GMC Envoy XL transmission not pulling and heater not working, solution not found yet on GMC Envoy XL

Some GMC Envoy XL owners report experiencing transmission issues, such as the vehicle not pulling properly, which may be linked to a faulty transmission pressure switch or malfunctioning gears and linkage. Others have noted that replacing components like the shift solenoid or the automatic transmission control module (TCM, PCM) can help address gear-shifting performance problems. Additionally, some owners find that their transmission slips when warmed up, indicating a potential need for replacement. Furthermore, some GMC Envoy XL owners report heater malfunctions, often due to low coolant levels or clogs in the heater core that impede hot air flow into the cabin. Issues with the thermostat and blend door actuator may also prevent the heater from functioning correctly. It is crucial for owners facing these problems to accurately diagnose the underlying causes and seek professional assistance if the suggested solutions do not resolve the issues.