p Figure 7 - Five-way coolant valve calibration failure p Figure 10 - Model 3 with heat pump p Figure 11 - TEXA AIR2 SAN Ozone Sanitizer p Figure 8 - Five-way coolant valve stripped gear the technician to enter 'Service Mode' and prepare the system for service. As mentioned earlier, reference the latest service information before service. Regarding the heat-pump system, a recent software update to the 'Service Mode' menu provides a highly verbose view of the overall system where the technician can operate various modes and observe the refrigerant flow, temperatures, and pressures (Figure 10). Cabin air filters are a service item we perform regularly not only on Teslas but all vehicles. In addition to that, we also recommend performing an ozone sanitization treatment service using the TEXA AIR2 SAN unit (Figure 11). This is a service we sell a lot of and is highly effective. All my employees also perform this service on their own vehicles as well. p Figure 9 - High voltage information proper HV training you do so ASAP if you're going to be servicing any of these systems. The HV tab in 'Service Mode' offers quite a bit of information about the HV system (Figure 9). Always refer to the latest service information when performing service on Tesla vehicles. COMFORT SYSTEMS Tesla vehicles use either R-134a or R-1234yf for their refrigeration systems with newer vehicles utilizing a heat-pump system which brings a new level of complexity to the refrigeration loop. Performing system service on these systems will require 28 PTEN MARCH 2023 www.VehicleServicePros.com GET TRAINED Although we've touched on several areas, there's still a lot more to be aware of on these vehicles. However, service training and knowledge will go a long way in developing a higher level of awareness of Tesla vehicles. SCOTT BROWN is an ASE Master Certified L1 Technician and has over 37 years of professional service industry experience. He is an independent shop owner in Southern California and is engaged at various levels within the industry. He has a deep understanding of the challenges technicians experience at the service level and is continuously striving to move the industry forward through education and networking. Brown found Diagnostic Network (diag.net) after 22 years of service at iATN, where he is retired as company president in 2018. sbrown@vehicleservicepros.comhttp://www.diag.net http://www.VehicleServicePros.com