAC: 19 BMW 430i xDrive 2.0L] We recently had a 2019 BMW 430i x-drive in for a/c inoperative. The vehicle has an ICE engine, not hybrid, PHEV or EV. and uses R1234yf. The a/c system was not only empty, but was actually in a vacuum. The owner said it ha... | ||
| A/C problem, or customer expectations? 08/06/2026 in the HVAC Forum [HVAC: 08 Lexus RX400h 3.3L] Good morning, fellow techs. I am all but certain the issue isn't really an issue at all, but I'm open to suggestion. Last week was pretty much the hottest of the summer. Temps around 115. The customer wanted me to check to ma... |
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